CVE-2016-7489
📋 TL;DR
This vulnerability in Teradata Virtual Machine Community Edition v15.10 allows local attackers to execute arbitrary code with elevated privileges due to insecure temporary file creation in the /tmp directory by the t2a.pl Perl script. It affects systems running the vulnerable version of Teradata VM Community Edition. Attackers must have local access to exploit this flaw.
💻 Affected Systems
- Teradata Virtual Machine Community Edition
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with root privileges, allowing complete control over the Teradata environment and potentially the underlying host system.
Likely Case
Privilege escalation from a low-privileged user to root, enabling data theft, system manipulation, or persistence mechanisms.
If Mitigated
Limited impact if proper file permissions and access controls prevent unauthorized users from accessing the system or /tmp directory.
🎯 Exploit Status
Exploitation requires local access but is straightforward once access is obtained. The vulnerability is in predictable temporary file handling.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after v15.10
Vendor Advisory: https://www.teradata.com/
Restart Required: Yes
Instructions:
1. Upgrade to a version after v15.10. 2. Apply any security patches from Teradata. 3. Restart the Teradata VM services or the entire system.
🔧 Temporary Workarounds
Secure /tmp directory permissions
linuxSet restrictive permissions on /tmp directory to prevent unauthorized file manipulation
chmod 1777 /tmp
chown root:root /tmp
Remove or restrict t2a.pl script
linuxRemove execute permissions or delete the vulnerable script
chmod -x /opt/teradata/gsctools/bin/t2a.pl
rm /opt/teradata/gsctools/bin/t2a.pl
🧯 If You Can't Patch
- Implement strict access controls to limit who can log into the Teradata VM system
- Monitor /tmp directory for suspicious file creation and set up alerts for unauthorized modifications
🔍 How to Verify
Check if Vulnerable:
Check if /opt/teradata/gsctools/bin/t2a.pl exists and examine its file creation patterns in /tmpCheck Version:
tdvm version or check Teradata documentation for version informationVerify Fix Applied:
Verify the script has been updated or removed, and test that temporary files are created securely📡 Detection & Monitoring
Log Indicators:
- Unusual file creation in /tmp by perl processes
- Suspicious privilege escalation attempts
Network Indicators:
- Local privilege escalation doesn't typically generate network traffic
SIEM Query:
process_name:"perl" AND file_path:"/tmp/*" AND user_change_event