CVE-2017-13317
📋 TL;DR
CVE-2017-13317 is an out-of-bounds read vulnerability in Android's HEIF image decoder that could allow remote attackers to read sensitive memory information. This affects Android devices processing malicious HEIF images, requiring user interaction to open such images. The vulnerability enables information disclosure without requiring additional privileges.
💻 Affected Systems
- Android
📦 What is this software?
Android by Google
⚠️ Risk & Real-World Impact
Worst Case
Remote attacker could read sensitive memory contents from the device, potentially exposing cryptographic keys, authentication tokens, or other protected data.
Likely Case
Information disclosure of limited memory contents when user opens a malicious HEIF image, potentially revealing application data or system information.
If Mitigated
No impact if patched or if users avoid opening untrusted HEIF images from unknown sources.
🎯 Exploit Status
Requires user interaction (opening malicious HEIF image) and specific memory layout conditions for successful exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Android security patch level 2018-05-01 or later
Vendor Advisory: https://source.android.com/security/bulletin/pixel/2018-05-01
Restart Required: Yes
Instructions:
1. Apply Android security update with patch level 2018-05-01 or later. 2. For Pixel devices, install the May 2018 security update. 3. For other Android devices, check with manufacturer for available updates. 4. Reboot device after update installation.
🔧 Temporary Workarounds
Disable HEIF image processing
androidPrevent HEIF image decoding by disabling or removing HEIF support
Not applicable - requires system-level configuration changes
User education
allInstruct users to avoid opening HEIF images from untrusted sources
🧯 If You Can't Patch
- Implement application whitelisting to prevent untrusted applications from processing HEIF images
- Use network filtering to block HEIF image downloads from untrusted sources
🔍 How to Verify
Check if Vulnerable:
Check Android security patch level in Settings > About phone > Android security patch level. If earlier than 2018-05-01, device is vulnerable.Check Version:
adb shell getprop ro.build.version.security_patchVerify Fix Applied:
Verify Android security patch level shows 2018-05-01 or later date.📡 Detection & Monitoring
Log Indicators:
- Media server crashes
- HEIF decoder errors in system logs
- Unexpected memory access violations
Network Indicators:
- HEIF image downloads from suspicious sources
- Multiple failed HEIF parsing attempts
SIEM Query:
source="android_system" AND ("heif" OR "HeifDecoderImpl") AND ("crash" OR "exception" OR "out of bounds")