CVE-2023-27479
📋 TL;DR
CVE-2023-27479 is a critical remote code execution vulnerability in XWiki Platform where any user with view rights can execute arbitrary Groovy, Python, or Velocity code due to improper escaping of UIX parameters. This allows attackers to gain full administrative access to the XWiki installation. All XWiki installations with affected versions are vulnerable.
💻 Affected Systems
- XWiki Platform
📦 What is this software?
Xwiki by Xwiki
Xwiki by Xwiki
Xwiki by Xwiki
Xwiki by Xwiki
Xwiki by Xwiki
Xwiki by Xwiki
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the XWiki installation, allowing attackers to execute arbitrary code, access/modify all data, create backdoors, and potentially pivot to other systems.
Likely Case
Attackers with basic user accounts gain administrative privileges and execute arbitrary code to steal sensitive data, modify content, or disrupt operations.
If Mitigated
With proper network segmentation and least privilege access, impact could be limited to the XWiki instance itself.
🎯 Exploit Status
Exploit requires authenticated user with view rights. Proof of concept is publicly available in the advisory.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: XWiki 13.10.11, 14.4.7, or 14.10-rc-1 and later
Vendor Advisory: https://github.com/xwiki/xwiki-platform/security/advisories/GHSA-qxjg-jhgw-qhrv
Restart Required: Yes
Instructions:
1. Backup your XWiki installation. 2. Upgrade to XWiki 13.10.11, 14.4.7, or 14.10-rc-1 or later. 3. Restart the XWiki service. 4. Verify the fix by checking the version and testing the exploit.
🔧 Temporary Workarounds
Manual patch application
allApply the same modifications as shown in commit 6de5442f3c to the PanelsCode.ApplicationsPanelConfigurationSheet wiki page
Edit the PanelsCode.ApplicationsPanelConfigurationSheet wiki page and apply the escaping fixes from commit 6de5442f3c
🧯 If You Can't Patch
- Restrict user view rights to only trusted administrators
- Implement network segmentation to isolate XWiki from critical systems
🔍 How to Verify
Check if Vulnerable:
Log in as a user with view rights, add the XWiki.UIExtensionClass xobject with the exploit payload to user profile, then navigate to /xwiki/bin/view/PanelsCode/ApplicationsPanelConfigurationSheet. If 'Hello from groovy!' appears, the system is vulnerable.Check Version:
Check XWiki version in administration panel or via xwiki.cfg fileVerify Fix Applied:
After patching, repeat the vulnerability check. The Groovy script should not execute and no code output should appear.📡 Detection & Monitoring
Log Indicators:
- Unusual Groovy/Python/Velocity code execution in logs
- Modifications to PanelsCode.ApplicationsPanelConfigurationSheet
- Unauthorized access to administrative functions
Network Indicators:
- Requests to /xwiki/bin/view/PanelsCode/ApplicationsPanelConfigurationSheet with suspicious parameters
- Unusual outbound connections from XWiki server
SIEM Query:
source="xwiki.log" AND ("groovy" OR "python" OR "velocity") AND "execution"🔗 References
- https://github.com/xwiki/xwiki-platform/commit/6de5442f3c91c3634a66c7b458d5b142e1c2a2dc
- https://github.com/xwiki/xwiki-platform/security/advisories/GHSA-qxjg-jhgw-qhrv
- https://jira.xwiki.org/browse/XWIKI-20294
- https://github.com/xwiki/xwiki-platform/commit/6de5442f3c91c3634a66c7b458d5b142e1c2a2dc
- https://github.com/xwiki/xwiki-platform/security/advisories/GHSA-qxjg-jhgw-qhrv
- https://jira.xwiki.org/browse/XWIKI-20294
