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GHSA-4v38-964c-xjmw
No affected components available
Impact
In XWiki, every user can add translations that are only applied to the current user. This also allows overriding existing translations. Such translations are often included in privileged contexts without any escaping which allows remote code execution for any user who has edit access on at least one document which could be the user's own profile where edit access is enabled by default.
The following describes a proof of concept exploit to demonstrate this vulnerability:
- Edit the user profile with the wiki editor and set the content to
error={{/html}} {{async async="true" cached="false" context="doc.reference"}}{{groovy}}println("hello from groovy!"){{/groovy}}{{/async}}
- Use the object editor to add an object of type
XWiki.TranslationDocumentClasswith scopeUSER. - Open the document
WikiManager.AdminWikiDescriptorSheet.
The expected result would be that a message with title {{/html}} {{async async="true" cached="false" context="doc.reference"}}{{groovy}}println("hello from groovy!"){{/groovy}}{{/async}} is displayed while in fact an error that the HTML macro couldn't be executed is displayed, followed by the text "hello from groovy!" and some raw HTML, showing that the Groovy macro has been executed.
Patches
A mitigation for this vulnerability is part of XWiki 14.10.2 and XWiki 15.0 RC1: translations with user scope now require script right. This means that regular users cannot exploit this anymore as users don't have script right by default anymore starting with XWiki 14.10.
Workarounds
There are no known workarounds apart from upgrading to a patched versions.
References
- https://jira.xwiki.org/browse/XWIKI-19749
- https://github.com/xwiki/xwiki-platform/commit/d06ff8a58480abc7f63eb1d4b8b366024d990643
For more information
If you have any questions or comments about this advisory:
- Open an issue in Jira XWiki.org
- Email us at 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 basic access or low-level privileges. No user interaction is needed for the attacker to exploit this vulnerability. The vulnerability can affect other systems as well, not just the initial system. There is a high impact on the confidentiality of the information. There is a high impact on the integrity of the data. There is a high impact on the availability of the system.
Active exploitation in the wild has been confirmed. Immediate patching or mitigation is required.
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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