CWE-570: Expression is Always False
The product contains an expression that will always evaluate to false.
How it's found
Expression is Always False 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.
Vulnerable vs. safe
isValidProduct = true;updateInventory(productNumber);
return;
isValidProduct = true;updateAccount(accountNumber, productNumber);
updateAccountOrder(accountNumber, productNumber);boolean isValidProduct = false;boolean isValidAccount = false;if (validProductNumber(productNumber)) {}else {}if (validAccountNumber(accountNumber)) {}if (isValidProduct && isValidAccount) {}public void updateUserAccountOrder(String productNumber, String accountNumber) {}isValidAccount = true;updateAccount(accountNumber, productNumber);...if (validAccountNumber(accountNumber)) {}...Consequences
- Quality Degradation, Varies by Context
Mitigations
- Implementation: Consider refactoring the code, or determine if the code is not including a condition that could cause the expression to become false.
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-570?
The product contains an expression that will always evaluate to false.
How do you find Expression is Always False?
Expression is Always False 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-570?
Quality Degradation, Varies by Context
Does TurboPentest test for Expression is Always False?
This weakness is not covered by the automated black-box pentest. IntegSec pentesters cover it in a manual engagement.
Related CWEs
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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