CVE-2022-25728
📋 TL;DR
CVE-2022-25728 is a buffer over-read vulnerability in Qualcomm modem firmware that allows information disclosure when processing DNS server responses. Attackers can read adjacent memory contents, potentially exposing sensitive data. This affects devices using vulnerable Qualcomm modem chipsets.
💻 Affected Systems
- Qualcomm modem chipsets (specific models not publicly detailed)
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete modem memory dump exposing encryption keys, IMSI/IMEI identifiers, location data, and other sensitive telecommunication information
Likely Case
Limited information disclosure of adjacent memory buffers containing network configuration data or partial identifiers
If Mitigated
No data exposure if patched or with proper network segmentation preventing DNS manipulation
🎯 Exploit Status
Exploitation requires ability to manipulate DNS responses to target device, either through network position or DNS server compromise
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Qualcomm modem firmware updates released February 2023
Vendor Advisory: https://www.qualcomm.com/company/product-security/bulletins/february-2023-bulletin
Restart Required: Yes
Instructions:
1. Check with device manufacturer for firmware updates. 2. Apply Qualcomm modem firmware patches. 3. Reboot device to activate new firmware.
🔧 Temporary Workarounds
DNS Security Controls
allImplement DNSSEC and use trusted DNS servers to prevent DNS response manipulation
Network Segmentation
allIsolate vulnerable devices from untrusted networks and implement strict firewall rules
🧯 If You Can't Patch
- Segment vulnerable devices on isolated network segments with restricted DNS access
- Monitor for unusual DNS traffic patterns and implement DNS filtering solutions
🔍 How to Verify
Check if Vulnerable:
Check device firmware version against manufacturer's security bulletin. No public vulnerability scanner available.Check Version:
Device-specific commands vary by manufacturer. Typically in Settings > About Phone > Baseband VersionVerify Fix Applied:
Verify modem firmware has been updated to post-February 2023 versions via device settings or manufacturer tools📡 Detection & Monitoring
Log Indicators:
- Unusual DNS response sizes or patterns in modem logs
- Modem crash or restart events
Network Indicators:
- Abnormal DNS traffic to mobile devices
- Unexpected large DNS responses
SIEM Query:
DNS response size > [threshold] AND destination in mobile_device_network