CVE-2020-5136 Explained : Impact and Mitigation

A buffer overflow vulnerability in SonicOS allows an authenticated attacker to cause Denial of Service (DoS) in the SSL-VPN and virtual assist portal, leading to a firewall crash.

Understanding CVE-2020-5136

This CVE involves a buffer overflow vulnerability in SonicOS that can be exploited by an authenticated attacker.

What is CVE-2020-5136?

CVE-2020-5136 is a vulnerability in SonicOS that enables an authenticated attacker to trigger a Denial of Service (DoS) in the SSL-VPN and virtual assist portal, resulting in a firewall crash.

The Impact of CVE-2020-5136

The vulnerability can lead to a firewall crash, disrupting network operations and potentially causing service downtime.

Technical Details of CVE-2020-5136

This section provides technical details about the vulnerability.

Vulnerability Description

The buffer overflow vulnerability in SonicOS allows an authenticated attacker to execute a DoS attack in the SSL-VPN and virtual assist portal.

Affected Systems and Versions

SonicOS 6.5.4.7-79n and earlier
SonicOS 5.9.1.7-2n and earlier
SonicOS 5.9.1.13-5n and earlier
SonicOS 6.5.1.11-4n and earlier
SonicOS 6.0.5.3-93o and earlier
SonicOSv 6.5.4.4-44v-21-794 and earlier
SonicOS 7.0.0.0-1

Exploitation Mechanism

The vulnerability can be exploited by an authenticated attacker to trigger a buffer overflow, leading to a DoS condition.

Mitigation and Prevention

Steps to mitigate and prevent exploitation of CVE-2020-5136.

Immediate Steps to Take

Apply patches provided by SonicWall promptly.
Monitor network traffic for any suspicious activity.
Restrict access to vulnerable services.

Long-Term Security Practices

Regularly update and patch SonicOS to address security vulnerabilities.
Conduct security assessments and penetration testing to identify and remediate weaknesses.

Patching and Updates

Install the latest updates and patches released by SonicWall to address CVE-2020-5136.