CWE-785: Use of Path Manipulation Function without Maximum-sized Buffer
The product invokes a function for normalizing paths or file names, but it provides an output buffer that is smaller than the maximum possible size, such as PATH_MAX.
How it's found
Use of Path Manipulation Function without Maximum-sized Buffer is a specific, narrowly defined instance of a broader pattern. Testers confirm it with targeted code review and a proof-of-concept input that exercises the exact code path this weakness describes.
Passing an inadequately-sized output buffer to a path manipulation function can result in a buffer overflow. Such functions include realpath(), readlink(), PathAppend(), and others.
Consequences
- Modify Memory, Execute Unauthorized Code or Commands, DoS: Crash, Exit, or Restart
Mitigations
- Implementation: Always specify output buffers large enough to handle the maximum-size possible result from path manipulation functions.
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-785?
The product invokes a function for normalizing paths or file names, but it provides an output buffer that is smaller than the maximum possible size, such as PATH_MAX.
How do you find Use of Path Manipulation Function without Maximum-sized Buffer?
Use of Path Manipulation Function without Maximum-sized Buffer is a specific, narrowly defined instance of a broader pattern. Testers confirm it with targeted code review and a proof-of-concept input that exercises the exact code path this weakness describes.
What is the impact of CWE-785?
Modify Memory, Execute Unauthorized Code or Commands, DoS: Crash, Exit, or Restart
Does TurboPentest test for Use of Path Manipulation Function without Maximum-sized Buffer?
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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