CWE-914 动态识别变量的控制不恰当
Improper Control of Dynamically-Identified Variables
结构: Simple
Abstraction: Base
状态: Incomplete
被利用可能性: unkown
基本描述
The software does not properly restrict reading from or writing to dynamically-identified variables.
扩展描述
Many languages offer powerful features that allow the programmer to access arbitrary variables that are specified by an input string. While these features can offer significant flexibility and reduce development time, they can be extremely dangerous if attackers can modify unintended variables that have security implications.
相关缺陷
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cwe_Nature: ChildOf cwe_CWE_ID: 99 cwe_View_ID: 1000 cwe_Ordinal: Primary
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cwe_Nature: ChildOf cwe_CWE_ID: 99 cwe_View_ID: 699
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cwe_Nature: ChildOf cwe_CWE_ID: 913 cwe_View_ID: 1000
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cwe_Nature: ChildOf cwe_CWE_ID: 913 cwe_View_ID: 699 cwe_Ordinal: Primary
常见的影响
| 范围 | 影响 | 注释 |
|---|---|---|
| Integrity | Modify Application Data | An attacker could modify sensitive data or program variables. |
| Integrity | Execute Unauthorized Code or Commands | |
| ['Other', 'Integrity'] | ['Varies by Context', 'Alter Execution Logic'] |
可能的缓解方案
Implementation
策略: Input Validation
For any externally-influenced input, check the input against a white list of internal program variables that are allowed to be modified.
['Implementation', 'Architecture and Design']
策略: Refactoring
Refactor the code so that internal program variables do not need to be dynamically identified.
示例代码
例
This code uses the credentials sent in a POST request to login a user.
bad PHP
function login($user,$pass){
mysql_query($query);
if(getUserRole($user) == "Admin"){
}
}
$isAdmin = false;
extract($_POST);
login(mysql_real_escape_string($user),mysql_real_escape_string($pass));
The call to extract() will overwrite the existing values of any variables defined previously, in this case $isAdmin. An attacker can send a POST request with an unexpected third value "isAdmin" equal to "true", thus gaining Admin privileges.
分析过的案例
| 标识 | 说明 | 链接 |
|---|---|---|
| CVE-2006-7135 | extract issue enables file inclusion | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-7135 |
| CVE-2006-7079 | extract used for register_globals compatibility layer, enables path traversal | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-7079 |
| CVE-2007-0649 | extract() buried in include files makes post-disclosure analysis confusing; original report had seemed incorrect. | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-0649 |
| CVE-2006-6661 | extract() enables static code injection | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-6661 |
| CVE-2006-2828 | import_request_variables() buried in include files makes post-disclosure analysis confusing | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-2828 |
| CVE-2009-0422 | Chain: Dynamic variable evaluation allows resultant remote file inclusion and path traversal. | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-0422 |
| CVE-2007-2431 | Chain: dynamic variable evaluation in PHP program used to modify critical, unexpected $_SERVER variable for resultant XSS. | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-2431 |
| CVE-2006-4904 | Chain: dynamic variable evaluation in PHP program used to conduct remote file inclusion. | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-4904 |
| CVE-2006-4019 | Dynamic variable evaluation in mail program allows reading and modifying attachments and preferences of other users. | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-4019 |
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