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Privilege escalation (PR) from account through TipsPanel

Critical
tmortagne published GHSA-h7cw-44vp-jq7h Jun 20, 2023

Package

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

Affected versions

8.1-milestone-1

Patched versions

15.1-rc-1, 14.10.5

Description

Impact

It's possible to execute any wiki content with the right of the TipsPanel author by creating a tip UI extension.

To reproduce:

  • Add an object of type UIExtensionClass
  • Set "Extension Point ID" to org.xwiki.platform.help.tipsPanel
  • Set "Extension ID" to org.xwiki.platform.user.test (needs to be unique but otherwise doesn't matter)
  • Set "Extension Parameters" to 
    tip={{async async="true" cached="false" context="doc.reference"}}{{groovy}}println("Hello " + "from groovy!"){{/groovy}}{{/async}}
  • Set "Extension Scope" to "Current User".
  • Click "Save & View"
  • Open the "Help.TipsPanel" document at /xwiki/bin/view/Help/TipsPanel where is the URL of your XWiki installation and press refresh repeatedly.

The groovy macro is executed, after the fix you get an error instead.

Patches

This has been patched in XWiki 15.1-rc-1 and 14.10.5.

Workarounds

There are no known workarounds for it.

References

For more information

If you have any questions or comments about this advisory:

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

CVE ID

CVE-2023-35166

Weaknesses

Incorrect Authorization

The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. This allows attackers to bypass intended access restrictions. Learn more on MITRE.