CVE-2023-4232
📋 TL;DR
CVE-2023-4232 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. This affects Linux systems running vulnerable versions of ofono telephony software.
💻 Affected Systems
- ofono
📦 What is this software?
Fedora by Fedoraproject
Fedora by Fedoraproject
Ofono by Ofono Project
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, privilege escalation, and potential lateral movement within affected networks.
Likely Case
Denial of service (crash) of ofono service, potentially disrupting telephony/SMS functionality on affected systems.
If Mitigated
Limited impact if SMS functionality is disabled or network segmentation prevents malicious SMS delivery.
🎯 Exploit Status
Exploitation requires sending specially crafted SMS messages or compromising modem/base station. No public exploit code known at this time.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check distribution-specific updates (Fedora, RHEL, etc.)
Vendor Advisory: https://bugzilla.redhat.com/show_bug.cgi?id=2255394
Restart Required: Yes
Instructions:
1. Update ofono package via your distribution's package manager. 2. For Fedora/RHEL: 'sudo dnf update ofono'. 3. Restart ofono service: 'sudo systemctl restart ofono'.
🔧 Temporary Workarounds
Disable SMS functionality
linuxTemporarily disable SMS message processing in ofono if not required
sudo systemctl stop ofono
sudo systemctl disable ofono
🧯 If You Can't Patch
- Implement network segmentation to isolate systems with SMS capabilities
- Deploy SMS filtering/gateway solutions to block malicious SMS messages
🔍 How to Verify
Check if Vulnerable:
Check ofono version: 'ofonod --version' or 'rpm -q ofono' (RHEL/Fedora) or 'dpkg -l ofono' (Debian/Ubuntu)Check Version:
ofonod --version 2>/dev/null || rpm -q ofono || dpkg -l ofono | grep ofonoVerify Fix Applied:
Verify updated version is installed and ofono service is running without crashes📡 Detection & Monitoring
Log Indicators:
- ofono service crashes
- segmentation faults in ofono logs
- unusual SMS processing errors
Network Indicators:
- Unusual SMS traffic patterns
- SMS messages with malformed headers
SIEM Query:
process.name: "ofonod" AND (event.action: "crashed" OR event.outcome: "failure")