CVE-2020-6084 : Exploit Details and Defense Strategies

An exploitable denial of service vulnerability exists in the ENIP Request Path Logical Segment functionality of Allen-Bradley Flex IO 1794-AENT/B 4.003. A specially crafted network request can cause a loss of communications with the device resulting in denial-of-service. An attacker can send a malicious packet to trigger this vulnerability by sending an Electronic Key Segment with fewer bytes than required by the Key Format Table.

Understanding CVE-2020-6084

This CVE involves a denial of service vulnerability in Allen-Bradley Flex IO 1794-AENT/B 4.003.

What is CVE-2020-6084?

The vulnerability allows an attacker to disrupt communications with the device by sending a specially crafted network request, leading to denial-of-service.

The Impact of CVE-2020-6084

The vulnerability has a CVSS base score of 7.5 (High) with a high impact on availability. It does not affect confidentiality or integrity but can result in a loss of service.

Technical Details of CVE-2020-6084

This section provides more technical insights into the vulnerability.

Vulnerability Description

The vulnerability is due to a flaw in the ENIP Request Path Logical Segment functionality of Allen-Bradley Flex IO 1794-AENT/B 4.003, allowing for a denial-of-service attack.

Affected Systems and Versions

Product: Allen-Bradley Flex IO 1794-AENT/B 4.003

Exploitation Mechanism

Attack Complexity: Low
Attack Vector: Network
Privileges Required: None
User Interaction: None
Scope: Unchanged
Exploitation involves sending a malicious packet with insufficient bytes in the Electronic Key Segment.

Mitigation and Prevention

Protecting systems from CVE-2020-6084 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply vendor patches or updates promptly to mitigate the vulnerability.
Implement network segmentation to limit the impact of potential attacks.

Long-Term Security Practices

Regularly monitor network traffic for any unusual patterns that may indicate an attack.
Conduct security assessments and penetration testing to identify and address vulnerabilities proactively.

Patching and Updates

Stay informed about security advisories from the vendor and apply patches as soon as they are available.