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GHSA-g4h6-qp44-wqvx

HighCVSS 8.1 / 10
Published Sep 20, 2022·Last modified Nov 8, 2023
Affected Components(0)

No affected components available

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

  • https://jira.xwiki.org/browse/XWIKI-18386
  • https://jira.xwiki.org/browse/XWIKI-15776

For more information

If you have any questions or comments about this advisory:

Risk Scores
Base Score
8.1

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 impact is confined to the system where the vulnerability exists. There is a high impact on the confidentiality of the information. There is a high impact on the integrity of the data.

Threat Intelligence
7.4

Exploitation activity has been observed. Apply available patches or mitigations urgently.

EPSS
N/A

Probability that this vulnerability will be exploited in the wild within the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

Related Vulnerabilities
  • CVE-2022-31166
    Alias
  • EUVD-2022-6817
    Alias

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High severity
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