Webex Meeting Manager Buffer Overflow in ActiveX Control Lets Remote Users Execute Arbitrary Code
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SecurityTracker Alert ID: 1020641
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SecurityTracker URL: http://securitytracker.com/id?1020641
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CVE Reference: CVE-2008-2737
(Links to External Site)
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Updated: Aug 15 2008
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Original Entry Date: Aug 7 2008
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Impact: Execution of arbitrary code via network, User access via network
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Fix Available: Yes
Vendor Confirmed: Yes
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Advisory: Cisco Security Advisory
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Version(s): control version 20.2008.2601.4928
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Description: A vulnerability was reported in Webex Meeting Manager. A remote user can cause arbitrary code to be executed on the target user's system.
A remote user can create specially crafted HTML that, when loaded by the target user, will invoke an ActiveX control and trigger
a buffer overflow in the 'atucfobj' module to execute arbitrary code on the target system. The code will run with the privileges
of the target user.
The CLSID of the vulnerable control is: 32E26FD9-F435-4A20-A561-35D4B987CFDC
The vendor was notified on
June 20, 2008.
Elazar Broad reported this vulnerability.
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Impact: A remote user can create HTML that, when loaded by the target user, will execute arbitrary code on the target user's system.
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Solution: The vendor has issued a fixed version (20.2008.2606.4919) of the affected control. The fix will be downloaded when the user joins
a meeting.
The vendor's advisory is available at:
http://www.cisco.com/warp/public/707/cisco-sa-20080814-webex.shtml
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Vendor URL: www.cisco.com/warp/public/707/cisco-sa-20080814-webex.shtml (Links to External Site)
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Cause: Boundary error
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Underlying OS: Windows (Any)
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Reported By: "Elazar Broad" <elazar@hushmail.com>
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Message History:
None.
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Source Message Contents
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Date: Wed, 06 Aug 2008 13:20:02 -0400
From: "Elazar Broad" <elazar@hushmail.com>
Subject: [Full-disclosure] Webex atucfobj Module ActiveX Control Buffer
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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
Who:
Webex
http://www.webex.com/
What:
Webex Meeting Manager
http://support.webex.com/support/downloads.html
How:
The Webex Meeting Manager utilizes several ActiveX controls, one of
which is vulnerable to a stack based buffer overflow. The atucfobj
Module contains a single method called NewObject() who's only
parameter is vulnerable to this issue.
This issue has been confirmed in version 20.2008.2601.4928, prior
versions are believed to vulnerable as well.
atucfobj.dll version 20.2008.2601.4928
{32E26FD9-F435-4A20-A561-35D4B987CFDC}
Fix:
The vendor has released version 20.2008.2606.4919 of this control,
which fixes this issue. The control should be updated when the user
joins a meeting.
Workaround:
Set the killbit for the affected control. See
http://support.microsoft.com/kb/240797
Credit:
When I reported this issue to the vendor, they had stated that they
were aware of it, but would not say whether it was the result of an
internal audit or an independent researcher.
Timeline:
06/20/2008 -> Issue reported to the vendor
06/21/2008 <- Vendor responds asking for further details
06/22/2008 -> Details sent with PoC
06/25/2008 <- Vendor responds stating that they are aware of this
issue
08/06/2008 - Disclosure
Elazar
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