CWE-1109: Use of Same Variable for Multiple Purposes
The code contains a callable, block, or other code element in which the same variable is used to control more than one unique task or store more than one instance of data.
How it's found
Use of Same Variable for Multiple Purposes is typically found by tracing untrusted input from where it enters the system to the point where it is used without the check or neutralization this weakness describes, combining manual code review with dynamic testing.
Consequences
- Reduce Maintainability: This issue makes it more difficult to maintain the product, which indirectly affects security by making it more difficult or time-consuming to find and/or fix vulnerabilities. It also might make it easier to introduce vulnerabilities.
- Increase Analytical Complexity: Use of the same variable for multiple purposes can make it more difficult for a person to read or understand the code, potentially hiding other quality issues.
Where this fits in a TurboPentest engagement
This weakness is not covered by the automated black-box pentest. IntegSec pentesters cover it in a manual engagement.
Frequently asked questions
What is CWE-1109?
The code contains a callable, block, or other code element in which the same variable is used to control more than one unique task or store more than one instance of data.
How do you find Use of Same Variable for Multiple Purposes?
Use of Same Variable for Multiple Purposes is typically found by tracing untrusted input from where it enters the system to the point where it is used without the check or neutralization this weakness describes, combining manual code review with dynamic testing.
What is the impact of CWE-1109?
Reduce Maintainability: This issue makes it more difficult to maintain the product, which indirectly affects security by making it more difficult or time-consuming to find and/or fix vulnerabilities. It also might make it easier to introduce vulnerabilities. Increase Analytical Complexity: Use of the same variable for multiple purposes can make it more difficult for a person to read or understand the code, potentially hiding other quality issues.
Does TurboPentest test for Use of Same Variable for Multiple Purposes?
This weakness is not covered by the automated black-box pentest. IntegSec pentesters cover it in a manual engagement.
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Written and reviewed by
Michel Chamberland - Founder & CEO, IntegSec
CISSP, OSCP, OSCE, CEH, GIAC, CCSK · 20+ years in offensive security
Michel has spent 20+ years on offensive security teams including IBM X-Force Red and Trustwave SpiderLabs, leading penetration tests, red team engagements, and breach response for Fortune 500 customers. He is the founder of IntegSec and the architect of TurboPentest.
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