OpenPAM/SSHD privacy hole (FreeBSD 9.2+ affected)

[Patrick Proniewski]

On 27 oct. 2013, at 22:50, Andrei wrote:

> On Sun, 27 Oct 2013 22:33:56 +0100
> Dag-Erling Smørgrav <des at des.no> wrote:
> 
>> Andrei <az at azsupport.com> writes:
>>> In /etc/pam.d/sshd from:
>>> auth            required        pam_unix.so             no_warn
>>> try_first_pass to:
>>> auth required pam_unix.so no_warn try_first_pass authtok_prompt
>>> 
>>> Right?
>> 
>> auth required pam_unix.so no_warn try_first_pass
>> authtok_prompt="Password:"
>> 
>> BTW, I recently noticed that try_first_pass doesn't work as documented
>> (and hasn't for ten years), but I haven't had time to fix it yet.
> 
> You might be surprised, but authtok_prompt="Password:" have same results as
> just authtok_prompt. Empty screen and no "Password:" prompt.
> FreeBSD 9.2 tested.

Same here (9.2-RELEASE amd64), whatever I put for authtok_prompt.
The end of a verbose attempt reads: 

debug3: authmethod_lookup keyboard-interactive
debug3: remaining preferred: password
debug3: authmethod_is_enabled keyboard-interactive
debug1: Next authentication method: keyboard-interactive
debug2: userauth_kbdint
debug2: we sent a keyboard-interactive packet, wait for reply
debug2: input_userauth_info_req
debug2: input_userauth_info_req: num_prompts 1

and then, nothing.

patpro

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