IQID:21946 HTTP EmbedThis GoAhead Web Server 5.1.1 Digest Authentication Bypass S

IQID: 21946 - October 2020

A security vulnerability affecting GoAhead versions 2 to 5 has been identified when using Digest authentication over HTTP. The HTTP Digest Authentication in the GoAhead web server does not completely protect against replay attacks. This allows an unauthenticated remote attacker to bypass authentication via capture-replay if TLS is not used to protect the underlying communication channel. Digest authentication uses a 'nonce' value to mitigate replay attacks. GoAhead versions 3 to 5 validated the nonce with a fixed duration of 5 minutes which permitted short-period replays. This duration is too long for most implementations.

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