CVE-2021-1959
📋 TL;DR
This vulnerability in Qualcomm Snapdragon chipsets allows memory corruption due to improper input validation when handling index values. Attackers could exploit this to execute arbitrary code or cause denial of service. Affected devices include various Snapdragon-based automotive, mobile, IoT, and wearable products.
💻 Affected Systems
- Snapdragon Auto
- Snapdragon Compute
- Snapdragon Connectivity
- Snapdragon Consumer IOT
- Snapdragon Industrial IOT
- Snapdragon IoT
- Snapdragon Mobile
- Snapdragon Voice & Music
- Snapdragon Wearables
📦 What is this software?
Sd7c Firmware by Qualcomm
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, data theft, or persistent backdoor installation.
Likely Case
Local privilege escalation or denial of service affecting device stability.
If Mitigated
Limited impact with proper memory protections and exploit mitigations in place.
🎯 Exploit Status
Exploitation requires local access or ability to send crafted inputs to vulnerable components.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Varies by device manufacturer - check with OEM for specific firmware updates
Vendor Advisory: https://www.qualcomm.com/company/product-security/bulletins/october-2021-bulletin
Restart Required: Yes
Instructions:
1. Check with device manufacturer for firmware updates. 2. Apply manufacturer-provided patches. 3. Reboot device after patching.
🔧 Temporary Workarounds
Restrict local access
allLimit physical and network access to vulnerable devices
Enable exploit mitigations
linuxEnable ASLR, DEP, and other memory protection features
echo 2 > /proc/sys/kernel/randomize_va_space
setprop ro.kernel.qemu 0
🧯 If You Can't Patch
- Isolate vulnerable devices on separate network segments
- Implement strict access controls and monitoring
🔍 How to Verify
Check if Vulnerable:
Check device chipset model and firmware version against Qualcomm advisoryCheck Version:
getprop ro.bootloader or cat /proc/cpuinfo | grep -i qualcommVerify Fix Applied:
Verify firmware version has been updated to manufacturer's patched version📡 Detection & Monitoring
Log Indicators:
- Kernel panics
- Memory corruption errors in system logs
- Unexpected process crashes
Network Indicators:
- Unusual outbound connections from embedded devices
- Anomalous traffic patterns
SIEM Query:
source="kernel" AND ("panic" OR "segfault" OR "corruption") AND device_type="embedded"