CVE-2022-25733
📋 TL;DR
CVE-2022-25733 is a null pointer dereference vulnerability in Qualcomm modem firmware that allows denial of service attacks. When processing specially crafted DNS packets, the modem can crash, disrupting cellular connectivity. This affects devices using vulnerable Qualcomm modem chipsets.
💻 Affected Systems
- Qualcomm modem chipsets
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete loss of cellular connectivity requiring device reboot, potentially affecting mission-critical communications in industrial or emergency devices.
Likely Case
Temporary service disruption affecting mobile data and voice calls until modem resets or device reboots.
If Mitigated
Minimal impact with proper network filtering and updated firmware preventing malicious DNS packets from reaching vulnerable devices.
🎯 Exploit Status
Requires ability to send specially crafted DNS packets to vulnerable modem, typically from network perspective.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Refer to Qualcomm February 2023 security bulletin for specific patched versions
Vendor Advisory: https://www.qualcomm.com/company/product-security/bulletins/february-2023-bulletin
Restart Required: Yes
Instructions:
1. Check device manufacturer for firmware updates. 2. Apply Qualcomm modem firmware update. 3. Reboot device to activate new firmware.
🔧 Temporary Workarounds
Network DNS Filtering
allImplement DNS filtering at network perimeter to block malicious DNS packets
DNS Server Hardening
allConfigure DNS servers to validate and sanitize DNS responses
🧯 If You Can't Patch
- Implement strict network segmentation isolating vulnerable devices
- Deploy intrusion detection/prevention systems monitoring for DNS anomalies
🔍 How to Verify
Check if Vulnerable:
Check modem firmware version against Qualcomm advisory; no public vulnerability scanner availableCheck Version:
Device-specific commands vary by manufacturer; typically in device settings or diagnostic menusVerify Fix Applied:
Verify modem firmware version matches or exceeds patched version in Qualcomm bulletin📡 Detection & Monitoring
Log Indicators:
- Modem crash logs
- Unexpected modem resets
- DNS processing errors in modem logs
Network Indicators:
- Unusual DNS traffic patterns to cellular devices
- DNS packets with malformed structures
SIEM Query:
DNS packets with abnormal size or structure AND destination to cellular IP ranges