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In Linux system penetration testing, which system log file could be used to gain user login credentials of other users.
/var/log/messages
/var/log/wtmp
/var/log/btmp
/var/log/utmp
/var/log/mail
/var/log/lastlog
btmp: if it exists, this file contains failed login attempts, which could include passwords if a user accidentally types their password at a "login:" prompt. For this reason, btmp logging is recommended to not be used. Edit: Question is wrong btmp contains failed login attempts. So how that can be used to login when the credential is wrong.
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