The kbdint_next_device function in auth2-chall.c in sshd in OpenSSH up to and including 6.9 does not properly restrict the processing of keyboard-interactive devices within a single connection, which makes it easier for remote malicious users 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.
| Vulnerable Product | Search on Vulmon | Subscribe to Product |
|---|---|---|
openbsd openssh |
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