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Security Advisories: GSA_kwCzR0hTQS1nNGg2LXFwNDQtd3F2eM4AAu8R

XWiki.WebHome vulnerable to Improper Privilege Management in XWiki resolving groups

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

If you have any questions or comments about this advisory:

Open an issue in Jira XWiki.org
Email us at Security Mailing List

Permalink: https://github.com/advisories/GHSA-g4h6-qp44-wqvx
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS1nNGg2LXFwNDQtd3F2eM4AAu8R
Source: GitHub Advisory Database
Origin: Unspecified
Severity: High
Classification: General
Published: about 2 years ago
Updated: almost 2 years ago

CVSS Score: 8.1
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Identifiers: GHSA-g4h6-qp44-wqvx, CVE-2022-31166
References:

Repository: https://github.com/xwiki/xwiki-platform
Blast Radius: 1.0

Affected Packages

maven:org.xwiki.platform:xwiki-platform-oldcore

Affected Version Ranges: >= 14.0-rc-1, < 14.2-rc-1, >= 11.3.7, < 13.10.4
Fixed in: 14.2-rc-1, 13.10.4