CVE-2019-19624 : Exploit Details and Defense Strategies

A vulnerability was found in OpenCV prior to version 4.1.1, leading to an out-of-bounds read due to incorrect assumptions in the calc()/ocl_calc() functions.

Understanding CVE-2019-19624

What is CVE-2019-19624?

This CVE identifies an out-of-bounds read vulnerability in OpenCV before version 4.1.1, specifically in the calc()/ocl_calc() functions within the dis_flow.cpp file.

The Impact of CVE-2019-19624

The vulnerability allows for an out-of-bounds read of heap-allocated arrays Ux and Uy, potentially leading to information disclosure or denial of service.

Technical Details of CVE-2019-19624

Vulnerability Description

The calc()/ocl_calc() functions in dis_flow.cpp incorrectly assume that a certain variable relationship holds, leading to out-of-bounds reads in small image scenarios.

Affected Systems and Versions

OpenCV versions prior to 4.1.1

Exploitation Mechanism

Exploitation involves manipulating the variable relationship in the calc()/ocl_calc() functions to trigger out-of-bounds reads.

Mitigation and Prevention

Immediate Steps to Take

Update OpenCV to version 4.1.1 or later to mitigate the vulnerability.
Monitor vendor security advisories for patches and updates.

Long-Term Security Practices

Regularly update software and libraries to the latest versions.
Implement secure coding practices to prevent similar vulnerabilities.

Patching and Updates

Apply patches provided by OpenCV promptly to address the vulnerability.