CVE-2020-5319 : Exploit Details and Defense Strategies

Dell EMC Unity, Dell EMC Unity XT, and Dell EMC UnityVSA versions prior to 5.0.2.0.5.009 contain a Denial of Service vulnerability on NAS Server SSH implementation that is used to provide SFTP service on a NAS server. A remote unauthenticated attacker may potentially exploit this vulnerability and cause a Denial of Service (Storage Processor Panic) by sending an out of order SSH protocol sequence.

Understanding CVE-2020-5319

This CVE involves a Denial of Service vulnerability in Dell EMC Unity products.

What is CVE-2020-5319?

CVE-2020-5319 is a vulnerability found in Dell EMC Unity, Dell EMC Unity XT, and Dell EMC UnityVSA versions prior to 5.0.2.0.5.009. It allows remote unauthenticated attackers to trigger a Denial of Service by manipulating the SSH protocol sequence.

The Impact of CVE-2020-5319

CVSS Base Score: 7.5 (High)
Attack Vector: Network
Attack Complexity: Low
Availability Impact: High
Privileges Required: None
Scope: Unchanged
This vulnerability can lead to a Storage Processor Panic, causing a Denial of Service.

Technical Details of CVE-2020-5319

This section provides more in-depth technical information about the vulnerability.

Vulnerability Description

The vulnerability arises from improper handling of SSH protocol sequences on NAS Server SSH implementation.

Affected Systems and Versions

Affected Product: Unity
Vendor: Dell
Affected Versions: Prior to 5.0.2.0.5.009
Version Type: Custom

Exploitation Mechanism

The vulnerability can be exploited by sending an out-of-order SSH protocol sequence, leading to a Denial of Service.

Mitigation and Prevention

Protecting systems from CVE-2020-5319 is crucial to maintaining security.

Immediate Steps to Take

Update affected Dell EMC Unity products to version 5.0.2.0.5.009 or later.
Monitor network traffic for any signs of exploitation.

Long-Term Security Practices

Implement strong network segmentation to limit the impact of potential attacks.
Regularly review and update security configurations to address new vulnerabilities.

Patching and Updates

Stay informed about security advisories from Dell and apply patches promptly to mitigate known vulnerabilities.