CVE-2020-7034
📋 TL;DR
This CVE describes a command injection vulnerability in Avaya Session Border Controller for Enterprise that allows authenticated remote attackers to execute arbitrary commands with system privileges. The vulnerability affects versions 7.x and 8.0 through 8.1.1.x. Attackers can exploit this by sending specially crafted messages to the vulnerable system.
💻 Affected Systems
- Avaya Session Border Controller for Enterprise
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise allowing attackers to execute arbitrary commands with system privileges, potentially leading to data theft, lateral movement, or complete system takeover.
Likely Case
Attackers gaining shell access to execute commands, potentially installing backdoors, modifying configurations, or disrupting services.
If Mitigated
Limited impact due to network segmentation, strong authentication controls, and monitoring preventing successful exploitation.
🎯 Exploit Status
Exploitation requires authenticated access and knowledge of the vulnerable interface. No public exploit code is known at this time.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 8.1.2 or later
Vendor Advisory: https://downloads.avaya.com/css/P8/documents/101075451
Restart Required: Yes
Instructions:
1. Download the patch from Avaya support portal. 2. Backup current configuration. 3. Apply the patch following Avaya's upgrade procedures. 4. Restart the system. 5. Verify the patch is applied successfully.
🔧 Temporary Workarounds
Network Segmentation
allRestrict access to Avaya SBC management interfaces to trusted networks only.
Configure firewall rules to limit access to Avaya SBC management ports from authorized IP addresses only.
Authentication Hardening
allImplement strong authentication mechanisms and limit user privileges.
Enable multi-factor authentication if supported. Implement least privilege access controls for all user accounts.
🧯 If You Can't Patch
- Implement strict network segmentation to isolate Avaya SBC from untrusted networks.
- Enable comprehensive logging and monitoring for suspicious command execution attempts.
🔍 How to Verify
Check if Vulnerable:
Check the Avaya SBC version via the web interface or CLI. If version is 7.x or 8.0 through 8.1.1.x, the system is vulnerable.Check Version:
show version (via CLI) or check System Information in web interfaceVerify Fix Applied:
Verify the system is running version 8.1.2 or later. Check patch status in the Avaya management interface.📡 Detection & Monitoring
Log Indicators:
- Unusual command execution patterns
- Multiple failed authentication attempts followed by successful login
- Suspicious process creation
Network Indicators:
- Unusual traffic patterns to/from Avaya SBC management interfaces
- Unexpected outbound connections from Avaya SBC
SIEM Query:
source="avaya_sbc" AND (event_type="command_execution" OR process_name="suspicious")