CVE-2015-9190
📋 TL;DR
This CVE describes an integer overflow vulnerability in Qualcomm Snapdragon bootloader code that allows bypassing memory protection checks. When exploited, it can lead to secondary bootloader (SBL) memory corruption, potentially enabling arbitrary code execution. Affected devices include Android smartphones and wearables with specific Qualcomm chipsets before April 2018 security patches.
💻 Affected Systems
- Android smartphones
- Android wearables
- Qualcomm-based IoT devices
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing persistent root access, bootloader unlocking, or installation of malicious firmware that survives factory resets.
Likely Case
Local privilege escalation allowing attackers to gain elevated permissions, bypass security mechanisms, or install persistent malware.
If Mitigated
Limited impact with proper security controls; device remains functional but vulnerable to local attacks requiring physical access or malware foothold.
🎯 Exploit Status
Exploitation requires understanding of bootloader internals and memory layout; likely requires physical access or significant local privileges.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Android security patch level 2018-04-05 or later
Vendor Advisory: https://source.android.com/security/bulletin/2018-04-01
Restart Required: Yes
Instructions:
1. Check device security patch level in Settings > About phone > Android security patch level. 2. If before April 2018, update device through Settings > System > System update. 3. For custom ROMs, apply Qualcomm-provided patches to bootloader source code. 4. Reboot device after update.
🔧 Temporary Workarounds
Disable bootloader debugging
androidPrevents unauthorized bootloader access through debugging interfaces
fastboot oem lock
fastboot flashing lock
🧯 If You Can't Patch
- Restrict physical access to devices and implement strict app installation policies
- Use mobile device management (MDM) solutions to monitor for suspicious bootloader activity
🔍 How to Verify
Check if Vulnerable:
Check Android security patch level: Settings > About phone > Android security patch level. If date is before April 2018, device is vulnerable.Check Version:
adb shell getprop ro.build.version.security_patchVerify Fix Applied:
Verify security patch level shows April 2018 or later. Check that bootloader remains locked and secure boot is enabled.📡 Detection & Monitoring
Log Indicators:
- Bootloader debug messages indicating memory corruption
- Kernel panic during boot
- Unexpected bootloader unlock events
Network Indicators:
- None - this is a local vulnerability
SIEM Query:
Device logs showing bootloader errors or unexpected reboots on Android devices with vulnerable chipsets