Description
The kbdint_next_device function in auth2-chall.c in sshd in OpenSSH through
6.9 does not properly restrict the processing of keyboard-interactive
devices within a single connection, which makes it easier for remote
attackers to conduct brute-force attacks or cause a denial of service (CPU
consumption) via a long and duplicative list in the ssh
-oKbdInteractiveDevices option, as demonstrated by a modified client that
provides a different password for each pam element on this list.