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GHSA-m2r5-4w96-qxg5
No affected components available
Impact
It's possible in a script to access any file accessing to the user running XWiki application server with XML External Entity Injection through the XML script service.
For example:
{{velocity}}
#set($xml=$services.get('xml'))
#set($xxe_payload = "<?xml version='1.0' encoding='UTF-8'?><!DOCTYPE root[<!ENTITY xxe SYSTEM 'file:///etc/passwd' >]><root><foo>&xxe;</foo></root>")
#set($doc=$xml.parse($xxe_payload))
$xml.serialize($doc)
{{/velocity}}
Patches
The problem has been patched on versions 12.10.10, 13.4.4 and 13.8RC1.
Workarounds
There's no easy workaround for fixing this vulnerability other than upgrading and being careful when giving Script rights.
References
https://jira.xwiki.org/browse/XWIKI-18946
For more information
If you have any questions or comments about this advisory:
- Open an issue in Jira XWiki
- Email us at XWiki Security mailing-list
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs high-level or administrative privileges. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the confidentiality of the information.
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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