CVE-2021-0294 : Exploit Details and Defense Strategies
Discover the details of CVE-2021-0294, a vulnerability in Juniper Networks Junos OS version 18.4R2-S5 affecting QFX5000 Series and EX4600 Series devices when configured with 'forwarding-options storm-control enhanced'. Learn about the impact, affected systems, and mitigation steps.
A vulnerability in Juniper Networks Junos OS version 18.4R2-S5 affects QFX5000 Series and EX4600 Series devices when configured with 'forwarding-options storm-control enhanced', leading to a partial Denial of Service. Attackers can exploit this issue to cause high CPU usage or packet loss by sending a large amount of broadcast or unknown unicast packets.
Understanding CVE-2021-0294
This CVE highlights a vulnerability in Junos OS versions impacting specific Juniper Networks devices due to inconsistent implementation of a function.
What is CVE-2021-0294?
The vulnerability in Junos OS version 18.4R2-S5 affects QFX5000 Series and EX4600 Series, allowing attackers to disrupt storm control mechanisms, potentially leading to a partial Denial of Service.
The Impact of CVE-2021-0294
This vulnerability can be exploited by malicious actors to cause high CPU usage or packet loss issues on affected devices by sending a large volume of specific packets.
Technical Details of CVE-2021-0294
The vulnerability arises from an inconsistent implementation of a function on Juniper Networks QFX5000 Series and EX4600 Series devices when configured with 'storm-control enhanced'.
Vulnerability Description
The flaw prevents the installation of the enhanced storm control filter group, rendering storm control ineffective and enabling potential DoS attacks.
Affected Systems and Versions
Junos OS 18.4R2-S5 on QFX5000 Series and EX4600 Series devices are specifically impacted by this vulnerability.
Exploitation Mechanism
Attackers can exploit this issue by flooding the devices with a high volume of broadcast or unknown unicast packets.
Mitigation and Prevention
To address this issue:
Immediate Steps to Take
Users are advised to update to Junos OS 18.4R2-S6 to mitigate the vulnerability.
Long-Term Security Practices
Regularly updating the software and monitoring for security advisories can help safeguard against such vulnerabilities.
Patching and Updates
Juniper Networks has released Junos OS 18.4R2-S6 as a solution to resolve the specific vulnerability.