CVE-2020-3327 : Vulnerability Insights and Analysis

ClamAV ARJ Archive Parsing Denial of Service Vulnerability

Understanding CVE-2020-3327

A vulnerability in the ARJ archive parsing module in Clam AntiVirus (ClamAV) Software versions 0.102.2 could allow an unauthenticated, remote attacker to cause a denial of service condition on an affected device.

What is CVE-2020-3327?

The vulnerability in ClamAV allows an attacker to exploit a heap buffer overflow read by sending a crafted ARJ file, crashing the ClamAV scanning process.

The Impact of CVE-2020-3327

The vulnerability has a CVSS base score of 7.5 (High) with a high availability impact, potentially leading to a denial of service condition on affected devices.

Technical Details of CVE-2020-3327

Vulnerability Description

The vulnerability lies in the ARJ archive parsing module in ClamAV software versions 0.102.2.
It allows an unauthenticated, remote attacker to trigger a denial of service by exploiting a heap buffer overflow read.

Affected Systems and Versions

Product: ClamAV
Vendor: Cisco
Versions affected: < 0.102.3 (unspecified/custom)

Exploitation Mechanism

Attacker sends a specially crafted ARJ file to the target device.
Exploiting the vulnerability can crash the ClamAV scanning process, causing a denial of service.

Mitigation and Prevention

Immediate Steps to Take

Apply the security patch released by ClamAV to address the vulnerability.
Monitor vendor advisories and apply updates promptly.

Long-Term Security Practices

Regularly update ClamAV software to the latest version.
Implement network security measures to prevent unauthorized access.

Patching and Updates

Refer to vendor advisories for patch availability and installation instructions.