Description
On affected platforms running Arista EOS where a tunnel decapsulation configuration—such as VXLAN (Virtual Extensible LAN), decap-groups, or a GRE (Generic Routing Encapsulation) tunnel interface—is present, the switch will incorrectly decapsulate and forward other unexpected tunneled packet with a destination IP matching its configured decapsulation IP. This occurs because the switch does not verify the tunnel protocol type, potentially leading to the unexpected processing of non-configured tunnel traffic. This issue has been reported as being exploited in the wild.
Problem types
CWE-1023: Incomplete Comparison with Missing Factors
Product status
4.36.0 (custom)
4.35.0 (custom)
4.34.0 (custom)
4.33.0 (custom)
4.32.0 (custom)
4.31.0 (custom)
* (custom)
Credits
Scott Christiansen, Lukas Peitz, Rich Compton, and Jonathan Davis at Comcast
References
www.arista.com/...rity-advisory/22872-security-advisory-0137