First Windows 7 Zero-Day Exploit Airs, But Danger Isn't Great For Most
November 13, 2009 9:15 AM
comment(s) - last by
Problems with SMB have persisted since Windows 7's RC phase
Windows 7 is arguably much more secure than its predecessor, Windows Vista, with
more robust memory protections
against attacks and with the wide availability of Microsoft's free antivirus suite,
Microsoft Security Essentials
. Many possibly exploitable vulnerabilities were found and removed during the unprecedented public testing phase as well.
However, challenges remain for Windows 7. A recent report found that the OS's UAC was less robust than Vista's and allowed
7 of 10 pieces of malware
to be freely installed. Now, following Microsoft's monthly Patch Tuesday a familiar problem has returned.
The Windows SMB (Server Message Block) protocol has had problems ever since the discovery during the OS's public testing phase of a
supposedly show-stopping bug
that could, according to some sources, cause Windows 7 to blue screen. Now another SMB bug, which throws Windows 7 into an infinite loop forcing a reset, has reared its ugly head.
The bug was publicized by researcher Laurent Gaffie on the
Full Disclosure mailing list
Tyler Reguly, Lead Security Research Engineer of security firm nCircle, the vast majority of home users are unlikely to be threatened by the bug. The bug's main route of attack occurs when you type in the IP of a server in the search box and accidentally navigate to a Windows Share on a malicious server. As most casual users are unlikely to have a clue how to navigate to server shares or even know what server shares are, chances are they won't be affected.
The vulnerability applies to both Windows 7 and Windows Server 2008 R2. Currently there are no reports of attacks in the wild, but proof-of-concept attacks have been aired. One key thing that makes this bug unlikely to be largely used by hackers is that it is unable to grant any sort of system access and can, in essence, only be used to create annoyance -- forcing the user to reset their machine.
It is also extremely easy to block external SMB traffic to rule out the chance of it swamping your machine. Simply block ports 135 to 139 and 445 on your router or firewall and you'll prevent external SMB traffic from entering your system and potentially causing harm. While this bug seems relatively harmless, given the history of problems with the SMB since the test candidate phase, it seems a good idea to put these blocks in place if you don't need to use SMB traffic to external sources.
Even if you block the ports, there is still a remote chance that you could be affected, via viewing a webpage in Internet Explorer. States Mr. Gaffie, "There is an Internet Explorer-based attack vector. By including a file stored on a share in the HTML of the web page the flaw can be triggered. But, once again the result is a denial of service."
Using Firefox, Chrome, Opera, or other third-party browser may help negate this route of attack.
Microsoft is currently investigating the bug. It bills Windows 7 as its most secure operating system to date and has committed itself to fight tough in the war against malicious users.
This article is over a month old, voting and posting comments is disabled
RE: Who Cares?
11/13/2009 10:50:08 AM
His point was valid. He didn't have to use Apple as the example, virtually every piece of software out there is poorly coded, mostly because no one wants to scrap all their code and build a secure design from the ground up. If DailyTech reported every new flaw found in pieces of software you'd have a very hard time finding an actual news story.
You on the other hand are way out of line (IMO), ending your comment where the comma was would have served you well.
RE: Who Cares?
11/13/2009 12:16:57 PM
the discussion had to move to macs, otherwise flames would not be hot enough.
"If you mod me down, I will become more insightful than you can possibly imagine." -- Slashdot
Sophos Finds Windows 7 UAC Fails to Block 7 out of 10 Pieces of Malware
November 5, 2009, 2:03 PM
Microsoft Security Essentials Now Available
September 29, 2009, 11:50 AM
With Exploits on the Way, It's Critical Win 7 Testers Run Tool to Safeguard Their PCs
September 21, 2009, 9:51 PM
Windows 7's XP Mode Cripples Malware, Gives Attackers Headaches
September 14, 2009, 8:30 AM
WhatsUp with WhatsApp?
August 29, 2016, 5:23 AM
Fuchsia – Google’s New Open Source Operating System
August 17, 2016, 6:30 AM
Windows 10: End of an Era & A New Beginning
August 1, 2016, 9:59 AM
Free Windows 10 offer ends July 29th, 2016: 10 Reasons to Upgrade Immediately
July 22, 2016, 9:19 PM
Quick Note: Whoops, Microsoft Pushed Unwanted Windows 10 to Some Users
October 15, 2015, 9:04 PM
Quick Note: Windows 10 Insider Preview Build 10565 Fixes Boot Camp 6.0 Issues
October 13, 2015, 11:39 AM
Most Popular Articles
5 Cases for iPhone 7 and 7 iPhone Plus
September 18, 2016, 10:08 AM
No More Turtlenecks - Try Snakables
September 19, 2016, 7:44 AM
ADHD Diagnosis and Treatment in Children: Problem or Paranoia?
September 19, 2016, 5:30 AM
Walmart may get "Robot Shopping Carts?"
September 17, 2016, 6:01 AM
Automaker Porsche may expand range of Panamera Coupe design.
September 18, 2016, 11:00 AM
Latest Blog Posts
Who is in Risk of Getting Oral Cancer?
Sep 23, 2016, 6:02 AM
France Bans Plastic Eating Utensils in Restaurants
Sep 18, 2016, 10:49 AM
Progress Against Acute Myeloid Leukemia
Sep 17, 2016, 5:30 AM
Apple Watch Series 2 - Number 1 in the Customer Satisfaction.
Sep 7, 2016, 6:19 PM
First Self-Driving Car debut on the streets of Singapore
Aug 28, 2016, 4:10 PM
More Blog Posts
Copyright 2016 DailyTech LLC. -
Terms, Conditions & Privacy Information