CVE-2020-19668 : Security Advisory and Response

A vulnerability in libsixel 1.8.6 can lead to out-of-bounds access due to unverified array indexes.

Understanding CVE-2020-19668

This CVE involves a specific issue in the gif_out_code function within fromgif.c in libsixel 1.8.6.

What is CVE-2020-19668?

The vulnerability arises from unverified indexes into an array, resulting in out-of-bounds access in the gif_out_code function in fromgif.c in libsixel 1.8.6.

The Impact of CVE-2020-19668

The vulnerability could potentially be exploited by attackers to gain unauthorized access, execute arbitrary code, or cause a denial of service (DoS) condition.

Technical Details of CVE-2020-19668

This section provides more technical insights into the vulnerability.

Vulnerability Description

The issue stems from unverified array indexes, leading to out-of-bounds access in the gif_out_code function in fromgif.c in libsixel 1.8.6.

Affected Systems and Versions

Affected Version: libsixel 1.8.6
Other versions may also be impacted.

Exploitation Mechanism

Attackers can exploit this vulnerability by manipulating array indexes to access memory locations outside the bounds of the array.

Mitigation and Prevention

To address CVE-2020-19668, follow these mitigation strategies:

Immediate Steps to Take

Update libsixel to a patched version.
Implement input validation to prevent unverified array accesses.

Long-Term Security Practices

Regularly update software and libraries to the latest secure versions.
Conduct security assessments and code reviews to identify and fix similar vulnerabilities.

Patching and Updates

Apply patches provided by the vendor promptly to mitigate the vulnerability.