CVE-2022-30067: GIMP Buffer Overflow Vulnerability

CVE-2022-30067 Overview

CVE-2022-30067 is a Buffer Overflow vulnerability affecting GIMP (GNU Image Manipulation Program) versions 2.10.30 and 2.99.10. The vulnerability allows an attacker to craft a malicious XCF file that, when opened by a victim, causes the program to allocate an excessive amount of memory. This results in either insufficient memory conditions or a complete program crash, effectively causing a denial of service.

Critical Impact

Opening a specially crafted XCF file can cause GIMP to exhaust system memory resources or crash, disrupting user workflows and potentially affecting system stability.

Affected Products

• GIMP 2.10.30
• GIMP 2.99.10

Discovery Timeline

• 2022-05-17 - CVE-2022-30067 published to NVD
• 2024-11-21 - Last updated in NVD database

Technical Details for CVE-2022-30067

Vulnerability Analysis

This vulnerability is classified as CWE-120 (Buffer Copy without Checking Size of Input), commonly known as a classic buffer overflow. The flaw exists in how GIMP processes XCF (eXperimental Computing Facility) files, which is GIMP's native image format. When parsing a maliciously crafted XCF file, GIMP fails to properly validate size parameters before memory allocation, leading to an attempt to allocate an unreasonably large memory buffer.

The attack requires local access and user interaction—specifically, a victim must open a malicious XCF file. While this vulnerability does not allow for code execution or data theft, it can effectively render GIMP unusable and potentially impact system stability through memory exhaustion.

Root Cause

The root cause lies in insufficient input validation when parsing XCF file headers and layer data. The XCF format contains metadata specifying image dimensions and layer properties. When these values are manipulated to contain extremely large numbers, GIMP attempts to allocate memory buffers based on these untrusted values without adequate bounds checking. This results in either allocation failure or excessive memory consumption that can crash the application or degrade system performance.

Attack Vector

The attack vector is local, requiring user interaction. An attacker must convince a victim to open a specially crafted XCF file. This could be accomplished through various social engineering techniques:

1. Sending the malicious file via email attachment
2. Hosting the file on a website for download
3. Sharing through collaborative platforms or cloud storage
4. Embedding in project repositories or asset packages

When the victim opens the malicious XCF file with an affected version of GIMP, the application will attempt to process the corrupted size values, triggering the excessive memory allocation. The vulnerability exploits the trust relationship users have with image files, as XCF files are commonly exchanged among graphic designers and artists.

For technical details on the vulnerability mechanism, see the GitLab GIMP Issue Report.

Detection Methods for CVE-2022-30067

Indicators of Compromise

• Unusual XCF files with abnormally large file headers or metadata values
• GIMP process consuming excessive memory (significantly beyond normal usage patterns)
• System memory exhaustion events correlating with GIMP file operations
• GIMP application crashes when opening specific XCF files

Detection Strategies

• Monitor for abnormal memory allocation patterns in GIMP processes
• Implement file inspection rules to identify XCF files with suspicious metadata values
• Deploy endpoint detection solutions that can identify resource exhaustion attacks
• Use application crash monitoring to detect repeated GIMP failures

Monitoring Recommendations

• Configure process monitoring to alert on excessive memory consumption by gimp or gimp-2.10 processes
• Implement file integrity monitoring for XCF files in shared directories
• Review system logs for out-of-memory (OOM) events associated with GIMP
• Enable crash reporting and analyze dump files for buffer overflow signatures

How to Mitigate CVE-2022-30067

Immediate Actions Required

• Update GIMP to the latest stable version that includes the security fix
• Avoid opening XCF files from untrusted or unknown sources
• Configure system resource limits to prevent single applications from exhausting memory
• Consider using sandboxing solutions when opening files from untrusted sources

Patch Information

GIMP users should upgrade to a patched version of the software. Debian users can refer to the Debian LTS Announcement for distribution-specific patch information. For other platforms, check the official GIMP release notes and download the latest version from the official GIMP website.

Additional technical details and patch status can be found in the GitLab GIMP Issue Report.

Workarounds

• Validate XCF files using third-party tools before opening in GIMP
• Run GIMP with memory limits using system tools (e.g., ulimit on Linux)
• Use alternative image viewers to preview suspicious files before editing
• Implement organizational policies restricting XCF file sources to trusted origins

# Configuration example - Linux memory limit for GIMP
# Limit GIMP process to 4GB of virtual memory
ulimit -v 4194304
gimp

# Alternative using systemd resource control
systemd-run --scope -p MemoryMax=4G gimp