Microsoft releases one security bulletin for November

by John McCormick | Nov 14, 2005 7:45:00 PM

Tags: John McCormick, security, MS05-053, vulnerability, Microsoft Windows, Graphics Rendering Engine, Microsoft Windows Metafile, Enhanced Metafile, Microsoft Corp., Graphics Rendering Engine vulnerability, IT Locksmith Newsletter

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Takeaway: After releasing nine security bulletins in October, Microsoft scaled back this month and released only one security bulletin. But don't let the 'cutback' fool you�MS05-053 addresses several vulnerabilities, two of which are critical. Get the details in this edition of the IT Locksmith.

Redmond stuck to its schedule this month and released its expected security update on the expected date. After an embarrassment of riches in October, when the software giant released nine security bulletins, Microsoft scaled back in November and released just one. However, the bulletin addresses several vulnerabilities, two of which are critical.

Details

Microsoft's security department kept to its schedule this month and released one security bulletin for the regularly scheduled November 8 deadline. Microsoft Security Bulletin MS05-053, "Vulnerabilities in Graphics Rendering Engine Could Allow Code Execution," addresses some new individual vulnerabilities as well as replaces both MS03-045 and MS05-002 for Windows XP Service Pack1 only.

MS05-053 addresses the following vulnerabilities:

Graphics Rendering Engine vulnerability: This is a remote code execution threat caused by a buffer overrun in the Windows Metafile and Enhanced Metafile image rendering engine (CAN-2005-2123). As of November 14, there have been no reports of exploits in the wild. Researchers had disclosed none of these vulnerabilities publicly prior to the release of the update.
Windows Metafile vulnerability: This is also a remote code execution threat caused by an unchecked buffer in the Windows Metafile image rendering engine (CAN-2005-2124). As of November 14, there have been no reports of exploits in the wild. Researchers had disclosed none of these vulnerabilities publicly prior to the release of the update.
Enhanced Metafile vulnerability: This is a denial of service threat with a maximum severity rating of moderate (CAN-2005-0803). The culprit is an unchecked buffer in the Enhanced Metafile image rendering engine. While proof of concept code has appeared on the Internet, Microsoft reports that it hasn't received any notification of actual attacks based on this vulnerability.

Microsoft Baseline Security Analyzer (MBSA) 1.2.1 and MBSA 2.0 will indicate if this update is necessary. In addition, Systems Management Server (SMS) will also detect whether the update is required and can help deploy this update.

Applicability

The threats generally affect Windows 2000 and later versions, including the 64-bit and Itanium editions.

The Graphics Rendering Engine vulnerability affects the following:

Windows 2000 SP4
All versions of Windows XP
All versions of Windows Server 2003

The Windows Metafile vulnerability and the Enhanced Metafile vulnerability affect the following:

Windows 2000 SP4
Windows XP SP1 (but not Windows XP SP2)
Windows Server 2003 (but not Windows Server 2003 SP1)

Risk level

Microsoft rates the Graphics Rendering Engine vulnerability as critical for all affected platforms. The Windows Metafile vulnerability is a critical threat for Windows 2000 SP4, Windows XP SP1, and Windows Server 2003; however, it is not a threat for Windows XP SP2 and Windows Server 2003 SP1.

The Enhanced Metafile vulnerability is only a moderate threat for Windows 2000 SP4, Windows XP SP1, and Windows Server 2003. This vulnerability poses no threat to Windows XP SP2 or Windows Server 2003 SP1. The severity ratings are the same for comparable 64-bit and Itanium-based versions.

Mitigating factors

Again, fully updated Windows XP and Windows Server 2003 operating systems are not vulnerable to two of the three threats included in this security bulletin. In addition, best practices�such as not randomly visiting strange Web sites and using e-mail only in text mode�can eliminate the threat from the critical Graphics Rendering Engine vulnerability. However, these best practices don't protect you from an embedded image in an Office document, but you can mitigate that threat by not opening documents from untrusted sources.

Fix

Install the update. According to Microsoft, fix the message length verification so it isn't as likely to cause other problems as more major patches sometimes do.

As a workaround for the most serious threat, the Graphics Rendering engine vulnerability, avoid untrusted Web sites that may contain malicious graphics files, and open all e-mails in text mode.

Final word

There's certain to be the usual flurry of complaints about Microsoft concerning this security bulletin, but it's only fair to point out that anyone following best practices�and enforcing those practices among the users they support�would probably have little exposure to these threats. It's sort of like having your identity stolen because you fell for a phishing scheme: You mostly have yourself to blame even though it makes you feel better to blame the vendor.

Although this patch is less likely to have unintended consequences than some of the major patches, keep in mind that any alteration to your system software has the potential to cause a problem with some poorly written application. Therefore, whenever possible, fully test any patch before installing it on a mission-critical system.

In other news, the European Union, China, and the United Nations are challenging ICANN and U.S. dominance of the Internet. The groups are calling for more international control over the naming of domains and so forth�in other words, the ability to censor just who and what goes on the Web.

And that's the topic for discussion this week: How do you feel about the way ICANN has managed the Internet�and especially freedom of speech�on the Web? Do you think China or the European Union would do a better job? And what do you think about just giving control of the Internet to the U.N.? After all, it has a lot of experience managing the world by committee�just look at the fine job the Security Council has done keeping peace in the world and administering the oil-for-food program in Iraq. Would you like to see it do the same kind of job on managing the Internet?

Also watch for�

While we're still in a relatively quiet malware period, it's important to note that a new Linux worm has surfaced. Lupper plants a backdoor on infected systems on UDP port 7222, and it degrades network performance by trying to find other Linux systems to infect on the Web. Since this is a backdoor threat, Symantec recommends that if you detect Lupper, reinstall the operating system to clean out any other changes that someone exploiting the backdoor may have made.
Microsoft has published Security Advisory 910550, which addresses the Macromedia Flash Player 7 vulnerability, because many Microsoft operating systems include Flash Player. For more information, see the Macromedia Security Bulletin.

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John McCormick is a security consultant and well-known author in the field of IT, with more than 17,000 published articles. He has written the IT Locksmith column for TechRepublic for more than four years.

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