CVE-2020-25666 Explained : Impact and Mitigation

CVE-2020-25666 is a vulnerability in ImageMagick that could lead to integer overflow during simple math calculations, potentially affecting application reliability.

Understanding CVE-2020-25666

What is CVE-2020-25666?

The vulnerability in HistogramCompare() in MagickCore/histogram.c could result in integer overflow during rgb value and count calculations, impacting ImageMagick versions prior to 7.0.9-0.

The Impact of CVE-2020-25666

The flaw could compromise the reliability of applications processing crafted input files using ImageMagick.

Technical Details of CVE-2020-25666

Vulnerability Description

The vulnerability arises from integer overflow possibilities in simple math calculations within HistogramCompare() in MagickCore/histogram.c.

Affected Systems and Versions

Vendor: n/a
Product: ImageMagick
Affected Versions: prior to 7.0.9-0

Exploitation Mechanism

The flaw could be exploited by processing a specially crafted input file, triggering the integer overflow during rgb value and count calculations.

Mitigation and Prevention

Immediate Steps to Take

Apply the provided patch that uses casts to

ssize_t

type for calculations.
Update ImageMagick to version 7.0.9-0 or later to mitigate the vulnerability.

Long-Term Security Practices

Regularly update software and libraries to the latest versions.
Implement input validation mechanisms to prevent crafted file exploitation.

Patching and Updates

Ensure ImageMagick is regularly updated to the latest version to address security vulnerabilities.