First Exploitable Windows 7 Vulnerability Uncovered, Confirmed by Microsoft
Article by George Norman
On 17 Nov 2009
Researcher Laurent Gaffié has recently uncovered a zero-day vulnerability that affects the most recent version Windows, Windows 7. It should be mentioned that the vulnerability also affects Windows Server 2008 R2. According to Laurent Gaffié, the vulnerability, if exploited by a person with malicious intent, could allow that attacker to remotely crash Windows 7 (and/or Windows Server 2008 R2) on a LAN or via IE.

"Most secure Os ever”; what ever your firewall is set to, you can get remotely smashed via IE or even via some broadcasting nbns tricks (no user interaction). How funny,” commented Laurent Gaffié.

Advertising

Redmond-based software giant Microsoft has acknowledged the vulnerability and has provided additional details. As Microsoft reported, this is a Denial-of-Service (DoS) vulnerability that affects the Server Messaging Block (SMB) Protocol - SMBv1 and SMBv2. Only Windows 7 and Windows Server 2008 R2 are affected; Windows Vista, Windows Server 2008, Windows XP, Windows Server 2003 and Windows 2000 are in the clear.

“This vulnerability would not allow an attacker to take control or install malware on a user’s system, but could cause the affected system to stop responding until manually restarted. We are actively monitoring this situation to keep customers informed and will provide additional guidance as necessary. While we are not currently aware of active attacks, we continue to recommend customers review the mitigations and workarounds detailed in the Security Advisory to protect themselves as we work to develop a comprehensive security update,” explained Director with Microsoft Security Response Center (MSRC), Mike Reavey.

The security advisory Mike Reavey mentioned above is Security Advisory 977544. You can view it by clicking here.

Microsoft also mentioned that it is “concerned that this new report of a vulnerability was not responsibly disclosed, potentially putting computer users at risk”. But why would Laurent Gaffié publicly disclose the vulnerability in an irresponsible manner? It seems that the researcher did try to go through the proper channels, but that did not work out too well. Microsoft’s Security Response Center (MSRC) did not acknowledge his finding as a vulnerability that needs to be patched. Soon after Laurent Gaffié made he vulnerability public, MSRC scrambled to release Security Advisory 977544 and to post a workaround.

Here is the workaround provided by MSRC: “Block TCP ports 139 and 445 at the firewall. These ports are used to initiate a connection with the affected component. Blocking TCP ports 139 and 445 at the firewall will help protect systems that are behind that firewall from attempts to exploit this vulnerability. Microsoft recommends that you block all SMB communications to and from the Internet to help prevent attacks.”



Tags: Microsoft, Windows 7, Windows Server 2008 R2, Vulnerability, DoS, Denial-of-Service, SMB, Server Messaging Block
About the author: George Norman
George is a news editor.
You can follow him on Google+, Facebook or Twitter

I Hope you LIKE this blog post! Thank you!
What do YOU have to say about this
blog comments powered by Disqus
Popular News
By George Norman on 17 Aug 2017
With the blockbuster movie season upon us, Sony decided to celebrate the occasion with a sale: the Attack of the Blockbusters Sale that offers discounts of up to 50% (60% if you’re a PlayStation Plus member) on a ton of PS4 video games.
By George Norman on 17 Aug 2017
Samsung’s new T5 portable solid-state drive (PSSD) uses the latest 64-layer V-NAND technology, offers between 250GB and 2TB of storage capacity, has a lightweight and shock-resistant design that’s smaller than the average business card, and delivers industry-leading transfer speeds of up to 540 MB/s.
Related News
By George Norman on 19 Jun 2017
Don’t worry. I’m not going to rehash all those facts that everyone already knows about Bill Gates, like how he got arrested for driving without a license, that he is a college dropout, and that he plans to give most of his fortune to charity.
By George Norman on 31 Jul 2017
Microsoft has a new keyboard to offer: the new, premium quality Microsoft Modern Keyboard with Fingerprint ID. If you’re not familiar with it, then keep on reading and you’ll uncover pretty much everything there is to know about this keyboard.
By George Norman on 18 Jul 2017
Sure, text remains the main method of communicating with others when using a messenger application like Skype, but if you really want to get the message across, using an emoticon, emoji or sticker can’t hurt.
By George Norman on 07 Jun 2017
Yes, I know that the global PC market is in a downwards spiral for its nth quarter and that mobile usage is on the rise. Still, I argue that a desktop PC is better than all the other alternatives.
Sponsored Links
Hot Software Updates
Top Downloads
Become A Fan!
Link To Us!
First Exploitable Windows 7 Vulnerability Uncovered, Confirmed by Microsoft
HTML Linking Code