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GHSA-987p-r3jc-8c8v
No affected components available
Impact
The Solr script service that is accessible in XWiki's scripting API normally requires programming right to be called. Due to using the wrong API for checking rights, it doesn't take the fact into account that programming rights might have been dropped by calling $xcontext.dropPermissions(). If some code relies on this for the safety of executing Velocity code with the wrong author context, this could allow a user with script right to either cause a high load by indexing documents or to temporarily remove documents from the search index. We're not aware that this is exploitable in XWiki itself.
To reproduce, a user with programming right can add the following XWiki syntax to a page:
{{velocity}}
$xcontext.dropPermissions()
$services.solr.index('document:xwiki:Main.WebHome')
{{/velocity}}
This should trigger an error in XWiki's log, otherwise the installation is vulnerable.
Patches
This has been patched in XWiki 15.10.13, 16.8.0RC1, and 16.4.4.
Workarounds
We're not aware of any workarounds apart from being careful whom you grant script right.
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 low impact on the integrity of the data. There is a low impact on the availability of the system.
Limited exploitation activity has been observed. Close monitoring and planned remediation are recommended.
Probability that this vulnerability will be exploited in the wild within the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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