CWE-253: Incorrect Check of Function Return Value
The product incorrectly checks a return value from a function, which prevents it from detecting errors or exceptional conditions.
How it's found
Incorrect Check of Function Return Value 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.
Important and common functions will return some value about the success of its actions. This will alert the program whether or not to handle any errors caused by that function.
Consequences
- Unexpected State, DoS: Crash, Exit, or Restart: An unexpected return value could place the system in a state that could lead to a crash or other unintended behaviors.
Mitigations
- Architecture and Design: Use a language or compiler that uses exceptions and requires the catching of those exceptions.
- Implementation: Properly check all functions which return a value.
- Implementation: When designing any function make sure you return a value or throw an exception in case of an error.
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-253?
The product incorrectly checks a return value from a function, which prevents it from detecting errors or exceptional conditions.
How do you find Incorrect Check of Function Return Value?
Incorrect Check of Function Return Value 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-253?
Unexpected State, DoS: Crash, Exit, or Restart: An unexpected return value could place the system in a state that could lead to a crash or other unintended behaviors.
Does TurboPentest test for Incorrect Check of Function Return Value?
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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