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CWE-551 - Incorrect Behavior Order: Authorization Before Parsing and Canonicalization

CWE-551

  • Abstraction:
  • Base
  • Structure:
  • Simple
  • Status:
  • Incomplete
Weakness Name

Incorrect Behavior Order: Authorization Before Parsing and Canonicalization

Description

If a web server does not fully parse requested URLs before it examines them for authorization, it may be possible for an attacker to bypass authorization protection.

For instance, the character strings /./ and / both mean current directory. If /SomeDirectory is a protected directory and an attacker requests /./SomeDirectory, the attacker may be able to gain access to the resource if /./ is not converted to / before the authorization check is performed.

Common Consequences

Scope: Access Control

Impact: Bypass Protection Mechanism

Related Weaknesses
  • Release Date:
  • 2006-07-19
  • Latest Modification Date:
  • 2023-06-29

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