CWE-480: Use of Incorrect Operator
The product accidentally uses the wrong operator, which changes the logic in security-relevant ways.
How it's found
Use of Incorrect Operator 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.
These types of errors are generally the result of a typo by the programmer.
Vulnerable vs. safe
debug_mode_d = dcsr_q.ebreakm;riscv::PRIV_LVL_M: begin// check that we actually want to enter debug depending on the privilege level we are currently inunique case (priv_lvl_o)
debug_mode_d = dcsr_q.ebreaku;riscv::PRIV_LVL_U: begin
assign priv_lvl_o = (debug_mode_q || umode_i) ? riscv::PRIV_LVL_M : priv_lvl_q;
debug_mode_q <= debug_mode_d;module csr_regfile #(...............debug_mode_d = dcsr_q.ebreakm;riscv::PRIV_LVL_M: begin// check that we actually want to enter debug depending on the privilege level we are currently inunique case (priv_lvl_o)
debug_mode_d = dcsr_q.ebreaku;riscv::PRIV_LVL_U: begin
(debug_mode_q && umode_i) ? riscv::PRIV_LVL_M : priv_lvl_q;
assign priv_lvl_o =
debug_mode_q <= debug_mode_d;module csr_regfile #(...............Consequences
- Alter Execution Logic: This weakness can cause unintended logic to be executed and other unexpected application behavior.
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-480?
The product accidentally uses the wrong operator, which changes the logic in security-relevant ways.
How do you find Use of Incorrect Operator?
Use of Incorrect Operator 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-480?
Alter Execution Logic: This weakness can cause unintended logic to be executed and other unexpected application behavior.
Does TurboPentest test for Use of Incorrect Operator?
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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