We have some Metasploit freshness for you today: A new zero-day exploit for Internet Explorer 7, 8, and 9 on Windows XP, Vista and 7. Computers can get compromised simply by visiting a malicious website, which gives the attacker the same privileges as the current user. Since Microsoft has not released a patch for this vulnerability yet, Internet users are strongly advised to switch to other browsers, such as Chrome or Firefox, until a security update becomes available. The exploit had already been used by malicious attackers in the wild before it was published in Metasploit. The associated vulnerability puts about 41% of Internet users in North America and 32% world-wide at risk (source: StatCounter). We have added the zero-day exploit module to Metasploit to give the security community a way to test if their systems are vulnerable and to develop counter-measures.
Here’s the back story: Some of you may remember that a couple of weeks ago, the Metasploit exploit team released a blog regarding a new Java exploit (CVE-2012-4681), with a blog entry titled “Let’s Start the Week with a New Java 0day in Metasploit“. You’d think the 0-day attack from the same malicious group might cool down a little after that incident… well, you’d be wrong. …
BOLD and COLOR emphasis mine.
I am sure that they only tested IE7, IE8 and IE9 initially on this because those are the only IE browsers in use right now for Windows XP, Vista and Windows 7 and based on the w3Counter, the largest number of IE users at this time.
He also said that if he were to test IE10, he was certain it would fail the test as well.
One can only imagine how miserably IE6, as the highest level of IE that works on Win2K, would do. You would think that most people have moved onto newer versions of Windows, but some have not sadly despite the fact that Win2K hasn’t had an update since I think July 2010 and despite articles like this one from Ed Bott January 16, 2010. Don’t think it’s a big issue? Well according to the IE6Countdown website, IE6 still has an impressive 6% of Internet users worldwide as of August 2012.
Sure the USA’s piece of pie for IE6 is only 0.04% but I know a few of those folks and they are diehard users who refuse to leave a dead OS and browser due to economic issues, or sight issues, or both. Now, to their credit, some of these Win2K users do have a NAT hardware router, a software firewall, and they use Firefox and not IE6, but still, Win2K has not had any updates since July 2010! Not a wise move.
Personally, I have NO addons allowed to work in IE8 in Windows XP by default on the Installations of Windows XP SP3 that I have still running, or IE9 on Windows 7.
I lock down my other browsers with no scripting type extensions like NoScript on Firefox, Chrome, etc. regardless of the operating system I am using (Windows, Mac, Linux), as well as Adblock Plus.
Another great little program for Windows that can help you keep a handle on what is happening on your Windows computer is BillP Studio’s WinPatrol Plus and FREE WinPatrol. I use it on my WinXP SP3 as an added protection since I have a laptop that can only run WinXP (SP3 of course), I use very intermittently for special use tasks such as setting up routers, or downloading music using Amazon Downloader, or sites that use OverDrive Media Console, etc. which won’t run on Linux on my laptop. This is when I am on the road using Library or Starbucks, or other public wifi hotspots due to our bandwidth limitations here at home on Verizon Wireless.
And I have found it to be wise to use a different browser (locked down of course as much as you can tolerate), rather than the ‘ubiquitous’ browser (IE in Windows, Safari on the Mac, or whatever the default browser is in a given GUI in Linux) in any given operating system.
One can not leave this to chance these days, IMHO.
EDIT: Added articles – one more about the exploit and the link to information on Microsoft’s workaround:
Customers can use the Enhanced Mitigation Experience Toolkit (EMET) 3.0 to harden IE enough to ward off the current attacks, said Wee, of the company’s Trustworthy Computing Group, in an email late on Monday.EMET 3.0 can be downloaded from Microsoft’s websites.
Microsoft has reacted fast by issuing a security advisory yesterday, in which it confirms the existence of the flaw in Internet explorer 9 and all previous versions (IE10 is not affected), and offers instructions on steps the users can take to mitigate – but not yet remove – the threat:
- Deploy the Enhanced Mitigation Experience Toolkit (EMET) and configure it for Internet Explorer
- Set Internet and Local intranet security zone settings to “High” to block ActiveX Controls and Active Scripting in these zones
- Configure Internet Explorer to prompt before running Active Scripting or to disable Active Scripting in the Internet and Local intranet security zone.
These steps could bring additional problems to the users, such as being bombarded by a slew of security warnings, so until Microsoft releases a definitive patch for the hole, maybe it would be easier for IE users to take Rapid7’s advice and switch to another browser for the time being.
Again BOLD emphasis mine.