OpenSSH 6.9 Keyboard-Interactive Device Processing Vulnerability

CVE-2015-5600 · HIGH Severity

AV:N/AC:L/AU:N/C:P/I:N/A:C

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.

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