CWE-294—Authentication Bypass by Capture-replay

Weakness Name

Authentication Bypass by Capture-replay

Description

A capture-replay flaw exists when the design of the product makes it possible for a malicious user to sniff network traffic and bypass authentication by replaying it to the server in question to the same effect as the original message (or with minor changes).

Capture-replay attacks are common and can be difficult to defeat without cryptography. They are a subset of network injection attacks that rely on observing previously-sent valid commands, then changing them slightly if necessary and resending the same commands to the server.

Common Consequences

Scope:

Access Control

Impact:

Gain Privileges or Assume Identity

Notes:

Messages sent with a capture-relay attack allow access to resources which are not otherwise accessible without proper authentication.

Related Weaknesses

• CWE-287Improper AuthenticationHigh
• CWE-1390Weak Authentication