CWE-551 Details

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.

Einführungsmodi

Implementation : REALIZATION: This weakness is caused during implementation of an architectural security tactic.

Anwendbare Plattformen

Sprache

Class: Not Language-Specific (Undetermined)

Technologien

Class: Not Technology-Specific (Undetermined)
Class: Web Based (Undetermined)
Name: Web Server (Undetermined)

Häufige Konsequenzen

Mögliche Gegenmaßnahmen

Phases : Architecture and Design
URL Inputs should be decoded and canonicalized to the application's current internal representation before being validated and processed for authorization. Make sure that your application does not decode the same input twice. Such errors could be used to bypass allowlist schemes by introducing dangerous inputs after they have been checked.

Hinweise zur Schwachstellen-Zuordnung

Begründung : This CWE entry is at the Base level of abstraction, which is a preferred level of abstraction for mapping to the root causes of vulnerabilities.
Kommentar : Carefully read both the name and description to ensure that this mapping is an appropriate fit. Do not try to 'force' a mapping to a lower-level Base/Variant simply to comply with this preferred level of abstraction.

Einreichung

Änderungen