CVE-2024-41131 – An out-of-bounds write vulnerability in ImageSh... (How to Fix)

Q: What is the severity of CVE-2024-41131?

CVE-2024-41131 has a CVSS score of 7.5 (HIGH). An out-of-bounds write vulnerability in ImageSharp's GIF decoder allows attackers to cause denial of service by crashing applications processing specially crafted GIF files. All applications using vulnerable versions of ImageSharp are affected. The vulnerability is triggered when decoding malicious GIF images.

📋 TL;DR

An out-of-bounds write vulnerability in ImageSharp's GIF decoder allows attackers to cause denial of service by crashing applications processing specially crafted GIF files. All applications using vulnerable versions of ImageSharp are affected. The vulnerability is triggered when decoding malicious GIF images.

💻 Affected Systems

Products:

SixLabors.ImageSharp

Versions: All versions before 2.1.9 and 3.1.5

Operating Systems: All platforms where ImageSharp runs (Windows, Linux, macOS)

Default Config Vulnerable: ⚠️ Yes

Notes: Any application using ImageSharp to decode GIF files is vulnerable regardless of configuration.

📦 What is this software?

Imagesharp by Sixlabors

View all CVEs affecting Imagesharp →

Imagesharp by Sixlabors

View all CVEs affecting Imagesharp →

⚠️ Risk & Real-World Impact

🔴

Worst Case

Complete application crash leading to denial of service, potentially affecting availability of services that process user-uploaded images.

🟠

Likely Case

Application crashes when processing malicious GIF files, causing temporary service disruption until the application restarts.

🟢

If Mitigated

With proper input validation and sandboxing, impact is limited to the specific process handling the malicious file.

🌐 Internet-Facing: HIGH - Applications accepting user-uploaded GIF files from the internet are directly exposed.

🏢 Internal Only: MEDIUM - Internal applications processing GIF files could be targeted by malicious insiders or compromised internal systems.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ⚠️ Yes

Complexity: LOW - Requires only a malicious GIF file to trigger

Exploitation requires the application to process a specially crafted GIF file. No authentication or special privileges needed.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: 2.1.9 or 3.1.5

Vendor Advisory: https://github.com/SixLabors/ImageSharp/security/advisories/GHSA-63p8-c4ww-9cg7

Restart Required: Yes

Instructions:

1. Update ImageSharp package via NuGet: 'Update-Package SixLabors.ImageSharp' 2. For .NET CLI: 'dotnet add package SixLabors.ImageSharp --version 3.1.5' (or 2.1.9) 3. Rebuild and redeploy application 4. Restart affected services

🔧 Temporary Workarounds

Disable GIF processing

all

Temporarily disable GIF file processing in applications

Implement file type validation to reject GIF files
Configure image processing to skip GIF format

Input validation and sanitization

all

Validate and sanitize GIF files before processing

Implement file signature validation
Use external tools to validate GIF integrity before passing to ImageSharp

🧯 If You Can't Patch

Implement strict file upload restrictions to block GIF files
Run ImageSharp in isolated containers or sandboxes to limit crash impact

🔍 How to Verify

Check if Vulnerable:

Check ImageSharp package version in project file or via 'dotnet list package'

Check Version:

dotnet list package | findstr ImageSharp

Verify Fix Applied:

Verify installed version is 2.1.9 or higher (for 2.x) or 3.1.5 or higher (for 3.x)

📡 Detection & Monitoring

Log Indicators:

Application crashes with memory access violations
Unhandled exceptions in ImageSharp GIF decoder
Sudden process termination during image processing

Network Indicators:

Multiple failed GIF upload attempts
Unusual patterns in image upload traffic

SIEM Query:

EventID: 1000 OR Exception: 'System.AccessViolationException' AND ProcessName: [YourAppName] AND Message: '*ImageSharp*' OR '*GIF*'

📊 Metadata

CVE ID: CVE-2024-41131

CVSS v3 Score: 7.5 (HIGH)

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE: CWE-787

Published: July 22, 2024

Last Updated: November 21, 2024

🔗 References

https://github.com/SixLabors/ImageSharp/commit/9dda64a8186af67baf06b6d9c1ab599c3608b693 Patch
https://github.com/SixLabors/ImageSharp/commit/a1f287977139109a987065643b8172c748abdadb Patch
https://github.com/SixLabors/ImageSharp/pull/2754 Issue Tracking
https://github.com/SixLabors/ImageSharp/pull/2756 Issue Tracking
https://github.com/SixLabors/ImageSharp/security/advisories/GHSA-63p8-c4ww-9cg7 Vendor Advisory
https://github.com/SixLabors/ImageSharp/commit/9dda64a8186af67baf06b6d9c1ab599c3608b693 Patch
https://github.com/SixLabors/ImageSharp/commit/a1f287977139109a987065643b8172c748abdadb Patch
https://github.com/SixLabors/ImageSharp/pull/2754 Issue Tracking
https://github.com/SixLabors/ImageSharp/pull/2756 Issue Tracking
https://github.com/SixLabors/ImageSharp/security/advisories/GHSA-63p8-c4ww-9cg7 Vendor Advisory

📤 Share & Export

📄 Export Markdown 📋 Export JSON

🔗 Related Vulnerabilities

If you're affected by CVE-2024-41131, you might also want to check these: