Ecosyste.ms: Advisories

Security Advisories: GSA_kwCzR0hTQS1jdjU1LXY2cnctN3I1ds4AA63u

XWiki Platform remote code execution from account via custom skins support

Impact

Any user who can edit any page like their profile can create a custom skin with a template override that is executed with programming right, thus allowing remote code execution.

To reproduce, as a user without edit, script or admin right, add an object of class XWiki.XWikiSkins to your profile. Name it whatever you want and set the Base Skin to flamingo.
Add an object of class XWikiSkinFileOverrideClass and set the path to macros.vm and the content to:

#macro(mediumUserAvatar $username)
  #resizedUserAvatar($username 50)
  $services.logging.getLogger('Skin').error("I got programming: $services.security.authorization.hasAccess('programming')")
#end

Back to your profile, click Test this skin. Force a refresh, just in case.
If the error "Skin - I got programming: true" gets logged, the installation is vulnerable.

Patches

This has been patched in XWiki 14.10.19, 15.5.4 and 15.10RC1.

Workarounds

We're not aware of any workaround except upgrading.

References

• https://jira.xwiki.org/browse/XWIKI-21478
• https://github.com/xwiki/xwiki-platform/commit/3d4dbb41f52d1a6e39835cfb1695ca6668605a39 (>= 15.8 RC1)
• https://github.com/xwiki/xwiki-platform/commit/da177c3c972e797d92c1a31e278f946012c41b56 (< 15.8 RC1)

Permalink: https://github.com/advisories/GHSA-cv55-v6rw-7r5v
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS1jdjU1LXY2cnctN3I1ds4AA63u
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Critical
Classification: General
Published: 22 days ago
Updated: 22 days ago

CVSS Score: 10.0
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Identifiers: GHSA-cv55-v6rw-7r5v, CVE-2024-31987
References:

• https://github.com/xwiki/xwiki-platform/security/advisories/GHSA-cv55-v6rw-7r5v
• https://github.com/xwiki/xwiki-platform/commit/3d4dbb41f52d1a6e39835cfb1695ca6668605a39
• https://github.com/xwiki/xwiki-platform/commit/626d2a5dbf95b4e719ae13bf1a0a9c76e4edd5a2
• https://github.com/xwiki/xwiki-platform/commit/da177c3c972e797d92c1a31e278f946012c41b56
• https://jira.xwiki.org/browse/XWIKI-21478
• https://nvd.nist.gov/vuln/detail/CVE-2024-31987
• https://github.com/advisories/GHSA-cv55-v6rw-7r5v

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

Affected Packages