CWE-181 不正确的行为次序：在过滤之前验证
Incorrect Behavior Order: Validate Before Filter
结构: Simple
Abstraction: Base
状态: Draft
被利用可能性: unkown
基本描述
The software validates data before it has been filtered, which prevents the software from detecting data that becomes invalid after the filtering step.
扩展描述
This can be used by an attacker to bypass the validation and launch attacks that expose weaknesses that would otherwise be prevented, such as injection.
相关缺陷
-
cwe_Nature: ChildOf cwe_CWE_ID: 20 cwe_View_ID: 699 cwe_Ordinal: Primary
-
cwe_Nature: ChildOf cwe_CWE_ID: 179 cwe_View_ID: 1000 cwe_Ordinal: Primary
适用平台
Language: {'cwe_Class': 'Language-Independent', 'cwe_Prevalence': 'Undetermined'}
常见的影响
| 范围 | 影响 | 注释 |
|---|---|---|
| Access Control | Bypass Protection Mechanism |
可能的缓解方案
['Implementation', 'Architecture and Design']
策略:
Inputs should be decoded and canonicalized to the application's current internal representation before being filtered.
示例代码
例
This script creates a subdirectory within a user directory and sets the user as the owner.
bad PHP
if(strpos($dirName,'..') !== false){
return;
}
//filter out '~' because other scripts identify user directories by this prefix
$dirName = str_replace('~','',$dirName);
$newDir = $userDir . $dirName;
mkdir($newDir, 0700);
chown($newDir,$userName);
}
While the script attempts to screen for '..' sequences, an attacker can submit a directory path including ".~.", which will then become ".." after the filtering step. This allows a Path Traversal (CWE-21) attack to occur.
分析过的案例
| 标识 | 说明 | 链接 |
|---|---|---|
| CVE-2002-0934 | Directory traversal vulnerability allows remote attackers to read or modify arbitrary files via invalid characters between two . (dot) characters, which are filtered and result in a ".." sequence. | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2002-0934 |
| CVE-2003-0282 | Directory traversal vulnerability allows attackers to overwrite arbitrary files via invalid characters between two . (dot) characters, which are filtered and result in a ".." sequence. | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2003-0282 |
Notes
分类映射
| 映射的分类名 | ImNode ID | Fit | Mapped Node Name |
|---|---|---|---|
| PLOVER | Validate-Before-Filter | ||
| OWASP Top Ten 2004 | A1 | CWE More Specific | Unvalidated Input |
相关攻击模式
- CAPEC-120
- CAPEC-267
- CAPEC-3
- CAPEC-43
- CAPEC-78
- CAPEC-79
- CAPEC-80
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