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Improper Privilege Management in XWiki resolving groups in XWiki.WebHome

High
surli published GHSA-g4h6-qp44-wqvx Sep 7, 2022

Package

maven org.xwiki.platform:xwiki-platform-oldcore (Maven)

Affected versions

>= 11.3.7, >= 12.0RC1, >= 11.10.3

Patched versions

13.10.4, 14.2RC1

Description

Impact

It's possible to exploit a bug in XWikiRights resolution of groups to obtain privilege escalation.

More specifically, editing a right with the object editor leads to adding a supplementary empty value to groups which is then resolved as a reference to XWiki.WebHome page. Adding an XWikiGroup xobject to that page then transforms it to a group, any user put in that group would then obtain the privileges related to the edited right.

Note that this security issue is normally mitigated by the fact that XWiki.WebHome (and XWiki space in general) should be protected by default for edit rights.

Patches

The problem has been patched in XWiki 13.10.4 and 14.2RC1 to not consider anymore empty values in XWikiRights.

Workarounds

It's possible to workaround the problem by setting appropriate rights on XWiki.WebHome page to prevent users to edit it.

References

For more information

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Severity

High
8.1
/ 10

CVSS base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

CVE ID

CVE-2022-31166

Weaknesses