CVE-2020-25664 : Exploit Details and Defense Strategies

ImageMagick prior to versions 7.0.8-68 and 6.9.10-68 is affected by an out-of-bounds write vulnerability in the PNG coder. An attacker could exploit this flaw by supplying a specially crafted image, potentially impacting availability with low data integrity risk.

Understanding CVE-2020-25664

This CVE details a vulnerability in ImageMagick that could be exploited by a specially crafted image to cause an out-of-bounds write.

What is CVE-2020-25664?

CVE-2020-25664 is a vulnerability in the PNG coder of ImageMagick that allows for an out-of-bounds write when certain functions are called, potentially leading to availability issues.

The Impact of CVE-2020-25664

The vulnerability could be exploited by an attacker to affect availability with a low impact on data integrity, making it a potential threat to systems running affected versions of ImageMagick.

Technical Details of CVE-2020-25664

This section provides more technical insights into the vulnerability.

Vulnerability Description

The flaw exists in the WriteOnePNGImage() function of the PNG coder in ImageMagick, where an improper call to AcquireVirtualMemory() and memset() leads to an out-of-bounds write when PopShortPixel() is invoked.

Affected Systems and Versions

ImageMagick versions prior to 7.0.8-68
ImageMagick versions prior to 6.9.10-68

Exploitation Mechanism

An attacker can exploit this vulnerability by providing a specially crafted image, triggering the out-of-bounds write and potentially impacting system availability.

Mitigation and Prevention

Protecting systems from CVE-2020-25664 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply the provided patch to ImageMagick versions 7.0.8-68 and 6.9.10-68.
Monitor for any unusual image processing activities that could indicate exploitation.

Long-Term Security Practices

Regularly update ImageMagick to the latest secure versions.
Implement image validation mechanisms to detect malicious inputs.

Patching and Updates

Ensure timely patching of ImageMagick to versions 7.0.8-68 and 6.9.10-68 to mitigate the vulnerability.