Microsoft Uncovers Exchange Server 5.5 Vulnerability

By Larry Seltzer  |  Posted 2004-08-10 Print this article Print

A flaw in the version, for which Microsoft has released a patch, could allow an attacker to execute code on other clients' systems.

A flaw in an old but still popular version of Microsoft Exchange Server could allow an attacker to execute code on other clients systems, according to a security bulletin released Tuesday by Microsoft, along with a patch for the flaw. The bulletin, designated MS04-026, was the sole new security bulletin Microsoft released Tuesday for the month of August. The single patch closely follows the public release of Windows XP Service Pack 2 (SP2).

The Exchange Server bulletin, which Microsoft deemed one of "moderate" severity, describes a potential remote code execution on Exchange 5.5 (SP4) through Outlook Web Access. Exchange Servers 2000 and 2003 are not vulnerable.
Proper use of authentication and secure network protocols to access Exchange Server make it more difficult to exploit, according to the bulletin.

But if an attacker were able to perform the attack, they could put spoofed content in the browser and proxy server caches of Outlook Web Access clients, and possibly cause the clients to perform cross-site scripting attacks.

The company on Tuesday also revised a security bulletin issued one month ago relating to a local privilege elevation vulnerability in the POSIX subsystems of Windows NT 4 and Windows 2000. The modification notes that Microsoft INTERIX 2.2 is also vulnerable.

Microsoft had issued an out-of-sequence security bulletin July 30 along with a cumulative update for Internet Explorer addressing the problems detailed in the bulletin. That bulletin addressed three critical problems that could allow attackers to compromise users systems.

Check out eWEEK.coms Security Center at for security news, views and analysis.

Be sure to add our security news feed to your RSS newsreader or My Yahoo page:  

Larry Seltzer has been writing software for and English about computers ever since—,much to his own amazement—,he graduated from the University of Pennsylvania in 1983.

He was one of the authors of NPL and NPL-R, fourth-generation languages for microcomputers by the now-defunct DeskTop Software Corporation. (Larry is sad to find absolutely no hits on any of these +products on Google.) His work at Desktop Software included programming the UCSD p-System, a virtual machine-based operating system with portable binaries that pre-dated Java by more than 10 years.

For several years, he wrote corporate software for Mathematica Policy Research (they're still in business!) and Chase Econometrics (not so lucky) before being forcibly thrown into the consulting market. He bummed around the Philadelphia consulting and contract-programming scenes for a year or two before taking a job at NSTL (National Software Testing Labs) developing product tests and managing contract testing for the computer industry, governments and publication.

In 1991 Larry moved to Massachusetts to become Technical Director of PC Week Labs (now eWeek Labs). He moved within Ziff Davis to New York in 1994 to run testing at Windows Sources. In 1995, he became Technical Director for Internet product testing at PC Magazine and stayed there till 1998.

Since then, he has been writing for numerous other publications, including Fortune Small Business, Windows 2000 Magazine (now Windows and .NET Magazine), ZDNet and Sam Whitmore's Media Survey.

Submit a Comment

Loading Comments...
Manage your Newsletters: Login   Register My Newsletters

Rocket Fuel