CVE-2024-31987: XWiki Platform remote code execution from account via custom skins support
First published: Wed Apr 10 2024(Updated: )
### 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)
Credit: security-advisories@github.com security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| maven/org.xwiki.platform:xwiki-platform-oldcore | >=15.6-rc-1<15.10-rc-1 | 15.10-rc-1 |
| maven/org.xwiki.platform:xwiki-platform-oldcore | >=15.0-rc-1<15.5.4 | 15.5.4 |
| maven/org.xwiki.platform:xwiki-platform-oldcore | >=6.4-milestone-1<14.10.19 | 14.10.19 |
| Xwiki | >=6.4<14.10.19 | |
| Xwiki | >=15.0<15.5.4 | |
| Xwiki | >=15.6<15.10 |
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Reference Links
- 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 (Advisory)
Frequently Asked Questions
What is the severity of CVE-2024-31987?
CVE-2024-31987 has a high severity level due to its potential for remote code execution via template overrides.
How do I fix CVE-2024-31987?
To fix CVE-2024-31987, upgrade to XWiki versions 15.10-rc-1, 15.5.4, or 14.10.19 as they contain the necessary patches.
What software is affected by CVE-2024-31987?
CVE-2024-31987 affects multiple versions of XWiki, specifically those between 6.4 and 15.10.
Can any user exploit CVE-2024-31987?
Yes, any user with page editing capabilities can exploit CVE-2024-31987 to create a custom skin that triggers remote code execution.
What kind of vulnerability is CVE-2024-31987?
CVE-2024-31987 is classified as a remote code execution vulnerability due to improper handling of template overrides.
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