CWE-293: Using Referer Field for Authentication
The referer field in HTTP requests can be easily modified and, as such, is not a valid means of message integrity checking.
How it's found
Using Referer Field for Authentication 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.
Consequences
- Gain Privileges or Assume Identity: Actions, which may not be authorized otherwise, can be carried out as if they were validated by the server referred to.
Mitigations
- Architecture and Design: In order to usefully check if a given action is authorized, some means of strong authentication and method protection must be used. Use other means of authorization that cannot be simply spoofed. Possibilities include a username/password or certificate.
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-293?
The referer field in HTTP requests can be easily modified and, as such, is not a valid means of message integrity checking.
How do you find Using Referer Field for Authentication?
Using Referer Field for Authentication 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-293?
Gain Privileges or Assume Identity: Actions, which may not be authorized otherwise, can be carried out as if they were validated by the server referred to.
Does TurboPentest test for Using Referer Field for Authentication?
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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