Microsoft Tries to Keep Patch Available Despite Coming Attack

Techies at Microsoft Corp. have been working double time this week trying to make sure that

customers can still get to needed software patches despite the coming of the Blaster worm’s

Distributed Denial-of-Service (DDoS) attack.

The attack, which is expected to start tonight, is aimed at Microsoft’s windowsupdate.com

Web site — the site users have been sent to for the patch that will ward off the Blaster

worm. Microsoft execs want to make sure that system patching continues even after the attack

begins.

”we’ve been working nonstop to make sure we can provide the patch to our customers and we

think we’ll be able to,” says Stephen Toulouse, a security program manager in Microsoft’s

Security Response Center. ”Our number one concern is getting customers the patch and making

sure they can get to our site.”

To that end, Toulouse says Microsoft is guiding users to the patch through an alternate

route. Customers can get to it by going to www.microsoft.com/security. That site won’t be

affected even if the windowsupdate.com site goes offline during an attack.

Toulouse adds that they’ve taken steps to ward off the attack and keep the site up and

running, but he would not give specifics for fear that the information would help future

virus writers.

He adds that even though Microsoft is frequently the target of DDoS attacks and has practice

guarding against them, he can’t be sure the site won’t experience problems once the Blaster

attack hits full force.

”Denial-of-Service attacks tend to be successful because they’re brute force attacks,”

says Toulouse. ”It’s always one of those things where we’ll know when it happens.”

Microsoft has logged an increase in traffic to the windowsupdate.com site over the past

several hours, Toulouse says, adding that some customers had their computer clocks

misconfigured so their DoS attacks came early. But he expects to see the traffic flow to the

site increase steadily over the course of the day today and tomorrow.

”We’ve just been preparing as if it’s going to start any moment,” says Toulouse.

The Blaster worm was first detected on Monday. It quickly spread from machine to machine

across the globe through a flaw in the Windows operating system. But the worm doesn’t carry

a destructive payload, only causing a small percentage of infected computers to reboot

because of a flaw in its own coding.

Instead, Blaster, otherwise known as LovSan and Poza, is specifically aimed at causing

trouble for Microsoft. The worm is geared to harvest as many vulnerable systems as possible

and launch a DDoS attack on the windowsupdate.com Web site starting late Friday or early

Saturday morning. By focusing all the net congestion on that Web site, the author of the

worm is deliberately trying to make it difficult for IT managers and individual users to

download the patch they need to secure their systems against the worm.

Several anti-virus and security companies, including Symantec Corp., raised the worm’s

threat level to their second-highest rating earlier this week, despite the fact that the

number of new infections had leveled off or even slowed. Blaster has not caused much network

congestion and hasn’t affected Internet traffic on anything but a very localized scale.

But analysts say it’s the potential they’re worried about.

Blaster exploits a flaw with the Remote Procedure Call (RPC) process, which controls

activities such as file sharing. The flaw enables the attacker to gain full access to the

system. The vulnerability itself, which affects Windows NT, Windows 2000, Windows 2003 and

Windows XP machines, affects both servers and desktops, expanding the reach of any exploit

that takes advantage of it.

Where the vulnerability affects servers and desktops in such popular operating systems,

there are potentially millions of vulnerable computers out there right now. The security

industry sent out a widespread warning about two weeks ago, spurring many companies to

install the necessary patch, which was available from Microsoft almost a month ago.

And with millions of systems still unpatched, Microsoft is determined to make sure customers

are able to get onto their Web site and download the needed fix.

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