CVE-2023-31973 : Security Advisory and Response

A detailed analysis of the CVE-2023-31973 vulnerability affecting yasm v1.3.0

Understanding CVE-2023-31973

This CVE refers to a use after free vulnerability discovered in yasm v1.3.0 via the function expand_mmac_params at /nasm/nasm-pp.c.

What is CVE-2023-31973?

CVE-2023-31973 is a use after free vulnerability found in yasm v1.3.0, allowing attackers to potentially execute arbitrary code by manipulating memory pointers after they have been freed.

The Impact of CVE-2023-31973

This vulnerability could be exploited by malicious actors to execute arbitrary code, leading to system compromise, data loss, or unauthorized access.

Technical Details of CVE-2023-31973

A closer look at the specifics of the vulnerability.

Vulnerability Description

The issue arises from improper handling of memory after it has been freed, potentially leading to a situation where an attacker can execute malicious code.

Affected Systems and Versions

All instances of yasm v1.3.0 are affected by this vulnerability.

Exploitation Mechanism

Attackers can exploit this vulnerability by crafting malicious inputs that manipulate memory pointers in a way that leads to the execution of unauthorized code.

Mitigation and Prevention

Steps to mitigate and prevent exploitation of CVE-2023-31973.

Immediate Steps to Take

Update yasm to a patched version that addresses the use after free vulnerability.
Monitor for any signs of exploitation or unauthorized code execution.

Long-Term Security Practices

Implement secure coding practices to reduce the likelihood of memory-related vulnerabilities.
Regularly update software and libraries to include security patches.

Patching and Updates

Ensure timely application of patches and updates to yasm to mitigate the risk posed by CVE-2023-31973.