CVE-2023-2794
📋 TL;DR
CVE-2023-2794 is a stack overflow vulnerability in ofono's SMS decoding function that allows remote code execution. It affects Linux systems using ofono for telephony services. Attackers could exploit this via SMS messages, compromised modems, or malicious base stations.
💻 Affected Systems
- ofono
📦 What is this software?
Fedora by Fedoraproject
Fedora by Fedoraproject
Ofono by Ofono Project
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with root privileges leading to data theft, persistence, or device takeover
Likely Case
Remote code execution with ofono process privileges leading to service disruption or lateral movement
If Mitigated
Denial of service if exploit fails or is blocked by network controls
🎯 Exploit Status
Exploitation requires SMS delivery capability or modem access; no public exploit code known
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check distribution-specific updates
Vendor Advisory: https://bugzilla.redhat.com/show_bug.cgi?id=2255387
Restart Required: Yes
Instructions:
1. Update ofono package via distribution package manager 2. Restart ofono service or reboot system 3. Verify patch applied
🔧 Temporary Workarounds
Disable SMS processing
linuxTemporarily disable SMS message processing in ofono configuration
systemctl stop ofono
Edit /etc/ofono/*.conf to disable SMS features
Network filtering
allBlock SMS messages at network level if possible
🧯 If You Can't Patch
- Isolate affected systems from SMS-capable networks
- Implement strict network segmentation for telephony components
🔍 How to Verify
Check if Vulnerable:
Check ofono version and compare with patched versions from distribution advisoriesCheck Version:
ofonod --version 2>/dev/null || rpm -q ofono 2>/dev/null || dpkg -l | grep ofonoVerify Fix Applied:
Verify ofono package version matches patched version from vendor📡 Detection & Monitoring
Log Indicators:
- ofono crash logs
- SMS processing errors
- segmentation faults in ofono process
Network Indicators:
- Unusual SMS traffic patterns
- SMS from unexpected sources
SIEM Query:
process:ofonod AND (event:crash OR event:segfault)