CWE-420: Unprotected Alternate Channel
The product protects a primary channel, but it does not use the same level of protection for an alternate channel.
How it's found
Unprotected Alternate Channel 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.
Vulnerable vs. safe
assign addr_auth = (address == 32'hF00) ? 1: 0;assign addr_auth = (address == 32'hF00 || address == 32'h800F00) ? 1: 0;Consequences
- Gain Privileges or Assume Identity, Bypass Protection Mechanism
Mitigations
- Architecture and Design: Identify all alternate channels and use the same protection mechanisms that are used for the primary channels.
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-420?
The product protects a primary channel, but it does not use the same level of protection for an alternate channel.
How do you find Unprotected Alternate Channel?
Unprotected Alternate Channel 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-420?
Gain Privileges or Assume Identity, Bypass Protection Mechanism
Does TurboPentest test for Unprotected Alternate Channel?
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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