CWE-431: Missing Handler
A handler is not available or implemented.
How it's found
Missing Handler 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.
When an exception is thrown and not caught, the process has given up an opportunity to decide if a given failure or event is worth a change in execution.
Consequences
- Varies by Context
Mitigations
- Implementation: Handle all possible situations (e.g. error condition).
- Implementation: If an operation can throw an Exception, implement a handler for that specific exception.
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-431?
A handler is not available or implemented.
How do you find Missing Handler?
Missing Handler 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-431?
Varies by Context
Does TurboPentest test for Missing Handler?
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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