Microsoft patches 15 bugs, nukes more SSL certificates

Officially ships security updates four days after leaking detailed info

The company also dealt with more fallout from the June hack of DigiNotar by flipping the "kill switch" on SSL (secure socket layer) certificates issued by Dutch certificate authority, or CA.

But none of the information Microsoft released today about the five updates or the 15 bugs was news: On Friday, the company leaked drafts of the security bulletins, the term Microsoft uses for the advisories that accompany each update.

All of the updates and vulnerabilities were rated "important," the second-most-serious rating in the company's four-step system.

Two of the vulnerabilities are in Windows; five are in Excel, the spreadsheet included with Office; two involve non-application Office components; and six affect SharePoint and associated software, such as Groove and Office Web Apps.

Of the 15, two are "DLL load hijacking" vulnerabilities, a term that describes a class of bugs first revealed in August 2010. Microsoft has been patching its software to fix the problem -- which can be exploited by tricking an application into loading a malicious file with the same name as a required dynamic link library, or DLL -- since last November.

Apparently that job isn't finished: Microsoft has yet to close a 2010 advisory that warns users of DLL load hijacking bugs in the company's software.

The update users should deploy first is MS11-072, which includes bug fixes for all supported versions of Excel, including the newest Excel 2010 on Windows and Excel 2011 on the Mac, several security professionals said today.

"The Excel one because of the attack vector, through malformed files," said Andrew Storms, director of security operations at nCircle Security, when asked which update should move to the top of the list.

Others experts agreed.

"Top priority should be given to MS11-072, which fixes an arbitrary code execution vulnerability in Excel," said Wolfgang Kandek, the chief technology officer for Qualys, in an email. "It affects all versions of Excel including the most recent 2010 version...[and] to exploit this issue, attackers could create malicious Excel files, which, when opened on vulnerable hosts, can take control of the system."

"Excel-related email attachments and links have commonly been used in attacks on organizations and this one should be addressed," added Kurt Baumgartner, senior security researcher at Kaspersky Lab.

Other updates quashed bugs in WINS (Windows Internet Name Service), a component of Windows Server last fixed in May; and patched a cross-site scripting vulnerability in SharePoint Server 2010, Microsoft's collaboration software.

Alongside the five updates, Microsoft delivered yet another update to deal with the theft of more than 500 digital certificates from DigiNotar.

"We are releasing another update, adding six additional DigiNotar root certificates that are cross-signed...to the Untrusted Certificate Store," said Pete Voss, a spokesman for Microsoft's Trustworthy Computing group, in a blog post.

Cross-signed certificates are those that DigiNotar issued, but then had co-signed by another CA -- in this case Entrust or GTE -- to allow them to be used by Windows PCs or browsers which were not already equipped with a DigiNotar certificate.

Certificates issued by Entrust or GTE will not be affected by the today's update, said Storms.

Microsoft and others, including rival browser makers Google and Mozilla, and operating system competitor Apple, have scrambled for the last two weeks to block or ban DigiNotar certificates.

Today's ban expansion came a week after Microsoft blocked others on Windows XP, Vista and Windows 7.

September's security patches can be downloaded and installed via the Microsoft Update and Windows Update services, as well as through Windows Server Update Services.

Gregg Keizer covers Microsoft, security issues, Apple, Web browsers and general technology breaking news for Computerworld. Follow Gregg on Twitter at @gkeizer, on Google+ or subscribe to Gregg's RSS feed. His e-mail address is gkeizer@computerworld.com.

See more articles by Gregg Keizer.

Tags patchessecurityMicrosoft

Keep up with the latest tech news, reviews and previews by subscribing to the Good Gear Guide newsletter.

Gregg Keizer

Computerworld (US)

Comments

Comments are now closed.

Most Popular Reviews

Follow Us

Best Deals on GoodGearGuide

Shopping.com

Latest News Articles

Resources

GGG Evaluation Team

Kathy Cassidy

STYLISTIC Q702

First impression on unpacking the Q702 test unit was the solid feel and clean, minimalist styling.

Anthony Grifoni

STYLISTIC Q572

For work use, Microsoft Word and Excel programs pre-installed on the device are adequate for preparing short documents.

Steph Mundell

LIFEBOOK UH574

The Fujitsu LifeBook UH574 allowed for great mobility without being obnoxiously heavy or clunky. Its twelve hours of battery life did not disappoint.

Andrew Mitsi

STYLISTIC Q702

The screen was particularly good. It is bright and visible from most angles, however heat is an issue, particularly around the Windows button on the front, and on the back where the battery housing is located.

Simon Harriott

STYLISTIC Q702

My first impression after unboxing the Q702 is that it is a nice looking unit. Styling is somewhat minimalist but very effective. The tablet part, once detached, has a nice weight, and no buttons or switches are located in awkward or intrusive positions.

Latest Jobs

Shopping.com

Don’t have an account? Sign up here

Don't have an account? Sign up now

Forgot password?