CVE-2022-25747
📋 TL;DR
CVE-2022-25747 is an information disclosure vulnerability in Qualcomm modems due to improper input validation when parsing CoAP (Constrained Application Protocol) messages. This allows attackers to potentially read sensitive memory contents from the modem. Affected systems include devices using vulnerable Qualcomm modem chipsets.
💻 Affected Systems
- Qualcomm modem chipsets
📦 What is this software?
Snapdragon X5 Lte Modem Firmware by Qualcomm
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of modem memory, potentially exposing sensitive device information, cryptographic keys, or user data stored in modem memory.
Likely Case
Limited information disclosure of modem memory contents, potentially revealing device identifiers, configuration data, or partial memory dumps.
If Mitigated
No information disclosure if proper input validation is implemented or CoAP messages are filtered/blocked.
🎯 Exploit Status
Exploitation requires crafting malicious CoAP messages and sending them to the modem interface, which may require specific network access.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Refer to Qualcomm security bulletin for specific patched firmware versions
Vendor Advisory: https://www.qualcomm.com/company/product-security/bulletins/april-2023-bulletin
Restart Required: Yes
Instructions:
1. Check with device manufacturer for firmware updates. 2. Apply Qualcomm-provided modem firmware patches. 3. Reboot device to load new firmware.
🔧 Temporary Workarounds
Network filtering
allBlock or filter CoAP traffic to modem interfaces
Access restriction
allRestrict network access to modem management interfaces
🧯 If You Can't Patch
- Implement network segmentation to isolate modem interfaces
- Monitor for unusual CoAP traffic patterns
🔍 How to Verify
Check if Vulnerable:
Check modem firmware version against Qualcomm's patched versions listCheck Version:
Device-specific commands vary by manufacturer (e.g., Android: getprop | grep version.baseband)Verify Fix Applied:
Verify modem firmware has been updated to patched version📡 Detection & Monitoring
Log Indicators:
- Unusual CoAP message patterns in modem logs
- Memory access errors in modem firmware logs
Network Indicators:
- Malformed CoAP packets to modem ports
- Unexpected CoAP traffic to modem interfaces
SIEM Query:
network.protocol:coap AND (packet.size:unusual OR destination.port:modem_ports)