CVE-2024-21673
📋 TL;DR
This is a high-severity Remote Code Execution vulnerability in Atlassian Confluence Data Center and Server that allows authenticated attackers to execute arbitrary code on affected systems. It affects Confluence versions 7.13.0 and later, putting organizations using these versions at risk of complete system compromise.
💻 Affected Systems
- Atlassian Confluence Data Center
- Atlassian Confluence Server
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system takeover with attacker gaining full control over the Confluence server, accessing sensitive data, modifying content, and using the server as a pivot point to attack other internal systems.
Likely Case
Authenticated attackers (including regular users) executing arbitrary commands to steal sensitive data, install backdoors, or disrupt Confluence availability.
If Mitigated
Limited impact due to network segmentation, strong authentication controls, and minimal user privileges, though authenticated users could still cause damage.
🎯 Exploit Status
Exploitation requires authenticated access but the technical complexity appears moderate based on CVSS scoring.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 7.19.18, 8.5.5, 8.7.2 or higher
Vendor Advisory: https://confluence.atlassian.com/security/security-bulletin-january-16-2024-1333335615.html
Restart Required: Yes
Instructions:
1. Backup your Confluence instance and database. 2. Download the appropriate fixed version from Atlassian's download center. 3. Follow Atlassian's upgrade documentation for your version. 4. Restart Confluence services after upgrade. 5. Verify the upgrade was successful.
🔧 Temporary Workarounds
Restrict user access
allLimit authenticated user access to only essential personnel while planning upgrade
🧯 If You Can't Patch
- Implement strict network segmentation to isolate Confluence servers from critical systems
- Enforce principle of least privilege for all Confluence user accounts and monitor for suspicious activity
🔍 How to Verify
Check if Vulnerable:
Check Confluence version via Administration → General Configuration → System Information, or run: grep -i 'confluence.version' confluence/WEB-INF/classes/build.propertiesCheck Version:
grep -i 'confluence.version' confluence/WEB-INF/classes/build.propertiesVerify Fix Applied:
Verify version is 7.19.18+, 8.5.5+, or 8.7.2+ using same methods as checking vulnerability📡 Detection & Monitoring
Log Indicators:
- Unusual process execution patterns
- Suspicious Java class loading
- Unexpected system command execution
Network Indicators:
- Unusual outbound connections from Confluence server
- Suspicious payloads in HTTP requests
SIEM Query:
source="confluence.log" AND ("ProcessBuilder" OR "Runtime.exec" OR suspicious command patterns)