Improper Control of Dynamically-Identified Variables

Opis

The product does not properly restrict reading from or writing to dynamically-identified variables.

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.

Skutki

• 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

Zapobieganie

• Implementation · Input Validation

  For any externally-influenced input, check the input against an allowlist of internal program variables that are allowed to be modified.

• Implementation, Architecture and Design · Refactoring

  Refactor the code so that internal program variables do not need to be dynamically identified.

Przykłady podatności

• CVE-2006-7135 extract issue enables file inclusion
• CVE-2006-7079 Chain: extract used for register_globals compatibility layer, enables path traversal (CWE-22)
• CVE-2007-0649 extract() buried in include files makes post-disclosure analysis confusing; original report had seemed incorrect.
• CVE-2006-6661 extract() enables static code injection
• CVE-2006-2828 import_request_variables() buried in include files makes post-disclosure analysis confusing
• CVE-2009-0422 Chain: Dynamic variable evaluation allows resultant remote file inclusion and path traversal.
• CVE-2007-2431 Chain: dynamic variable evaluation in PHP program used to modify critical, unexpected $_SERVER variable for resultant XSS.
• CVE-2006-4904 Chain: dynamic variable evaluation in PHP program used to conduct remote file inclusion.
• CVE-2006-4019 Dynamic variable evaluation in mail program allows reading and modifying attachments and preferences of other users.

Słabość nadrzędna

• CWE-99 Improper Control of Resource Identifiers ('Resource Injection')
• CWE-913 Improper Control of Dynamically-Managed Code Resources

Słabości podrzędne

• CWE-621 Variable Extraction Error
• CWE-627 Dynamic Variable Evaluation

Kiedy powstaje

• Implementation

Dotyczy

Not Language-Specific, Interpreted