CVE-2023-1999 : Exploit Details and Defense Strategies

This CVE details a use-after-free/double-free vulnerability in libwebp, specifically affecting versions less than 1.3.1 and 1.3.0-8-ga486d800. It was published on June 20, 2023, by Google.

Understanding CVE-2023-1999

This vulnerability poses a medium severity risk and can lead to privilege escalation, as identified by CAPEC-233.

What is CVE-2023-1999?

The vulnerability involves a use-after-free/double-free issue in libwebp's

ApplyFiltersAndEncode()

function. An attacker can potentially manipulate pointers in a way that leads to memory errors and a double-free condition.

The Impact of CVE-2023-1999

CVE-2023-1999 has a base score of 5.3 with a confidentiality impact of high. The attack complexity is high, but privileges required are low. If exploited, this vulnerability could result in privilege escalation.

Technical Details of CVE-2023-1999

This section delves into the specific technical aspects of the vulnerability.

Vulnerability Description

The vulnerability arises due to improper handling of pointers in the

ApplyFiltersAndEncode()

function, leading to a double-free scenario and potential memory manipulation by an attacker.

Affected Systems and Versions

Versions of libwebp prior to 1.3.1 and 1.3.0-8-ga486d800 are impacted by this vulnerability.

Exploitation Mechanism

An attacker can exploit this vulnerability by leveraging the memory errors within the

ApplyFiltersAndEncode()

function, facilitating privilege escalation through pointer manipulation.

Mitigation and Prevention

Addressing CVE-2023-1999 promptly is crucial to maintaining system security.

Immediate Steps to Take

Update libwebp to version 1.3.1 or higher to mitigate the vulnerability.
Monitor systems for any signs of unusual activity that may indicate an exploit attempt.

Long-Term Security Practices

Implement regular security audits and code reviews to detect and address vulnerabilities early.
Educate developers on secure coding practices to prevent similar issues in the future.

Patching and Updates

Stay informed about security updates from libwebp and promptly apply patches to ensure the latest safeguards against vulnerabilities like CVE-2023-1999.