CWE-188 依赖数据/内存布局

admin 2022年1月5日21:01:20CWE(弱点枚举)评论13 views2029字阅读6分45秒阅读模式

CWE-188 依赖数据/内存布局

Reliance on Data/Memory Layout

结构: Simple

Abstraction: Base

状态: Draft

被利用可能性: Low

基本描述

The software makes invalid assumptions about how protocol data or memory is organized at a lower level, resulting in unintended program behavior.

扩展描述

When changing platforms or protocol versions, in-memory organization of data may change in unintended ways. For example, some architectures may place local variables A and B right next to each other with A on top; some may place them next to each other with B on top; and others may add some padding to each. The padding size may vary to ensure that each variable is aligned to a proper word size.

In protocol implementations, it is common to calculate an offset relative to another field to pick out a specific piece of data. Exceptional conditions, often involving new protocol versions, may add corner cases that change the data layout in an unusual way. The result can be that an implementation accesses an unintended field in the packet, treating data of one type as data of another type.

相关缺陷

  • cwe_Nature: ChildOf cwe_CWE_ID: 1105 cwe_View_ID: 1000 cwe_Ordinal: Primary

  • cwe_Nature: ChildOf cwe_CWE_ID: 435 cwe_View_ID: 1000

适用平台

Language: [{'cwe_Name': 'C', 'cwe_Prevalence': 'Undetermined'}, {'cwe_Name': 'C++', 'cwe_Prevalence': 'Undetermined'}]

常见的影响

范围 影响 注释
['Integrity', 'Confidentiality'] ['Modify Memory', 'Read Memory'] Can result in unintended modifications or exposure of sensitive memory.

可能的缓解方案

['Implementation', 'Architecture and Design']

策略:

In flat address space situations, never allow computing memory addresses as offsets from another memory address.

Architecture and Design

策略:

Fully specify protocol layout unambiguously, providing a structured grammar (e.g., a compilable yacc grammar).

Testing

策略:

Testing: Test that the implementation properly handles each case in the protocol grammar.

示例代码

In this example function, the memory address of variable b is derived by adding 1 to the address of variable a. This derived address is then used to assign the value 0 to b.

bad C

void example() {

char a;
char b;
*(&a + 1) = 0;

}

Here, b may not be one byte past a. It may be one byte in front of a. Or, they may have three bytes between them because they are aligned on 32-bit boundaries.

分类映射

映射的分类名 ImNode ID Fit Mapped Node Name
CLASP Reliance on data layout

引用

文章来源于互联网:scap中文网

特别标注: 本站(CN-SEC.COM)所有文章仅供技术研究,若将其信息做其他用途,由用户承担全部法律及连带责任,本站不承担任何法律及连带责任,请遵守中华人民共和国安全法.
  • 我的微信
  • 微信扫一扫
  • weinxin
  • 我的微信公众号
  • 微信扫一扫
  • weinxin
admin
  • 本文由 发表于 2022年1月5日21:01:20
  • 转载请保留本文链接(CN-SEC中文网:感谢原作者辛苦付出):
                  CWE-188 依赖数据/内存布局 http://cn-sec.com/archives/612843.html

发表评论

匿名网友 填写信息

:?: :razz: :sad: :evil: :!: :smile: :oops: :grin: :eek: :shock: :???: :cool: :lol: :mad: :twisted: :roll: :wink: :idea: :arrow: :neutral: :cry: :mrgreen: