CVE-2021-33468 : Security Advisory and Response

An issue was discovered in yasm version 1.3.0 that leads to a use-after-free vulnerability in error() in modules/preprocs/nasm/nasm-pp.c.

Understanding CVE-2021-33468

This CVE identifies a critical vulnerability in yasm version 1.3.0 that could be exploited by attackers.

What is CVE-2021-33468?

CVE-2021-33468 is a use-after-free vulnerability discovered in the error() function within the preprocessor module of yasm version 1.3.0.

The Impact of CVE-2021-33468

This vulnerability could allow an attacker to execute arbitrary code or cause a denial of service (DoS) condition on affected systems.

Technical Details of CVE-2021-33468

The technical details of CVE-2021-33468 include:

Vulnerability Description

The vulnerability arises due to improper handling of memory operations in the error() function, leading to a use-after-free condition.

Affected Systems and Versions

Yasm version 1.3.0 is affected by this vulnerability.

Exploitation Mechanism

By crafting specific exploit code, an attacker could trigger the use-after-free condition in the error() function, potentially gaining unauthorized access or disrupting the system.

Mitigation and Prevention

To mitigate the risks associated with CVE-2021-33468, the following steps can be taken:

Immediate Steps to Take

Update yasm to a non-vulnerable version or apply patches provided by the vendor.
Monitor for any unusual activities that may indicate exploitation of the vulnerability.

Long-Term Security Practices

Regularly update software and libraries to their latest secure versions.
Implement proper input validation and error-checking mechanisms in the code.
Conduct security audits and penetration testing to identify and address potential vulnerabilities.
Stay informed about security advisories and patches released by software vendors.

Patching and Updates

Ensure timely application of security patches and updates to yasm to address known vulnerabilities and enhance the overall security posture of the system.