Microsoft issues first security bulletins of 2003

A security bug in a network service that ships as part of Windows NT 4.0, Windows 2000 and Windows XP can open systems up to attack, Microsoft warned in its first security bulletin of the year, issued on Wednesday and rated "critical."

The software vendor also issued the second and third bulletins of 2003 at the same time. Bulletin MS03-002 details a flaw in Content Management Server 2001 rated "important" and MS03-003 offers a patch for a "moderate" vulnerability in Outlook 2002.

The "critical" flaw lies in the Microsoft Locator service, software used to map easy-to-remember logical names of systems on a company's network, such as a print server, to the actual network addresses, Microsoft said in security bulletin MS03-001. (http://www.microsoft.com/technet/security/bulletin/MS03-001.asp)

By default, the Locator service is enabled only on Windows 2000 and Windows NT 4.0 server configurations used as domain controllers. It is not enabled on Windows NT 4.0 workstations or servers, on Windows 2000 workstations or servers, or on Windows XP, Microsoft said.

An attacker could take over a vulnerable system by sending a malformed request to the Locator service, Microsoft said. However, a firewall set to block external NetBIOS traffic would prevent attacks from the Internet, the company said.

Nevertheless, Microsoft urges users of all the affected operating systems to apply the available software patch. Administrators of Windows 2000 and Windows NT 4.0 domain controllers should apply the patch immediately, Microsoft said.

Users can check to see whether the Locator service is running on their system by typing "net start" at the command line. The Locator service is running if the entry "Remote Procedure Call (RPC) Locator" appears in the displayed the list of services.

Bulletin MS03-002 details a serious flaw in Content Management Server 2001, a product used to build and manage Web sites. It contains a flaw that could allow an attacker to intercept data that an Internet user shares with a site created using the Microsoft software and alter the data shown to the user, the software maker said. (http://www.microsoft.com/technet/security/bulletin/MS03-002.asp)

To exploit the flaw, an attacker would have to make a user visit the target site through a link that adds malicious script. This could be done by sending that link in an e-mail, Microsoft said. Content Management Server 2002 is not affected, according to the vendor.

Finally, MS03-003 discusses a flaw in the way Outlook 2002 handles V1 Exchange Server Security Certificates for e-mail encryption. As a result of this flaw, Outlook does not correctly encrypt mail when such certificates are selected and sends plain text messages instead of secured messages, Microsoft warned. (http://www.microsoft.com/technet/security/bulletin/MS03-003.asp)

The scope of this vulnerability is limited because V1 Exchange Server Security certificates are not commonly used, according to Microsoft. Outlook 2002 by default uses the widely used S/MIME certificates, the company said.

Microsoft changed the way it rates security issues late last year. Under the new system, fewer bulletins get the "critical" stamp. Only vulnerabilities that could be exploited to allow malicious Internet worms to spread without user action are now rated critical. Many issues that were previously rated critical are now "important," a new category in the rating system. These "important" vulnerabilities could still expose user data or threaten system resources.

Join the newsletter!

Or

Sign up to gain exclusive access to email subscriptions, event invitations, competitions, giveaways, and much more.

Membership is free, and your security and privacy remain protected. View our privacy policy before signing up.

Error: Please check your email address.
Keep up with the latest tech news, reviews and previews by subscribing to the Good Gear Guide newsletter.

Joris Evers

PC World
Show Comments

Brand Post

Most Popular Reviews

Latest Articles

Resources

PCW Evaluation Team

Tom Pope

Dynabook Portégé X30L-G

Ultimately this laptop has achieved everything I would hope for in a laptop for work, while fitting that into a form factor and weight that is remarkable.

Tom Sellers

MSI P65

This smart laptop was enjoyable to use and great to work on – creating content was super simple.

Lolita Wang

MSI GT76

It really doesn’t get more “gaming laptop” than this.

Jack Jeffries

MSI GS75

As the Maserati or BMW of laptops, it would fit perfectly in the hands of a professional needing firepower under the hood, sophistication and class on the surface, and gaming prowess (sports mode if you will) in between.

Taylor Carr

MSI PS63

The MSI PS63 is an amazing laptop and I would definitely consider buying one in the future.

Christopher Low

Brother RJ-4230B

This small mobile printer is exactly what I need for invoicing and other jobs such as sending fellow tradesman details or step-by-step instructions that I can easily print off from my phone or the Web.

Featured Content

Product Launch Showcase

Don’t have an account? Sign up here

Don't have an account? Sign up now

Forgot password?