March 30, 2010
Microsoft Security Bulletin: March 30, 2010
Advisory Overview

March 30, 2010 - Qualys® Vulnerability R&D Lab has modified an existing vulnerability checks in QualysGuard® to protect organizations against a zero day vulnerability present in Microsoft Internet Explorer for which a patch was announced today. Customers can immediately audit their networks for this and other new vulnerabilities by accessing their QualysGuard subscription.

Vulnerability Details

Microsoft has released a security patch to fix zero day as well as other flaws in Internet Explorer.

Qualys has released the following checks for these new vulnerabilities:


Microsoft Internet Explorer Cumulative Security Update
SEVERITY: Urgent Urgent-5 5
QUALYS ID: 100078
VENDOR REFERENCE: KB979352
CVE REFERENCE: CVE-2009-4074 | CVE-2010-0027 | CVE-2010-0244 | CVE-2010-0245 | CVE-2010-0246 | CVE-2010-0247 | CVE-2010-0248 | CVE-2010-0249
CVSS SCORES: Base 7.5/ Temporal 6.2
THREAT: Microsoft Internet Explorer is a Web browser for Microsoft Windows.

Internet Explorer is prone to the following vulnerabilities:

An XSS filter bypass vulnerability exists in the way that Internet Explorer 8 disables an HTML attribute in otherwise appropriately filtered HTTP response data. The vulnerability could allow initially disabled scripts to run in the wrong security context, leading to information disclosure.(CVE-2009-4074).

A remote code execution vulnerability exists in the way that Internet Explorer incorrectly validates input. An attacker could exploit the vulnerability by constructing a specially crafted URL.An attacker who successfully exploited this vulnerability could gain the same user rights as the logged-on user.(CVE-2010-0027).

Multiple remote code execution vulnerabilities exists in the way that Internet Explorer accesses an object that has not been correctly initialized or has been deleted. An attacker could exploit these vulnerabilities by constructing a specially crafted Web page. When a user views the Web page, the vulnerability could allow remote code execution.(CVE-2010-0244, CVE-2010-0245,CVE-2010-0246,CVE-2010-0247,CVE-2010-0248,CVE-2010-0249).

Microsoft has released a security update that addresses these vulnerabilities by modifying the way that Internet Explorer handles objects in memory, validates input parameters, and filters HTML attributes.

The security update is rated Critical for all supported releases of Internet Explorer: Internet Explorer 5.01, Internet Explorer 6, Internet Explorer 6 Service Pack 1, Internet Explorer 7, and Internet Explorer 8 (except Internet Explorer 6 for supported editions of Windows Server 2003). For Internet Explorer 6 for supported editions of Windows Server 2003 as listed, this update is rated Moderate.

Windows XP Embedded Systems:- For additional information regarding security updates for embedded systems, refer to the following MSDN blog(s):

A Bag Full of Updates are now Available on ECE (KB978207)

Note: The Aurora exploit takes advantage of this vulnerability.

IMPACT: Successfully exploiting these vulnerabilities could allow a remote attacker to bypass some security restrictions or gain escalated privileges or cause remote code execution in context of affected product.
SOLUTION: Patch:
Following are links for downloading patches to fix the vulnerabilities:

Microsoft Windows 2000 Service Pack 4 (Internet Explorer 5.01 Service Pack 4)

Microsoft Windows 2000 Service Pack 4 (Internet Explorer 6 Service Pack 1)

Windows XP Service Pack 2 and Windows XP Service Pack 3 (Internet Explorer 6)

Windows XP Professional x64 Edition Service Pack 2 (Internet Explorer 6)

Windows Server 2003 Service Pack 2 (Internet Explorer 6)

Windows Server 2003 x64 Edition Service Pack 2 (Internet Explorer 6)

Windows Server 2003 with SP2 for Itanium-based Systems (Internet Explorer 6)

Windows XP Service Pack 2 and Windows XP Service Pack 3 (Internet Explorer 7)

Windows XP Professional x64 Edition Service Pack 2 (Internet Explorer 7)

Windows Server 2003 Service Pack 2 (Internet Explorer 7)

Windows Server 2003 x64 Edition Service Pack 2 (Internet Explorer 7)

Windows Server 2003 with SP2 for Itanium-based Systems (Internet Explorer 7)

For a complete list of patch download links, please refer to Microsoft Security Bulletin MS10-002. Also refer to Microsoft Security Advisory(979352) to obtain details about a zero day vulnerability that was patched by MS10-002.

Workarounds:
- Set Internet and Local intranet security zone settings to "High" to prompt before running ActiveX Controls and Active Scripting
- Configure Internet Explorer to prompt before running Active Scripting or to disable Active Scripting in the Internet and Local intranet security zone
- Enable DEP for Internet Explorer 6 Service Pack 2 or Internet Explorer 7. See Microsoft Knowledge Base Article 979352 to use the automated Microsoft Fix it solution to enable or disable this workaround.
- Enable or disable ActiveX controls in Office 2007
- Do not open untrusted Microsoft Office files

Refer to the advisory to obtain additional details on applying the workarounds.

This new vulnerability check is included in Qualys vulnerability signatures v1.26.28-3. Each QualysGuard account is automatically updated with the latest vulnerability signatures as they become available. To view the vulnerability signature version in your account, from the QualysGuard HOME menu, select the Account Info tab.

SELECTIVE SCAN INSTRUCTIONS USING QUALYSGUARD:

To perform a selective vulnerability scan, configure a scan profile to use the following options:

  1. Ensure access to TCP ports 135 and 139 are available.
  2. Enable Windows Authentication (specify Authentication Records).
  3. Enable the following Qualys IDs:
    • 100078
  4. If you would like the scan to return the Windows Hostname, also include QID 82044 and ensure access to UDP port 137 is available.
  5. If you would like to be notified if QualysGuard is unable to logon to a host (if Authentication fails), also include QID 105015.

In addition, prior to running a scan for these new vulnerabilities, you can estimate your exposure to these new threats by running the Risk Matrix Report, available from the QualysGuard HOME page.


Technical Support
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About QualysGuard
QualysGuard is an on-demand security audit service delivered over the web that enables organizations to effectively manage their vulnerabilities and maintain control over their network security with centralized reports, verified remedies, and full remediation workflow capabilities with trouble tickets. QualysGuard provides comprehensive reports on vulnerabilities including severity levels, time to fix estimates and impact on business, plus trend analysis on security issues. By continuously and proactively monitoring all network access points, QualysGuard dramatically reduces security managers' time researching, scanning and fixing network exposures and enables companies to eliminate network vulnerabilities before they can be exploited.

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