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GHSA-qj4x-9g63-25g6
org.xwiki.platform/xwiki-platform-oldcoreorg.xwiki.platform/xwiki-platform-oldcoreImpact
With Jetty 12+ a user can craft a URL to access any resource the Jetty instance is allowed to access.
For example http://[host]/xwiki/bin/skin/..%252f/..%252f..%252f..%252f..%252f..%252f..%252f..%252fetc/passwd allows downloading the content of the /etc/passwd file, provided Jetty is allowed to read it, and if your XWiki webapp is located exactly 5 levels below / (like /var/lib/jetty/webapps/xwiki, which is the case in the docker image, for example).
Another example which does not go out of the XWiki webapp, but it's still a vulnerability (since users should not be allowed to access Hibernate or XWiki configuration files) is http://[host]/xwiki/bin/skin/..%252f/..%252fWEB-INF/xwiki.cfg.
Patches
This vulnerability has been patched in XWiki 17.10.5 and 18.2.0.
Workarounds
A possible workaround is to use a different application server, like Jetty < 12 (in the case of XWiki < 17) or Tomcat, which don't seem to be impacted.
Resources
- https://jira.xwiki.org/browse/XWIKI-24075
- https://jira.xwiki.org/browse/XCOMMONS-3594
For more information
If there are any questions or comments about this advisory:
- Open an issue in Jira XWiki.org
- Send an email to the Security Mailing List
Attribution
Lê Ngọc Khoa reported the vulnerability.
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The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability.
Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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