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XWiki Platform: Privilege escalation (PR) from user registration through PDFClass

Critical severity GitHub Reviewed Published Apr 10, 2024 in xwiki/xwiki-platform • Updated Apr 10, 2024

Package

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

Affected versions

>= 3.0.1, < 14.10.20
>= 15.0-rc-1, < 15.5.4
>= 15.6-rc-1, < 15.10-rc-1

Patched versions

14.10.20
15.5.4
15.10-rc-1

Description

Impact

Remote code execution is possible via PDF export templates.
To reproduce on an installation, register a new user account with username PDFClass if XWiki.PDFClass does not exist.
On XWiki.PDFClass, use the class editor to add a "style" property of type "TextArea" and content type "Plain Text".
Then, add an object of class PDFClass and set the "style" attribute to $services.logging.getLogger('PDFClass').error("I got programming: $services.security.authorization.hasAccess('programming')").
Finally, go to <host>/xwiki/bin/export/Main/WebHome?format=pdf&pdftemplate=XWiki.PDFClass. If the logs contain "ERROR PDFClass - I got programming: true", the instance is vulnerable.

Patches

This vulnerability has been patched in XWiki 14.10.20, 15.5.4 and 15.10-rc-1.

Workarounds

If PDF templates are not typically used on the instance, an administrator can create the document XWiki.PDFClass and block its edition, after making sure that it does not contain a style attribute.
Otherwise, the instance needs to be updated.

References

References

@surli surli published to xwiki/xwiki-platform Apr 10, 2024
Published to the GitHub Advisory Database Apr 10, 2024
Reviewed Apr 10, 2024
Published by the National Vulnerability Database Apr 10, 2024
Last updated Apr 10, 2024

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
High

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:H

EPSS score

0.045%
(17th percentile)

Weaknesses

CVE ID

CVE-2024-31981

GHSA ID

GHSA-vxwr-wpjv-qjq7

Source code

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