CVE-2023-31871
📋 TL;DR
CVE-2023-31871 is a privilege escalation vulnerability in OpenText Documentum Content Server where a non-privileged user can exploit the dm_secure_writer SUID binary to write arbitrary files as root. This allows attackers to gain full system control. All Documentum Content Server installations before version 23.2 are affected.
💻 Affected Systems
- OpenText Documentum Content Server
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with root access, allowing installation of persistent backdoors, data theft, and lateral movement across the network.
Likely Case
Privilege escalation from Documentum user to root, enabling attackers to modify system files, install malware, or access sensitive data.
If Mitigated
Limited impact if proper access controls restrict Documentum user accounts and file system permissions are hardened.
🎯 Exploit Status
Exploit requires Documentum user credentials and careful bypass of file creation controls. Public proof-of-concept demonstrates the technique.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 23.2 and later
Vendor Advisory: https://www.opentext.com/support/security-advisories
Restart Required: Yes
Instructions:
1. Upgrade Documentum Content Server to version 23.2 or later. 2. Apply all security patches from OpenText. 3. Restart the Documentum services after upgrade.
🔧 Temporary Workarounds
Remove SUID bit from dm_secure_writer
linuxRemove the SUID permission from the vulnerable binary to prevent privilege escalation.
chmod u-s /path/to/dm_secure_writer
Restrict Documentum user permissions
allLimit Documentum user accounts to minimal necessary privileges and monitor for suspicious activity.
🧯 If You Can't Patch
- Implement strict access controls on Documentum user accounts and monitor for privilege escalation attempts.
- Use file integrity monitoring to detect unauthorized modifications to system files by Documentum processes.
🔍 How to Verify
Check if Vulnerable:
Check if dm_secure_writer binary has SUID bit set: ls -la /path/to/dm_secure_writer | grep 'rws'Check Version:
Check Documentum release notes or configuration files for version information.Verify Fix Applied:
Verify Documentum version is 23.2 or later and dm_secure_writer no longer has SUID permissions.📡 Detection & Monitoring
Log Indicators:
- Unusual file writes by Documentum processes
- Privilege escalation attempts in system logs
- Execution of dm_secure_writer with suspicious parameters
Network Indicators:
- Unusual outbound connections from Documentum server after privilege escalation
SIEM Query:
Process execution: dm_secure_writer AND (File creation OR Privilege change)