CVE-2020-14152
📋 TL;DR
This vulnerability in IJG JPEG (libjpeg) allows excessive memory consumption when processing JPEG images. The jpeg_mem_available() function fails to respect the max_memory_to_use setting, potentially causing denial of service through resource exhaustion. Any application using vulnerable versions of libjpeg for JPEG decoding is affected.
💻 Affected Systems
- IJG JPEG (libjpeg)
- Applications using libjpeg for JPEG decoding
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system denial of service due to memory exhaustion, potentially crashing the application or entire system.
Likely Case
Application crashes or becomes unresponsive when processing specially crafted JPEG images, causing service disruption.
If Mitigated
Limited impact with proper memory limits and monitoring in place, though still vulnerable to targeted attacks.
🎯 Exploit Status
Exploitation requires crafting a malicious JPEG image that triggers excessive memory allocation. Public proof-of-concept exists in bug reports.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version 9d and later
Vendor Advisory: http://www.ijg.org/
Restart Required: Yes
Instructions:
1. Download jpegsrc.v9d.tar.gz from http://www.ijg.org/files/jpegsrc.v9d.tar.gz
2. Extract and compile: tar -xzf jpegsrc.v9d.tar.gz && cd jpeg-9d && ./configure && make && make install
3. Recompile any applications using libjpeg against the updated library
4. Restart affected services
🔧 Temporary Workarounds
Memory limit enforcement
linuxUse system memory limits to restrict process memory consumption
ulimit -v [memory_limit_in_kb]
systemd: MemoryMax=[memory_limit_in_bytes] in service unit
Input validation
allImplement image size and format validation before processing
🧯 If You Can't Patch
- Implement strict memory limits on processes using libjpeg
- Isolate image processing to dedicated containers/vms with resource constraints
🔍 How to Verify
Check if Vulnerable:
Check libjpeg version: djpeg -version 2>&1 | grep -i versionCheck Version:
djpeg -version 2>&1 | head -5Verify Fix Applied:
Verify version is 9d or later: djpeg -version 2>&1 | grep -E '9d|9[0-9]|[1-9][0-9]+'📡 Detection & Monitoring
Log Indicators:
- Application crashes with memory allocation errors
- High memory usage spikes during image processing
- Out of memory (OOM) killer events
Network Indicators:
- Unusually large JPEG file uploads
- Repeated image upload attempts
SIEM Query:
source="application.logs" AND ("out of memory" OR "malloc failed" OR "memory allocation") AND process="djpeg"