full-disclosure - Re: OpenSSH 3.5p1 Remote Root Exploit for FreeBSD

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Date: Fri, 1 Jul 2011 16:38:18 +1000
From: Darren Tucker <dtucker@....com.au>
To: "HI-TECH ." <isowarez.isowarez.isowarez@...glemail.com>
Cc: full-disclosure@...ts.grok.org.uk, bugtraq@...urityfocus.com
Subject: Re: OpenSSH 3.5p1 Remote Root Exploit for FreeBSD

This seems to be in libopie rather than sshd or libpam and happens
when the username is longer than OPIE_PRINCIPAL_MAX.  I'm not sure
exactly where inside libopie it is, but commenting out pam_opie.so
seems to prevent it.

http://www.freebsd.org/cgi/cvsweb.cgi/src/lib/libpam/modules/pam_opie/pam_opie.c?annotate=1.26
prevents usernames longer than OPIE_PRINCIPAL_MAX from being accepted
by pam_opie.

-- 
Darren Tucker (dtucker at zip.com.au)
GPG key 8FF4FA69 / D9A3 86E9 7EEE AF4B B2D4  37C9 C982 80C7 8FF4 FA69
    Good judgement comes with experience. Unfortunately, the experience
usually comes from bad judgement.

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