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XWiki Platform vulnerable to privilege escalation from view right on XWiki.AttachmentSelector

Critical severity GitHub Reviewed Published Apr 18, 2023 in xwiki/xwiki-platform • Updated Nov 4, 2023

Package

maven org.xwiki.platform:xwiki-platform-attachment-ui (Maven)

Affected versions

>= 2.0-rc-2, < 13.10.11
>= 14.0-rc-1, < 14.4.8
>= 14.5, < 14.10.1

Patched versions

13.10.11
14.4.8
14.10.1

Description

Impact

Any user with view rights on XWiki.AttachmentSelector can execute arbitrary Groovy, Python or Velocity code in XWiki leading to full access to the XWiki installation. The root cause is improper escaping in the "Cancel and return to page" button. This page is installed by default.

See https://jira.xwiki.org/browse/XWIKI-20275 for the reproduction steps.

Patches

The vulnerability has been patched in XWiki 15.0-rc-1, 14.10.1, 14.4.8, and 13.10.11.

Workarounds

The issue can be fixed by applying this patch on XWiki.AttachmentSelector.

References

For more information

If you have any questions or comments about this advisory:

References

@tmortagne tmortagne published to xwiki/xwiki-platform Apr 18, 2023
Published by the National Vulnerability Database Apr 19, 2023
Published to the GitHub Advisory Database Apr 20, 2023
Reviewed Apr 20, 2023
Last updated Nov 4, 2023

Severity

Critical

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
Low

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L

EPSS score

0.191%
(57th percentile)

Weaknesses

CVE ID

CVE-2023-29516

GHSA ID

GHSA-3989-4c6x-725f

Source code

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