CVE-2021-20224 : Exploit Details and Defense Strategies
Learn about CVE-2021-20224, an integer overflow issue in ImageMagick's ExportIndexQuantum() function that can lead to undefined behavior or crashes when processing a crafted PDF file. Find out about the impact, affected versions, and mitigation steps.
An integer overflow vulnerability was found in ImageMagick that could lead to undefined behavior or crashes when processing a specially crafted PDF file.
Understanding CVE-2021-20224
This CVE involves an integer overflow issue in ImageMagick's ExportIndexQuantum() function, potentially resulting in values outside the range of representable for 'unsigned char' when processing PDF files.
What is CVE-2021-20224?
CVE-2021-20224 is an integer overflow vulnerability in ImageMagick's Quantum Export feature, allowing an attacker to trigger undefined behavior or crashes by supplying a malicious PDF file.
The Impact of CVE-2021-20224
Exploitation of this vulnerability could lead to a denial of service (DoS) condition or potentially the execution of arbitrary code by an attacker, posing a significant risk to affected systems.
Technical Details of CVE-2021-20224
This section provides more insights into the vulnerability, affected systems, and the exploitation mechanism.
Vulnerability Description
The vulnerability arises due to integer overflow in ImageMagick's ExportIndexQuantum() function, potentially causing memory corruption and leading to crashes.
Affected Systems and Versions
- Vendor: N/A
- Product: ImageMagick
- Versions: Fixed in ImageMagick-7.0.10-57 and ImageMagick6-6.9.11-57
Exploitation Mechanism
By supplying a crafted PDF file, an attacker can trigger the integer overflow issue during the processing by ImageMagick, potentially leading to a crash or undefined behavior.
Mitigation and Prevention
To safeguard your systems from this vulnerability, follow the steps outlined below.
Immediate Steps to Take
- Apply the necessary patches provided by ImageMagick to mitigate the vulnerability.
- Avoid processing untrusted PDF files with ImageMagick until the system is patched.
Long-Term Security Practices
- Regularly update ImageMagick to the latest version to ensure all security patches are applied.
- Employ secure coding practices to prevent integer overflow vulnerabilities in software development.
Patching and Updates
Refer to the provided references for the official patches and more information on CVE-2021-20224.