CVE-2023-4234
📋 TL;DR
CVE-2023-4234 is a stack overflow vulnerability in ofono's SMS decoding function that allows remote code execution. Attackers can exploit this via SMS messages, compromised modems, or malicious base stations. Linux systems using ofono for telephony services are affected.
💻 Affected Systems
- ofono
📦 What is this software?
Fedora by Fedoraproject
Fedora by Fedoraproject
Fedora by Fedoraproject
Ofono by Ofono Project
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to full system compromise, privilege escalation, and persistent backdoor installation
Likely Case
Service disruption, denial of service, or limited code execution within ofono context
If Mitigated
Contained impact with proper network segmentation and SMS filtering
🎯 Exploit Status
Exploitation requires sending specially crafted SMS messages or compromising modem/base station
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check distribution-specific updates (Fedora, RHEL, etc.)
Vendor Advisory: https://bugzilla.redhat.com/show_bug.cgi?id=2255399
Restart Required: Yes
Instructions:
1. Check your distribution's security advisories 2. Update ofono package via package manager 3. Restart ofono service or reboot system
🔧 Temporary Workarounds
Disable SMS functionality
linuxTemporarily disable SMS processing in ofono if not required
systemctl stop ofono
systemctl disable ofono
Network segmentation
allIsolate telephony systems from critical networks
🧯 If You Can't Patch
- Implement SMS filtering/gateway to block malicious SMS messages
- Isolate affected systems in network segments with strict firewall rules
🔍 How to Verify
Check if Vulnerable:
Check ofono version: ofonod --version or rpm -q ofonoCheck Version:
ofonod --version 2>/dev/null || rpm -q ofono 2>/dev/null || dpkg -l | grep ofonoVerify Fix Applied:
Verify updated package version and restart ofono service📡 Detection & Monitoring
Log Indicators:
- ofono crash logs
- segmentation faults in system logs
- unusual SMS processing errors
Network Indicators:
- Unusual SMS traffic patterns
- SMS from unexpected sources
SIEM Query:
source="ofono" AND (error OR crash OR segfault)🔗 References
- https://bugzilla.redhat.com/show_bug.cgi?id=2255399
- https://bugzilla.redhat.com/show_bug.cgi?id=2255399
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/NBTPKR3LYTTLROPXF77FL4SPLXVHNC4T/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VG6FHQITWUNHBDGPXUQ77SZK5O5BYIBZ/
