CVE-2021-32494 : Exploit Details and Defense Strategies

A division by zero vulnerability in the Mach-O parser's rebase_buffer function of Radare2 allows attackers to exploit this issue and cause a denial of service attack.

Understanding CVE-2021-32494

This section provides details on the impact, technical aspects, and mitigation strategies related to CVE-2021-32494.

What is CVE-2021-32494?

CVE-2021-32494 is a critical vulnerability in Radare2 that arises due to a division by zero in the Mach-O parser's rebase_buffer function. Attackers can leverage this flaw to create malicious inputs leading to a denial of service.

The Impact of CVE-2021-32494

The impact of this vulnerability is assessed as critical, with high confidentiality, integrity, and availability impacts. It has a CVSS base score of 10, indicating a severe threat level.

Technical Details of CVE-2021-32494

Let's delve into the specifics of this vulnerability to understand its implications and potential risks.

Vulnerability Description

The vulnerability exists in Radare2's Mach-O parser, specifically in the rebase_buffer function, where a division by zero occurs. This flaw enables threat actors to craft malicious inputs, thereby initiating denial of service attacks.

Affected Systems and Versions

The vulnerability affects Radare2 version 5.3.0-git 26142. Users operating this version are at risk of exploitation until a patch is applied.

Exploitation Mechanism

By creating specially crafted inputs that trigger a division by zero in the rebase_buffer function, attackers can exploit this vulnerability and launch denial of service attacks.

Mitigation and Prevention

To safeguard systems and mitigate the risks associated with CVE-2021-32494, it is crucial to implement the following security measures.

Immediate Steps to Take

Update Radare2 to a patched version that addresses the division by zero vulnerability.
Monitor network traffic for any suspicious activities that could indicate an ongoing attack.

Long-Term Security Practices

Regularly update software and apply security patches promptly to prevent known vulnerabilities.
Implement network segmentation and access controls to minimize the impact of potential attacks.

Patching and Updates

Stay informed about security updates released by Radare2 and promptly apply patches to ensure your system is protected against CVE-2021-32494.