CVE-2025-26623
📋 TL;DR
A heap buffer overflow vulnerability in Exiv2 versions 0.28.0 through 0.28.4 allows attackers to potentially execute arbitrary code by tricking victims into processing a crafted image file with metadata writing operations. This affects users who run Exiv2 command-line tools or applications using the Exiv2 library for writing metadata to image files. The vulnerability is only triggered during metadata writing operations, which are less common than reading operations.
💻 Affected Systems
- Exiv2 library
- Exiv2 command-line utility
- Applications using Exiv2 library
📦 What is this software?
Exiv2 by Exiv2
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution with the privileges of the user running Exiv2, potentially leading to full system compromise.
Likely Case
Application crash (denial of service) when processing malicious image files; code execution is possible but requires specific conditions.
If Mitigated
No impact if Exiv2 is not used for metadata writing operations or if proper input validation and sandboxing are implemented.
🎯 Exploit Status
Exploitation requires the victim to process a crafted image file with metadata writing operations. No authentication is needed, but user interaction or automated processing is required.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v0.28.5
Vendor Advisory: https://github.com/Exiv2/exiv2/security/advisories/GHSA-38h4-fx85-qcx7
Restart Required: No
Instructions:
1. Download Exiv2 v0.28.5 or later from the official repository. 2. Compile and install according to your system's package manager or build instructions. 3. For applications using Exiv2 as a library, update the dependency to v0.28.5+ and recompile.
🔧 Temporary Workarounds
Disable metadata writing operations
allRestrict usage of Exiv2 to read-only operations and avoid commands like 'fixiso' that trigger metadata writing.
🧯 If You Can't Patch
- Restrict Exiv2 usage to trusted users and monitor for unexpected metadata writing operations.
- Implement application sandboxing or containerization to limit potential damage from exploitation.
🔍 How to Verify
Check if Vulnerable:
Check Exiv2 version with 'exiv2 --version' or examine library version in applications. If version is between 0.28.0 and 0.28.4 inclusive, the system is vulnerable.Check Version:
exiv2 --versionVerify Fix Applied:
After updating, run 'exiv2 --version' to confirm version is v0.28.5 or later.📡 Detection & Monitoring
Log Indicators:
- Application crashes or abnormal termination when processing image files
- Unexpected memory access errors in system logs
Network Indicators:
- Unusual file uploads to systems using Exiv2 for image processing
SIEM Query:
Process execution logs showing 'exiv2' command with arguments like 'fixiso' followed by crash indicators.