CWE-206: Internal Behavioral Inconsistency Information Leak
Internal Behavioral Inconsistency Information Leak
Weakness ID: 206 (Weakness Variant)
Status: Incomplete
Description
Description Summary
Two separate operations in a product cause the product to
behave differently in a way that is observable to an attacker and reveals
security-relevant information about the internal state of the product, such as
whether a particular operation was successful or not.
Behavioral infoleak in GUI allows attackers to
distinguish between alphanumeric and non-alphanumeric characters in a
password, thus reducing the search space.
Product immediately sends an error message when
user does not exist instead of waiting until the password is provided,
allowing username enumeration.
Potential Mitigations
Phase
Description
Compartmentalize your system to have "safe" areas where trust
boundaries can be unambiguously drawn. Do not allow sensitive data to go
outside of the trust boundary and always be careful when interfacing
with a compartment outside of the safe area.
Setup generic response pages for error condition. The error page
should not disclose information about the success or failure of a
sensitive operation. For instance, the login page should not confirm
that the login is correct and the password incorrect. The attacker who
tries random account name may be able to guess some of them. Confirming
that the account exists would make the login page more susceptible to
brute force attack.
Description
