CVE-2020-26569 : Exploit Details and Defense Strategies
Learn about CVE-2020-26569, a vulnerability in EVPN VxLAN setups in Arista EOS that could lead to incorrect forwarding of packets across VLAN boundaries, potentially resulting in discarded traffic. Find out affected versions and mitigation steps.
A vulnerability in EVPN VxLAN setups in Arista EOS could allow incorrect forwarding of packets across VLAN boundaries, potentially leading to traffic being discarded.
Understanding CVE-2020-26569
This CVE affects specific versions of Arista EOS in EVPN VxLAN setups, potentially causing incorrect MAC to IP bindings and VLAN boundary issues.
What is CVE-2020-26569?
In EVPN VxLAN setups in Arista EOS, malformed packets can cause incorrect MAC to IP bindings, leading to misdirected packets across VLANs and potential traffic discard.
The Impact of CVE-2020-26569
The vulnerability can result in packets being incorrectly forwarded across VLAN boundaries, potentially causing traffic to be discarded on the receiving VLAN.
Technical Details of CVE-2020-26569
This section provides detailed technical information about the vulnerability.
Vulnerability Description
The vulnerability in EVPN VxLAN setups in Arista EOS allows specific malformed packets to create incorrect MAC to IP bindings, leading to misdirected packets and potential traffic discard.
Affected Systems and Versions
- Versions 4.21.12M and below in the 4.21.x train
- Versions 4.22.7M and below in the 4.22.x train
- Versions 4.23.5M and below in the 4.23.x train
- Versions 4.24.2F and below in the 4.24.x train
Exploitation Mechanism
The vulnerability is exploited by sending specific malformed packets in EVPN VxLAN setups, triggering incorrect MAC to IP bindings and VLAN boundary issues.
Mitigation and Prevention
Protect your systems from CVE-2020-26569 with these mitigation strategies.
Immediate Steps to Take
- Apply vendor-supplied patches or updates promptly
- Monitor network traffic for any signs of exploitation
- Implement network segmentation to limit the impact of potential attacks
Long-Term Security Practices
- Regularly update and patch all software and firmware
- Conduct security assessments and audits periodically to identify vulnerabilities
- Educate network administrators and users on best security practices
Patching and Updates
Ensure timely installation of patches and updates provided by Arista to address the vulnerability in affected versions of EOS.