COMMON WEAKNESS ENUMERATIONDraft

CWE-625

Permissive Regular Expression

The product uses a regular expression that does not sufficiently restrict the set of allowed values.

Soyutlama

Base

Yapı

Simple

Sömürü İhtimali

Medium

Problemi anla

Problem nedir?

The product uses a regular expression that does not sufficiently restrict the set of allowed values.

Genişletilmiş açıklama

This effectively causes the regexp to accept substrings that match the pattern, which produces a partial comparison to the target. In some cases, this can lead to other weaknesses. Common errors include: - not identifying the beginning and end of the target string - using wildcards instead of acceptable character ranges - others

Kök neden

Problem nasıl ve ne zaman oluşur?

Yaşam döngüsü evresi

Implementation

This problem is frequently found when the regular expression is used in input validation or security features such as authentication.

Risk

Başarılı sömürü neye yol açar?

Bypass Protection Mechanism

Etkilenen güvenlik alanları: Access Control

Savunma

Nasıl önlenir ve çözülür?

Implementation

Uygulama aşaması savunması

Detay
When applicable, ensure that the regular expression marks beginning and ending string patterns, such as "/^string$/" for Perl.

Doğrulama

Nasıl tespit edilir?

Automated Static Analysis

High
Automated static analysis, commonly referred to as Static Application Security Testing (SAST), can find some instances of this weakness by analyzing source code (or binary/compiled code) without having to execute it. Typically, this is done by building a model of data flow and control flow, then searching for potentially-vulnerable patterns that connect "sources" (origins of input) with "sinks" (destinations where the data interacts with external components, a lower layer such as the OS, etc.)