CVE-2023-43907 – CVE-2023-43907 is a buffer overflow vulnerabili... (How to Fix)

Q: What is the severity of CVE-2023-43907?

CVE-2023-43907 has a CVSS score of 7.8 (HIGH). CVE-2023-43907 is a buffer overflow vulnerability in OptiPNG's GIF processing code that allows attackers to execute arbitrary code or cause denial of service. This affects systems running OptiPNG v0.7.7 to process untrusted GIF files. Users who process GIF images from untrusted sources are at risk.

📋 TL;DR

CVE-2023-43907 is a buffer overflow vulnerability in OptiPNG's GIF processing code that allows attackers to execute arbitrary code or cause denial of service. This affects systems running OptiPNG v0.7.7 to process untrusted GIF files. Users who process GIF images from untrusted sources are at risk.

💻 Affected Systems

Products:

OptiPNG

Versions: v0.7.7

Operating Systems: All platforms running OptiPNG

Default Config Vulnerable: ⚠️ Yes

Notes: Any system using OptiPNG v0.7.7 to process GIF files is vulnerable regardless of configuration.

📦 What is this software?

Optipng by Optipng Project

View all CVEs affecting Optipng →

⚠️ Risk & Real-World Impact

🔴

Worst Case

Remote code execution leading to complete system compromise if OptiPNG processes malicious GIF files from untrusted sources.

🟠

Likely Case

Application crash (denial of service) when processing malformed GIF files.

🟢

If Mitigated

Limited impact if OptiPNG only processes trusted GIF files or runs with minimal privileges.

🌐 Internet-Facing: MEDIUM - Risk exists if OptiPNG processes user-uploaded GIF files via web applications or services.

🏢 Internal Only: LOW - Risk is limited to internal users processing GIF files, assuming no external file sources.

🎯 Exploit Status

Public PoC: ⚠️ Yes

Weaponized: LIKELY

Unauthenticated Exploit: ⚠️ Yes

Complexity: LOW

Proof-of-concept exploit code is publicly available, making exploitation straightforward for attackers.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: v0.7.8 or later

Vendor Advisory: http://optipng.sourceforge.net/

Restart Required: No

Instructions:

1. Download latest OptiPNG from http://optipng.sourceforge.net/ 2. Compile and install according to platform instructions 3. Replace existing optipng binary

🔧 Temporary Workarounds

Disable GIF processing

all

Configure applications to avoid using OptiPNG for GIF files

Run with reduced privileges

linux

Execute OptiPNG with minimal user permissions to limit impact

sudo -u nobody optipng [files]

🧯 If You Can't Patch

Restrict OptiPNG to process only trusted GIF files from known sources
Implement strict input validation and file type checking before passing files to OptiPNG

🔍 How to Verify

Check if Vulnerable:

Run 'optipng -v' and check if version is 0.7.7

Check Version:

optipng -v

Verify Fix Applied:

Run 'optipng -v' and confirm version is 0.7.8 or higher

📡 Detection & Monitoring

Log Indicators:

OptiPNG process crashes
Segmentation faults in application logs
Abnormal termination of image processing jobs

Network Indicators:

Unusual GIF file uploads to web applications
Multiple failed image processing requests

SIEM Query:

process_name:"optipng" AND (event_type:"crash" OR exit_code:139)

📊 Metadata

CVE ID: CVE-2023-43907

CVSS v3 Score: 7.8 (HIGH)

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

CWE: CWE-120

Published: October 1, 2023

Last Updated: November 21, 2024

🔗 References

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