CVE-2024-31963
📋 TL;DR
This vulnerability allows an authenticated attacker to conduct a buffer overflow attack on affected Mitel SIP phones and conference units, potentially leading to information disclosure, configuration modification, or arbitrary command execution. It affects Mitel 6800 Series, 6900 Series, 6900w Series SIP phones, and 6970 Conference Unit with specific firmware versions. Attackers must have authenticated access to exploit this flaw.
💻 Affected Systems
- Mitel 6800 Series SIP Phones
- Mitel 6900 Series SIP Phones
- Mitel 6900w Series SIP Phones
- Mitel 6970 Conference Unit
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
An authenticated attacker gains full control of the device, executes arbitrary commands, steals sensitive information, or modifies system configurations to disrupt operations.
Likely Case
An authenticated attacker exploits the buffer overflow to execute limited commands or access configuration data, potentially leading to device compromise or network pivoting.
If Mitigated
With proper network segmentation and access controls, exploitation is limited to isolated devices, minimizing broader network impact.
🎯 Exploit Status
Exploitation requires authenticated access and knowledge of buffer overflow techniques; no public proof-of-concept is currently available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Mitel advisory for specific patched versions (e.g., beyond 6.3 SP3 HF4, 6.3.3, 5.1.1 SP8)
Vendor Advisory: https://www.mitel.com/support/security-advisories/mitel-product-security-advisory-24-0006
Restart Required: Yes
Instructions:
1. Review Mitel advisory 24-0006 for patched firmware versions. 2. Download the latest firmware from Mitel support portal. 3. Apply the firmware update to all affected devices following vendor instructions. 4. Reboot devices after update to ensure changes take effect.
🔧 Temporary Workarounds
Network Segmentation
allIsolate affected SIP phones and conference units on a separate VLAN to limit attack surface and prevent lateral movement.
Access Control Restriction
allImplement strict authentication and authorization controls to limit access to device management interfaces to trusted users only.
🧯 If You Can't Patch
- Monitor network traffic to and from affected devices for unusual activity or exploitation attempts.
- Disable unnecessary services or features on the devices to reduce attack vectors.
🔍 How to Verify
Check if Vulnerable:
Check the firmware version on the device via its web interface or console; compare against affected versions listed in the Mitel advisory.Check Version:
Use the device's web interface (typically under Settings > System Information) or SSH/Telnet to run vendor-specific commands (e.g., 'show version' or similar).Verify Fix Applied:
After patching, verify the firmware version has been updated to a patched version as specified in the Mitel advisory.📡 Detection & Monitoring
Log Indicators:
- Unusual authentication attempts to device management interfaces
- Log entries indicating buffer overflow or crash events on the device
Network Indicators:
- Abnormal network traffic patterns to/from SIP phones, such as unexpected command execution or data exfiltration
SIEM Query:
Example: 'source="mitel-phone" AND (event_type="buffer_overflow" OR auth_failure_count > 5)'