The Backend Engineering Show with Hussein Nasser

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

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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.

    3. Resources

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

    0:00

    0:20 UDP Proxy Crash

    2:15 Incorrect Downstream Remote Address

    ...more
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    The Backend Engineering Show with Hussein NasserBy Hussein Nasser
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