COMMON WEAKNESS ENUMERATIONIncomplete

CWE-915

Improperly Controlled Modification of Dynamically-Determined Object Attributes

The product receives input from an upstream component that specifies multiple attributes, properties, or fields that are to be initialized or updated in an object, but it does not properly control which attributes can be modified.

Soyutlama

Base

Yapı

Simple

Sömürü İhtimali

Medium

Problemi anla

Problem nedir?

The product receives input from an upstream component that specifies multiple attributes, properties, or fields that are to be initialized or updated in an object, but it does not properly control which attributes can be modified.

Genişletilmiş açıklama

If the object contains attributes that were only intended for internal use, then their unexpected modification could lead to a vulnerability. This weakness is sometimes known by the language-specific mechanisms that make it possible, such as mass assignment, autobinding, or object injection.

Terminoloji

Alternatif adlar ve kullanım biçimleri

Mass Assignment

"Mass assignment" is the name of a feature in Ruby on Rails that allows simultaneous modification of multiple object attributes.

AutoBinding

The "Autobinding" term is used in frameworks such as Spring MVC and ASP.NET MVC.

PHP Object Injection

Some PHP application researchers use this term for attacking unsafe use of the unserialize() function, but it is also used for CWE-502.

Kök neden

Problem nasıl ve ne zaman oluşur?

Yaşam döngüsü evresi

Architecture and Design

Yaşam döngüsü evresi

Implementation

Risk

Başarılı sömürü neye yol açar?

Modify Application Data

Etkilenen güvenlik alanları: Integrity

An attacker could modify sensitive data or program variables.
Execute Unauthorized Code or Commands

Etkilenen güvenlik alanları: Integrity

Varies by ContextAlter Execution Logic

Etkilenen güvenlik alanları: Other, Integrity

Savunma

Nasıl önlenir ve çözülür?

Implementation

Uygulama aşaması savunması

Detay
If available, use features of the language or framework that allow specification of allowlists of attributes or fields that are allowed to be modified. If possible, prefer allowlists over denylists. For applications written with Ruby on Rails, use the attr_accessible (allowlist) or attr_protected (denylist) macros in each class that may be used in mass assignment.

Architecture and Design · Implementation

Birden fazla yaşam döngüsü evresinde uygulanacak savunma

Detay
If available, use the signing/sealing features of the programming language to assure that deserialized data has not been tainted. For example, a hash-based message authentication code (HMAC) could be used to ensure that data has not been modified.

Implementation

Input Validation

Detay
For any externally-influenced input, check the input against an allowlist of internal object attributes or fields that are allowed to be modified.

Implementation · Architecture and Design

Refactoring

Detay
Refactor the code so that object attributes or fields do not need to be dynamically identified, and only expose getter/setter functionality for the intended attributes.

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.)