XWiki Platform has an Unauthenticated XAR Import via REST /wikis/{wikiName}

Impact

POST /wikis/{wikiName} executes a XAR import without performing any authentication or authorization checks, allowing an unauthenticated attacker to create or update documents in the target wiki

Patches

This vulnerability has been patched in XWiki 16.10.17, 17.4.9, 17.10.3, 18.0.1 and 18.1.0-rc-1.

Workarounds

XWiki is not aware of any workarounds other than adding a rule into an HTTP proxy to prevent access POST request in the /wikis/{wikiName}[/] endpoint.

Resources

• https://jira.xwiki.org/browse/XWIKI-23953
• https://github.com/xwiki/xwiki-platform/commit/4b7b95b79256374d487e9ece1dc48f527966990f

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

Reported by Sho Odagiri (GMO Cybersecurity by Ierae, Inc.).