CVE-2021-46021 Explained : Impact and Mitigation

An Use-After-Free vulnerability in rec_record_destroy() at rec-record.c of GNU Recutils v1.8.90 can lead to a segmentation fault or application crash.

Understanding CVE-2021-46021

This CVE relates to a vulnerability in GNU Recutils v1.8.90 that could result in a segmentation fault or application crash.

What is CVE-2021-46021?

CVE-2021-46021 is an Use-After-Free vulnerability found in rec_record_destroy() within GNU Recutils v1.8.90, potentially leading to a segmentation fault or application crash.

The Impact of CVE-2021-46021

The vulnerability can be exploited to cause a segmentation fault or application crash, which may result in denial of service or potentially arbitrary code execution.

Technical Details of CVE-2021-46021

This section provides more technical insights into the vulnerability.

Vulnerability Description

The vulnerability exists in the rec_record_destroy() function of GNU Recutils v1.8.90 due to improper memory handling, leading to the Use-After-Free condition.

Affected Systems and Versions

Affected Version: GNU Recutils v1.8.90
Systems using the affected version of GNU Recutils are at risk.

Exploitation Mechanism

Attackers can exploit this vulnerability by crafting a specially designed input to trigger the Use-After-Free condition in rec_record_destroy(), potentially leading to a crash.

Mitigation and Prevention

To address CVE-2021-46021 and enhance system security, consider the following steps.

Immediate Steps to Take

Update GNU Recutils to a patched version that addresses the Use-After-Free vulnerability.
Monitor vendor sources for official patches and advisories.

Long-Term Security Practices

Implement secure coding practices to prevent memory-related vulnerabilities.
Regularly update and maintain software to apply security patches promptly.

Patching and Updates

Apply patches provided by GNU Recutils or relevant vendors to mitigate the vulnerability promptly.