CVE-2023-21630
📋 TL;DR
This vulnerability allows memory corruption in Qualcomm's multimedia framework due to integer overflow when synx bind is called with synx signal. It affects Android devices with Qualcomm chipsets, potentially allowing attackers to execute arbitrary code or cause denial of service.
💻 Affected Systems
- Qualcomm chipsets with multimedia framework
- Android devices using affected Qualcomm components
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, data theft, or persistent malware installation.
Likely Case
Local privilege escalation allowing attackers to gain elevated permissions on the device.
If Mitigated
Denial of service or application crashes if exploitation attempts are blocked.
🎯 Exploit Status
Requires local access or malicious app installation; no public exploit code available as of knowledge cutoff.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Qualcomm security updates from April 2023 onward
Vendor Advisory: https://www.qualcomm.com/company/product-security/bulletins/april-2023-bulletin
Restart Required: Yes
Instructions:
1. Check device manufacturer for security updates. 2. Apply April 2023 or later Qualcomm security patches. 3. Reboot device after update installation.
🔧 Temporary Workarounds
Restrict app installations
androidPrevent installation of untrusted applications that could exploit this vulnerability.
adb shell settings put secure install_non_market_apps 0
🧯 If You Can't Patch
- Implement application allowlisting to prevent untrusted apps from running.
- Use mobile device management (MDM) to restrict device functionality and monitor for suspicious activity.
🔍 How to Verify
Check if Vulnerable:
Check Android security patch level: Settings > About phone > Android security patch level. If before April 2023, likely vulnerable.Check Version:
adb shell getprop ro.build.version.security_patchVerify Fix Applied:
Verify Android security patch level shows April 2023 or later date.📡 Detection & Monitoring
Log Indicators:
- Kernel panics
- Multimedia framework crashes
- Unexpected process terminations
Network Indicators:
- Unusual outbound connections from multimedia processes
SIEM Query:
Process:name contains 'mm-' AND (EventID:1000 OR EventID:1001) OR Exception:integer_overflow