K17113 : OpenSSH vulnerability CVE-2015-5600

Security Advisory 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. (CVE-2015-5600)
Impact
Remote attackers may be able to conduct brute-force attacks or cause a denial-of-service (DoS) by way of the ssh -oKbdInteractiveDevices option.