CVE-2013-7089
📋 TL;DR
CVE-2013-7089 is an information disclosure vulnerability in ClamAV's dbg_printhex function that could leak sensitive memory contents. This affects ClamAV antivirus software versions before 0.97.7. Organizations using vulnerable ClamAV versions for email scanning, file scanning, or web content filtering are potentially affected.
💻 Affected Systems
- ClamAV
📦 What is this software?
Clamav by Clamav
Fedora by Fedoraproject
Fedora by Fedoraproject
⚠️ Risk & Real-World Impact
Worst Case
An attacker could exploit this to read sensitive memory contents, potentially exposing passwords, encryption keys, or other confidential data from the ClamAV process memory space.
Likely Case
Information disclosure of limited memory contents, potentially revealing some system information or partial data from scanned files.
If Mitigated
With proper network segmentation and access controls, the impact is limited to potential information leakage rather than system compromise.
🎯 Exploit Status
Exploitation details were publicly disclosed in security advisories. The vulnerability requires triggering specific debug conditions in ClamAV.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 0.97.7 and later
Vendor Advisory: https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2013-7089
Restart Required: Yes
Instructions:
1. Update ClamAV to version 0.97.7 or later using your distribution's package manager. 2. For source installations: download latest version from clamav.net, compile and install. 3. Restart all ClamAV services and daemons.
🔧 Temporary Workarounds
Disable debug functionality
allDisable or restrict debug output in ClamAV configuration to prevent triggering the vulnerable function
Edit clamd.conf and set Debug to 0
Ensure no debug logging is enabled in configuration files
Network isolation
allRestrict network access to ClamAV services to trusted networks only
Configure firewall rules to limit access to ClamAV ports (default 3310)
🧯 If You Can't Patch
- Isolate ClamAV services in a segmented network zone with limited access
- Implement strict access controls and monitoring for ClamAV services
🔍 How to Verify
Check if Vulnerable:
Run 'clamscan --version' or 'clamd --version' and check if version is below 0.97.7Check Version:
clamscan --version | head -1Verify Fix Applied:
Verify version is 0.97.7 or higher with 'clamscan --version' and check that ClamAV services are running properly📡 Detection & Monitoring
Log Indicators:
- Unusual debug output in ClamAV logs
- Memory access errors or segmentation faults in system logs
Network Indicators:
- Unexpected connections to ClamAV daemon ports
- Unusual traffic patterns to/from ClamAV services
SIEM Query:
source="clamav" AND (event_type="error" OR event_type="debug") AND message="*dbg_printhex*"🔗 References
- http://security.gentoo.org/glsa/glsa-201405-08.xml
- http://www.openwall.com/lists/oss-security/2013/12/13/1
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2013-7089
- https://security-tracker.debian.org/tracker/CVE-2013-7089
- http://security.gentoo.org/glsa/glsa-201405-08.xml
- http://www.openwall.com/lists/oss-security/2013/12/13/1
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2013-7089
- https://security-tracker.debian.org/tracker/CVE-2013-7089
