CVE-2019-11037 : Vulnerability Insights and Analysis

Between versions 3.3.0 and 3.4.4 of the PHP Imagick extension, a vulnerability in the ImagickKernel::fromMatrix() function could lead to a memory overwrite.

Understanding CVE-2019-11037

This CVE involves an out-of-bounds memory write vulnerability in the PHP Imagick extension.

What is CVE-2019-11037?

In versions 3.3.0 to 3.4.4 of the PHP Imagick extension, a flaw in the ImagickKernel::fromMatrix() function could result in a memory overwrite if untrusted data is supplied.

The Impact of CVE-2019-11037

The vulnerability has a CVSS base score of 4.9, with medium severity. It could allow an attacker to execute arbitrary code or cause a denial of service by exploiting the memory overwrite.

Technical Details of CVE-2019-11037

The technical details of this CVE provide insight into the vulnerability and its implications.

Vulnerability Description

The issue arises from the failure to validate the address before writing to an array of values in the ImagickKernel::fromMatrix() function, potentially leading to a memory overwrite.

Affected Systems and Versions

PHP Imagick extension versions 3.3.0 to 3.4.4 are affected.

Exploitation Mechanism

Attack Complexity: High
Attack Vector: Local
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality, Integrity, and Availability Impact: Low

Mitigation and Prevention

Protecting systems from CVE-2019-11037 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update PHP Imagick extension to version 3.4.4 or higher.
Avoid processing untrusted data with the affected function.

Long-Term Security Practices

Regularly update software and extensions to patch known vulnerabilities.
Implement code reviews and security testing to identify and address similar issues.

Patching and Updates

Apply patches provided by PHP Group to fix the vulnerability and enhance system security.