TENEX contains a flaw that may allow a local attacker to more trivially guess user passwords. By carefully examining the virtual memory paging timing for differential timing for page faults, it is possible to determine if a specific character matched a portion of the password. By performing this timing attack for each character of a password, an attacker could effectively brute force a relatively strong password in a matter of minutes, instead of having to exhaust a majority of the possible password space.
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