CVE-2019-25052
📋 TL;DR
This vulnerability in Linaro OP-TEE allows attackers to cause crashes that could leak sensitive information by calling cryptographic functions with inconsistent or malformed data. It affects systems using OP-TEE for trusted execution environments before version 3.7.0. The high CVSS score indicates significant potential impact on confidentiality and availability.
💻 Affected Systems
- Linaro OP-TEE
📦 What is this software?
Op Tee by Linaro
⚠️ Risk & Real-World Impact
Worst Case
Sensitive cryptographic keys and secure memory contents could be leaked, potentially compromising the entire trusted execution environment and enabling further attacks on the system.
Likely Case
Denial of service through OP-TEE crashes, with possible information leakage about cryptographic operations or memory layout.
If Mitigated
Limited impact if proper input validation and isolation controls are in place, though the vulnerability still represents a serious security flaw.
🎯 Exploit Status
Exploitation requires ability to call cryptographic functions with malformed data, typically requiring some level of access to the trusted execution environment.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 3.7.0 and later
Vendor Advisory: https://github.com/OP-TEE/optee_os/security/advisories/GHSA-pgwr-qmgh-vhmf
Restart Required: Yes
Instructions:
1. Update OP-TEE to version 3.7.0 or later. 2. Rebuild and redeploy the OP-TEE firmware. 3. Reboot the affected systems to load the updated firmware.
🔧 Temporary Workarounds
Input validation enhancement
allImplement additional input validation for cryptographic function calls
🧯 If You Can't Patch
- Restrict access to cryptographic functions to trusted components only
- Implement monitoring for abnormal OP-TEE crashes and investigate any occurrences
🔍 How to Verify
Check if Vulnerable:
Check OP-TEE version: cat /proc/device-tree/firmware/optee/version or check build configurationCheck Version:
cat /proc/device-tree/firmware/optee/version 2>/dev/null || grep 'CFG_OPTEE_REVISION' in build configurationVerify Fix Applied:
Verify OP-TEE version is 3.7.0 or later and check that the commit 34a08bec755670ea0490cb53bbc68058cafc69b6 is included📡 Detection & Monitoring
Log Indicators:
- OP-TEE crash logs
- Unexpected cryptographic function calls
- Memory access violations in secure world
SIEM Query:
source="optee" AND (event="crash" OR event="panic" OR event="exception")🔗 References
- https://github.com/OP-TEE/optee_os/commit/34a08bec755670ea0490cb53bbc68058cafc69b6
- https://github.com/OP-TEE/optee_os/security/advisories/GHSA-pgwr-qmgh-vhmf
- https://github.com/OP-TEE/optee_os/commit/34a08bec755670ea0490cb53bbc68058cafc69b6
- https://github.com/OP-TEE/optee_os/security/advisories/GHSA-pgwr-qmgh-vhmf
