Détail du CWE-473

CWE-473

PHP External Variable Modification
Draft
2006-07-19
00h00 +00:00
2023-06-29
00h00 +00:00
CWE Mitre.org
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Nom: PHP External Variable Modification

A PHP application does not properly protect against the modification of variables from external sources, such as query parameters or cookies. This can expose the application to numerous weaknesses that would not exist otherwise.

Informations générales

Modes d'introduction

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

Plateformes applicables

Langue

Name: PHP (Undetermined)

Conséquences courantes

Portée Impact Probabilité
IntegrityModify Application Data

Exemples observés

Références Description

CVE-2000-0860

File upload allows arbitrary file read by setting hidden form variables to match internal variable names.

CVE-2001-0854

Mistakenly trusts $PHP_SELF variable to determine if include script was called by its parent.

CVE-2002-0764

PHP remote file inclusion by modified assumed-immutable variable.

CVE-2001-1025

Modify key variable when calling scripts that don't load a library that initializes it.

CVE-2003-0754

Authentication bypass by modifying array used for authentication.

Mesures d’atténuation potentielles

Phases : Requirements // Implementation
Carefully identify which variables can be controlled or influenced by an external user, and consider adopting a naming convention to emphasize when externally modifiable variables are being used. An application should be reluctant to trust variables that have been initialized outside of its trust boundary. Ensure adequate checking is performed when relying on input from outside a trust boundary. Do not allow your application to run with register_globals enabled. If you implement a register_globals emulator, be extremely careful of variable extraction, dynamic evaluation, and similar issues, since weaknesses in your emulation could allow external variable modification to take place even without register_globals.

Notes de cartographie des vulnérabilités

Justification : This CWE entry is at the Variant level of abstraction, which is a preferred level of abstraction for mapping to the root causes of vulnerabilities.
Commentaire : 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.

Modèles d'attaque associés

CAPEC-ID Nom du modèle d'attaque
CAPEC-77 Manipulating User-Controlled Variables
This attack targets user controlled variables (DEBUG=1, PHP Globals, and So Forth). An adversary can override variables leveraging user-supplied, untrusted query variables directly used on the application server without any data sanitization. In extreme cases, the adversary can change variables controlling the business logic of the application. For instance, in languages like PHP, a number of poorly set default configurations may allow the user to override variables.

NotesNotes

This is a language-specific instance of Modification of Assumed-Immutable Data (MAID). This can be resultant from direct request (alternate path) issues. It can be primary to weaknesses such as PHP file inclusion, SQL injection, XSS, authentication bypass, and others.

Soumission

Nom Organisation Date Date de publication Version
PLOVER 2006-07-19 +00:00 2006-07-19 +00:00 Draft 3

Modifications

Nom Organisation Date Commentaire
Eric Dalci Cigital 2008-07-01 +00:00 updated Time_of_Introduction
CWE Content Team MITRE 2008-09-08 +00:00 updated Relationships, Other_Notes, Taxonomy_Mappings
CWE Content Team MITRE 2009-12-28 +00:00 updated Other_Notes, Relationship_Notes
CWE Content Team MITRE 2010-02-16 +00:00 updated Relationships
CWE Content Team MITRE 2011-06-01 +00:00 updated Common_Consequences
CWE Content Team MITRE 2012-05-11 +00:00 updated Relationships
CWE Content Team MITRE 2012-10-30 +00:00 updated Potential_Mitigations
CWE Content Team MITRE 2014-07-30 +00:00 updated Relationships
CWE Content Team MITRE 2017-11-08 +00:00 updated Modes_of_Introduction, Relationships
CWE Content Team MITRE 2020-02-24 +00:00 updated Relationships
CWE Content Team MITRE 2023-04-27 +00:00 updated Relationships
CWE Content Team MITRE 2023-06-29 +00:00 updated Mapping_Notes