CVE-2022-26941
📋 TL;DR
A format string vulnerability in Motorola MTM5000 series firmware allows attackers to execute arbitrary code with root privileges by sending specially crafted AT commands. This affects Motorola MTM5000 series devices running vulnerable firmware versions. Attackers can achieve complete device compromise through this vulnerability.
💻 Affected Systems
- Motorola MTM5000 series
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device takeover with root privileges, allowing persistent backdoor installation, data exfiltration, and use as a pivot point in the network.
Likely Case
Remote code execution leading to device compromise, credential theft, and lateral movement within the network.
If Mitigated
Limited impact if devices are isolated from untrusted networks and AT command interfaces are disabled.
🎯 Exploit Status
Format string vulnerabilities typically require specific knowledge of memory layout but can lead to reliable exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified in provided references
Vendor Advisory: Not provided in references
Restart Required: Yes
Instructions:
1. Contact Motorola Solutions for firmware updates. 2. Apply firmware patch if available. 3. Reboot device after patching.
🔧 Temporary Workarounds
Disable AT Command Interface
allDisable or restrict access to AT command interface if not required for operations.
Configuration specific to Motorola MTM5000 - consult device documentation
Network Segmentation
allIsolate MTM5000 devices from untrusted networks and restrict access to authorized IPs only.
firewall rules to restrict access to device management interfaces
🧯 If You Can't Patch
- Implement strict network access controls to limit who can communicate with the AT command interface
- Monitor for unusual AT command traffic and implement intrusion detection for format string exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check firmware version against Motorola's security advisory. Test if AT+CTGL command accepts format string specifiers.Check Version:
Device-specific command to check firmware version (consult Motorola documentation)Verify Fix Applied:
Verify firmware version has been updated to patched version from vendor. Test that AT+CTGL command no longer processes format string specifiers.📡 Detection & Monitoring
Log Indicators:
- Unusual AT command sequences
- Multiple failed AT command attempts
- AT+CTGL commands with format string characters (%n, %s, %x, etc.)
Network Indicators:
- AT command traffic from unauthorized sources
- Unusual patterns in serial or network communication to device management ports
SIEM Query:
source_ip NOT IN (authorized_ips) AND (protocol:serial OR port:device_management) AND command:AT+CTGL