CVE-2023-29209
📋 TL;DR
CVE-2023-29209 is a critical remote code execution vulnerability in XWiki Commons that allows authenticated users with view rights to execute arbitrary Groovy, Python, or Velocity code via improperly escaped macro parameters in the legacy notification activity macro. This leads to full compromise of the XWiki installation. All XWiki instances with the default macro configuration are affected.
💻 Affected Systems
- XWiki Commons
- XWiki Platform
📦 What is this software?
Xwiki by Xwiki
Xwiki by Xwiki
Xwiki by Xwiki
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise allowing attacker to execute arbitrary code, access/modify all data, install backdoors, and pivot to other systems.
Likely Case
Privilege escalation to administrative access, data exfiltration, and installation of persistent web shells.
If Mitigated
Limited impact if proper network segmentation and least privilege access controls are implemented, though code execution would still be possible.
🎯 Exploit Status
Exploitation requires authenticated access with view rights. Public proof-of-concept exists in advisory references. The vulnerability is straightforward to exploit once authenticated.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: XWiki 13.10.11, 14.4.7, or 14.10
Vendor Advisory: https://github.com/xwiki/xwiki-platform/security/advisories/GHSA-9pc2-x9qf-7j2q
Restart Required: Yes
Instructions:
1. Identify your XWiki version. 2. Upgrade to XWiki 13.10.11, 14.4.7, or 14.10 depending on your current major version. 3. Restart the XWiki application server. 4. Verify the patch is applied by checking the version.
🔧 Temporary Workarounds
Disable legacy notification activity macro
allRemove or disable the vulnerable macro to prevent exploitation
Navigate to XWiki Administration > Content > Macros > Legacy notification activity macro and disable it
Restrict user permissions
allTemporarily restrict view/edit permissions on wiki pages
Modify page permissions in XWiki to limit access to trusted users only
🧯 If You Can't Patch
- Implement strict network access controls to limit XWiki access to trusted users only
- Enable detailed logging and monitoring for suspicious macro execution or code injection attempts
🔍 How to Verify
Check if Vulnerable:
Check if your XWiki version is below 13.10.11, 14.4.7, or 14.10 and if the legacy notification activity macro is enabled.Check Version:
Check XWiki footer or Administration dashboard for version informationVerify Fix Applied:
Verify XWiki version is 13.10.11, 14.4.7, or 14.10 or higher. Test that macro parameter injection no longer executes arbitrary code.📡 Detection & Monitoring
Log Indicators:
- Unusual Groovy/Python/Velocity code execution in macro contexts
- Suspicious activity from user accounts with view-only permissions
- Multiple failed macro execution attempts
Network Indicators:
- Unusual outbound connections from XWiki server
- Traffic patterns indicating data exfiltration
SIEM Query:
source="xwiki.log" AND ("Groovy execution" OR "Python execution" OR "Velocity execution") AND "notification activity macro"🔗 References
- https://github.com/xwiki/xwiki-platform/commit/94392490884635c028199275db059a4f471e57bc
- https://github.com/xwiki/xwiki-platform/security/advisories/GHSA-9pc2-x9qf-7j2q
- https://jira.xwiki.org/browse/XWIKI-20258
- https://github.com/xwiki/xwiki-platform/commit/94392490884635c028199275db059a4f471e57bc
- https://github.com/xwiki/xwiki-platform/security/advisories/GHSA-9pc2-x9qf-7j2q
- https://jira.xwiki.org/browse/XWIKI-20258
