Impact
It's possible for an user to get access to private information through the REST API - but could also be through another API - when a sub wiki is using "Prevent unregistered users to view pages". The vulnerability only affects subwikis, and it only concerns specific right options such as "Prevent unregistered users to view pages". or "Prevent unregistered users to edit pages".
It's possible to detect the vulnerability by enabling "Prevent unregistered users to view pages" and then trying to access a page through the REST API without using any credentials.
Patches
The vulnerability has been patched in XWiki 15.10.14, 16.4.6 and 16.10.0RC1.
Workarounds
There's no workaround.
References
JIRA ticket: https://jira.xwiki.org/browse/XWIKI-22640 Commit of the fix: https://github.com/xwiki/xwiki-platform/commit/5f98bde87288326cf5787604e2bb87836875ed0e
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
Impact
Protected pages are listed when requesting the REST endpoints /rest/wikis/[wikiName]/pages even if the user doesn't have view rights on them. It's particularly true if the entire wiki is protected with "Prevent unregistered user to view pages": the endpoint would still list the pages of the wiki (actually it only impacts the main wiki due to XWIKI-22639).
Patches
The problem has been patched in XWiki 15.10.14, 16.4.6, 16.10.0RC1. In those versions the endpoint can still be requested but the result is filtered out based on pages rights.
Workarounds
There's no workaround except upgrading or applying manually the changes of the commits (see references) in xwiki-platform-rest-server and recompiling / rebuilding it.
References
Original JIRA ticket: https://jira.xwiki.org/browse/XWIKI-22630 Related JIRA ticket: https://jira.xwiki.org/browse/XWIKI-22639 Commits of the patch: https://github.com/xwiki/xwiki-platform/commit/bca72f5ce971a31dba2a016d8dd8badda4475206 and https://github.com/xwiki/xwiki-platform/commit/1fb12d2780f37b34a1b4dfdf8457d97ce5cbb2df
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