CVE-2019-13109 : Exploit Details and Defense Strategies

A vulnerability in Exiv2, versions up to 0.27.1, can be exploited by an attacker to trigger a denial of service (SIGSEGV) by using a manipulated PNG image file due to mishandling in the PngImage::readMetadata function.

Understanding CVE-2019-13109

This CVE identifies an integer overflow vulnerability in Exiv2 software.

What is CVE-2019-13109?

Exiv2 versions up to 0.27.1 are susceptible to a denial of service attack caused by mishandling subtraction in the PngImage::readMetadata function when processing PNG image files.

The Impact of CVE-2019-13109

The vulnerability allows an attacker to exploit a crafted PNG image file to cause a denial of service (SIGSEGV) on the affected system.

Technical Details of CVE-2019-13109

Exiv2 vulnerability technical specifics.

Vulnerability Description

An integer overflow in Exiv2 through version 0.27.1 enables an attacker to trigger a denial of service by exploiting a crafted PNG image file.

Affected Systems and Versions

Exiv2 versions up to 0.27.1

Exploitation Mechanism

Attackers can exploit the vulnerability by using a manipulated PNG image file to trigger a denial of service (SIGSEGV).

Mitigation and Prevention

Protecting systems from CVE-2019-13109.

Immediate Steps to Take

Update Exiv2 to version 0.27.1 or later to mitigate the vulnerability.
Avoid opening untrusted PNG image files.

Long-Term Security Practices

Regularly update software and apply security patches.
Implement network security measures to prevent malicious file uploads.
Conduct security training for users on identifying and handling suspicious files.

Patching and Updates

Stay informed about security advisories and updates from Exiv2.