Podcasts Technology The Backend Engineering Show with Hussein Nasser Envoy Proxy Fixes Two Zero Day vulnerabilities (UDP Proxy, TCP Proxy)

Envoy Proxy Fixes Two Zero Day vulnerabilities (UDP Proxy, TCP Proxy)

Published: Nov. 22, 2020, 11:03 p.m.

The Envoy Proxy fixed two zero day vulnerabilities, from Envoy groups :

We are announcing the fixes for two zero days that were identified today:

  1. Crash in UDP proxy when datagram size is > 1500. This can happen if either MTU > 1500 or if fragmented datagrams are forwarded and reassembled: https://github.com/envoyproxy/envoy/pull/14122. This issue was already under embargo and a new issue was opened in public GitHub.
  2. Proxy proto downstream address not restored correctly for non-HTTP connections: https://github.com/envoyproxy/envoy/pull/14131. This issue was opened publicly recently but the security implications were not clear at the time. This will affect logging and network level RBAC for non-HTTP network connections.

Resources

https://groups.google.com/g/envoy-security-announce/c/aqtBt5VUor0

0:00

0:20 UDP Proxy Crash

2:15 Incorrect Downstream Remote Address

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