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Users can be created even when registration is disabled without validation via the template macro

Moderate
tmortagne published GHSA-fp36-mjw5-fmgx Apr 18, 2023

Package

maven org.xwiki.platform:xwiki-platform-web-templates (Maven)

Affected versions

>= 8.0-rc-1

Patched versions

15.0-rc-1, 14.10.1

Description

Impact

If guest has view right on any document. It's possible to create a new user using the distribution/firstadminuser.wiki in the wrong context.

To reproduce:

  • On a wiki with view rights for guests but user registration disabled, open as guest /xwiki/bin/view/Main?sheet=CKEditor.HTMLConverter&language=en&sourceSyntax=xwiki%2F2.1&stripHTMLEnvelope=true&fromHTML=false&toHTML=true&text=%7B%7Btemplate+name%3D%22distribution%2Ffirstadminuser.wiki%22+%2F%7D%7D where is the URL of your XWiki installation.
  • Enter username and password of your choice.
  • Click "Register and login"

Starting with XWiki 14.5 (or CKEditor contrib extension 1.64.3) you need to include a valid CSRF token.

Patches

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

Workarounds

There is no known workaround other than upgrading.

References

https://jira.xwiki.org/browse/XWIKI-19852
https://jira.xwiki.org/browse/XWIKI-20400

For more information

If you have any questions or comments about this advisory:

Severity

Moderate

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
None
Integrity
Low
Availability
None

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:N/I:L/A:N

CVE ID

CVE-2023-29513

Weaknesses