Ecosyste.ms: Advisories

Security Advisories: GSA_kwCzR0hTQS12cnI4LWZwN2MtN3FncM4AAyuu

org.xwiki.platform:xwiki-platform-flamingo-theme-ui vulnerable to privilege escalation

Impact

Any user with the right to add an object on a page can execute arbitrary Groovy, Python or Velocity code in XWiki leading to full access to the XWiki installation. The root cause is improper escaping of the styles properties FlamingoThemesCode.WebHome. This page is installed by default.

Reproduction Steps

Steps to reproduce:

• As a user without script or programming rights, edit your user profile with the object editor (enable advanced mode if necessary to get access) and add an object of type "Theme Class" of "FlamingoThemesCode". In the field "body-bg" (all other fields should work, too) add the following text:

{{/html}} {{async async="true" cached="false" context="doc.reference"}}{{groovy}}println("Hello " + "from groovy!"){{/groovy}}{{/async}}

• Click "Save & View"
• Open /xwiki/bin/view/FlamingoThemesCode/WebHomeSheet where is the URL of your XWiki installation

Expected result:

The list of color themes either doesn't include the user's profile or displays a regular preview.

Actual result:

The user's profile is listed as color theme but instead of the little preview the message

Failed to execute the [html] macro. Cause: [When using HTML content inline, you can only use inline HTML content. Block HTML content (such as tables) cannot be displayed. Try leaving an empty line before and after the macro.]. Click on this message for details.
Hello from groovy!">

is displayed. This shows that a Groovy macro with content created by the user has been executed and thus demonstrates a privilege escalation from simple user account to programming rights.

Patches

The vulnerability has been patched in XWiki 13.10.11, 14.4.7 and 14.10.

Workarounds

The issue can be fixed by applying this patch on FlamingoThemesCode.WebHomeSheet.

References

• patch: https://github.com/xwiki/xwiki-platform/commit/df596f15368342236f8899ca122af8f3df0fe2e8
• Jira: https://jira.xwiki.org/browse/XWIKI-20280

For more information

If you have any questions or comments about this advisory:

• Open an issue in Jira XWiki.org
• Email us at Security Mailing List

Permalink: https://github.com/advisories/GHSA-vrr8-fp7c-7qgp
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS12cnI4LWZwN2MtN3FncM4AAyuu
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Critical
Classification: General
Published: over 1 year ago
Updated: over 1 year ago

CVSS Score: 9.9
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L

EPSS Percentage: 0.00321
EPSS Percentile: 0.70199

Identifiers: GHSA-vrr8-fp7c-7qgp, CVE-2023-30537
References:

• https://github.com/xwiki/xwiki-platform/security/advisories/GHSA-vrr8-fp7c-7qgp
• https://github.com/xwiki/xwiki-platform/commit/df596f15368342236f8899ca122af8f3df0fe2e8
• https://jira.xwiki.org/browse/XWIKI-20280
• https://nvd.nist.gov/vuln/detail/CVE-2023-30537
• https://github.com/advisories/GHSA-vrr8-fp7c-7qgp

Repository: https://github.com/xwiki/xwiki-platform
Blast Radius: 1.0

Affected Packages