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Message-ID: <46C23349.7070503@idefense.com> Date: Tue, 14 Aug 2007 18:57:13 -0400 From: iDefense Labs <labs-no-reply@...fense.com> To: vulnwatch@...nwatch.org, full-disclosure@...ts.grok.org.uk, bugtraq@...urityfocus.com Subject: iDefense Security Advisory 08.14.07: Microsoft XML Core Services XMLDOM Memory Corruption Vulnerability Microsoft XML Core Services XMLDOM Memory Corruption Vulnerability iDefense Security Advisory 08.14.07 http://labs.idefense.com/intelligence/vulnerabilities/ Aug 14, 2007 I. BACKGROUND XML Core Services (also known as MSXML) is a library for processing XML files. It works with, and was original part of, Internet Explorer. For more information visit the following URL. http://msdn2.microsoft.com/en-us/xml/default.aspx http://en.wikipedia.org/wiki/MSXML II. DESCRIPTION Remote exploitation of a buffer overflow vulnerability within Microsoft Corp.'s XML Core Services may allow an attacker to execute arbitrary code in the context of the current user. The vulnerability specifically exists in incorrect checking being performed on the length argument to the substringData() method of an XMLDOM object. When certain length values are supplied, a large region of memory is copied into a buffer of insufficient size. III. ANALYSIS Exploitation of this vulnerability requires an attacker to convince a user to open a page containing a malicious script. In testing by iDefense Labs, code execution was determined to be possible. Calling the vulnerable code with no other setup would simply cause the application to write (or sometimes read) past the end of the allocated memory and trigger an access violation exception. However, an attacker can cause pointers in use by another thread to be overwritten and may be able to execute code. IV. DETECTION iDefense confirmed the existence of this vulnerability using Internet Explorer 6.x on Windows XP SP2. It is suspected that other versions are also affected. V. WORKAROUND Disable active scripting, if it is not necessary for daily operations, using the following steps. 1. In IE, click on Tools and select Internet Options from the drop-down menu. 2. Click the Security tab and the Custom Level button. 3. Under Scripting, then Active Scripting, click the Disable radio button. VI. VENDOR RESPONSE Microsoft has addressed this vulnerability within Microsoft Security Bulletins MS07-042 and MS07-043. For more information, consult their bulletins at the following URLs. http://www.microsoft.com/technet/security/Bulletin/MS07-042.mspx http://www.microsoft.com/technet/security/Bulletin/MS07-043.mspx VII. CVE INFORMATION The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2007-2223 to this issue. This is a candidate for inclusion in the CVE list (http://cve.mitre.org/), which standardizes names for security problems. VIII. DISCLOSURE TIMELINE 05/17/2006 Initial vendor notification 05/17/2006 Initial vendor response 08/14/2007 Coordinated public disclosure IX. CREDIT The discoverer of this vulnerability wishes to remain anonymous. Get paid for vulnerability research http://labs.idefense.com/methodology/vulnerability/vcp.php Free tools, research and upcoming events http://labs.idefense.com/ X. LEGAL NOTICES Copyright © 2007 iDefense, Inc. Permission is granted for the redistribution of this alert electronically. It may not be edited in any way without the express written consent of iDefense. If you wish to reprint the whole or any part of this alert in any other medium other than electronically, please e-mail customerservice@...fense.com for permission. Disclaimer: The information in the advisory is believed to be accurate at the time of publishing based on currently available information. Use of the information constitutes acceptance for use in an AS IS condition. There are no warranties with regard to this information. Neither the author nor the publisher accepts any liability for any direct, indirect, or consequential loss or damage arising from use of, or reliance on, this information.
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