CWE-471 对假设不可变数据的修改（MAID）

Modification of Assumed-Immutable Data (MAID)

结构: Simple

Abstraction: Base

状态: Draft

被利用可能性: unkown

基本描述

The software does not properly protect an assumed-immutable element from being modified by an attacker.

扩展描述

This occurs when a particular input is critical enough to the functioning of the application that it should not be modifiable at all, but it is. Certain resources are often assumed to be immutable when they are not, such as hidden form fields in web applications, cookies, and reverse DNS lookups.

适用平台

Language: {'cwe_Class': 'Language-Independent', 'cwe_Prevalence': 'Undetermined'}

常见的影响

范围	影响	注释
Integrity	Modify Application Data	Common data types that are attacked are environment variables, web application parameters, and HTTP headers.
Integrity	Unexpected State

可能的缓解方案

['Architecture and Design', 'Operation', 'Implementation']

策略:

When the data is stored or transmitted through untrusted sources that could modify the data, implement integrity checks to detect unauthorized modification, or store/transmit the data in a trusted location that is free from external influence.

示例代码

例

In the code excerpt below, an array returned by a Java method is modified despite the fact that arrays are mutable.

bad Java

String[] colors = car.getAllPossibleColors();
colors[0] = "Red";

分析过的案例

标识	说明	链接
CVE-2002-1757	Relies on $PHP_SELF variable for authentication.	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2002-1757
CVE-2005-1905	Gain privileges by modifying assumed-immutable code addresses that are accessed by a driver.	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-1905

Notes

Relationship MAID issues can be primary to many other weaknesses, and they are a major factor in languages that provide easy access to internal program constructs, such as PHP's register_globals and similar features. However, MAID issues can also be resultant from weaknesses that modify internal state; for example, a program might validate some data and store it in memory, but a buffer overflow could overwrite that validated data, leading to a change in program logic. Theoretical There are many examples where the MUTABILITY property is a major factor in a vulnerability.

分类映射

映射的分类名	ImNode ID	Fit	Mapped Node Name
PLOVER			Modification of Assumed-Immutable Data

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