CVE-2020-17355 : What You Need to Know

Arista EOS before 4.21.12M, 4.22.x before 4.22.7M, 4.23.x before 4.23.5M, and 4.24.x before 4.24.2F allows remote attackers to cause a denial of service by crafting a malformed DHCP packet.

Understanding CVE-2020-17355

This CVE involves a vulnerability in Arista EOS that could lead to a denial of service attack.

What is CVE-2020-17355?

Arista EOS versions mentioned are susceptible to a denial of service attack due to a flaw that allows remote attackers to disrupt the system by sending a specially crafted DHCP packet.

The Impact of CVE-2020-17355

The vulnerability can be exploited by attackers to cause a restart of agents, resulting in a denial of service condition for affected systems.

Technical Details of CVE-2020-17355

This section provides more technical insights into the vulnerability.

Vulnerability Description

Arista EOS versions before 4.21.12M, 4.22.x before 4.22.7M, 4.23.x before 4.23.5M, and 4.24.x before 4.24.2F are prone to a denial of service attack triggered by malformed DHCP packets.

Affected Systems and Versions

Arista EOS versions before 4.21.12M
Arista EOS 4.22.x before 4.22.7M
Arista EOS 4.23.x before 4.23.5M
Arista EOS 4.24.x before 4.24.2F

Exploitation Mechanism

Attackers can exploit this vulnerability by sending specially crafted DHCP packets, causing an incorrect route to be installed and leading to a denial of service condition.

Mitigation and Prevention

Protecting systems from this vulnerability requires specific actions.

Immediate Steps to Take

Apply the necessary patches provided by Arista to mitigate the vulnerability.
Monitor network traffic for any signs of DHCP packet manipulation.

Long-Term Security Practices

Regularly update and patch Arista EOS to prevent known vulnerabilities.
Implement network segmentation to limit the impact of potential attacks.

Patching and Updates

Ensure that affected Arista EOS versions are updated to versions that address this vulnerability.