CWE-910: Use of Expired File Descriptor
The product uses or accesses a file descriptor after it has been closed.
How it's found
Use of Expired File Descriptor 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.
After a file descriptor for a particular file or device has been released, it can be reused. The code might not write to the original file, since the reused file descriptor might reference a different file or device.
Consequences
- Read Files or Directories: The program could read data from the wrong file.
- DoS: Crash, Exit, or Restart: Accessing a file descriptor that has been closed can cause a crash.
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-910?
The product uses or accesses a file descriptor after it has been closed.
How do you find Use of Expired File Descriptor?
Use of Expired File Descriptor 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-910?
Read Files or Directories: The program could read data from the wrong file. DoS: Crash, Exit, or Restart: Accessing a file descriptor that has been closed can cause a crash.
Does TurboPentest test for Use of Expired File Descriptor?
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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