Microsoft Security Bulletin MS11-003-Critical-kb2482017

Cumulative Security Update for Internet Explorer (2482017)

Version: 1.0

 

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Internet Explorer users warned of new zero-day attacks

 

Microsoft has warned users of all supported versions of the Internet Explorer browser that an unpatched vulnerability exists in the product that is being actively exploited by malicious hackers in targeted attacks.

 

The zero-day vulnerability, described in aMicrosoft’s security advisory, allows cybercriminals to execute code on remote users’ computers without their permission.

 

In other words, simply clicking on a link in an email could take you to a webpage which would silently install malicious code (such as a backdoor Trojan horse) onto your computer. In short, you could be one click away from having a hacker access your computer or comandeer it into being part of a botnet.

 

Sophos is adding detection of the malicious webapges as Mal/20103962-A, and the Trojan horse that we have seen being downloaded as Troj/GIFDldr-A.

 

According to Microsoft’s advisory, Data Execution Prevention (DEP) – which is enabled by default in Internet Explorer 8 on Windows XP SP3, Windows Vista SP1, Windows Vista SP2, and Windows 7 – helps to protect against the attacks.

 

All eyes will now be on Microsoft to see how quickly they can issue a fix for this vulnerability – it would certainly be impressive if they managed to roll-out a patch in time for next Tuesday’s “Patch Tuesday”, but that may be a little optimistic.

 

By Graham Cluley @ nakedsecurity.sophos.com

 

Shortcut zero-day attack code goes public

If you’ve been following Chet Wisniewski’s blog over the last few days you will already know about the serious zero-day vulnerability that has been found in versions of Windows.

 

Since confirmed by Microsoft, there exists a vulnerability in versions of Windows which allows a maliciously-crafted Windows shortcut file (.lnk) run a malicious DLL file, simply by being viewed on a USB stick.

 

Furthermore, the attack can be initiated automatically by viewing an affected USB storage device via Windows Explorer, even with AutoRun and AutoPlay are disabled. The Microsoft Security Response Center (MSRC) says that the security hole can also be remotely exploited via WebDAV and network shares.

 

You can watch the following YouTube video where Chet shows the attack in action:

(Enjoy this video? You can check out more on the SophosLabs YouTube channel and subscribe if you like)

In this case, the DLL executed carries a rootkit – helping hide the infection from prying eyes.

 

What is of particular concern, of course, is that other malicious hackers might try to exploit the vulnerability – as it would certainly be a useful tool in any malware’s arsenal. The chances of that occurring has increased over the weekend, as a hacker called Ivanlef0u published proof-of-concept code onto the internet.

 

In the past we’ve seen worms (Conficker is perhaps the most famous example) spread successfully via USB devices, which prompted many firms to disable AutoPlay.

 

There is a real risk that more malware will take advantage of the zero-day exploit now the code is “out there”, taking things to a whole new level.

 

So far, Microsoft has not made a patch available for the problem and has given no timeline as to when a proper fix will be available. However, I’m sure they are feverishly working on a security update for this critical vulnerability.

 

Sophos detects the malware we’ve seen so far using the exploit as W32/Stuxnet-B and Troj/Cplink-A.

 

 

Read More…

 

Apply the Critical Security Updates for Internet Explorer Vulnerabilities (MS10-002 – Critical)

This cumulative security update resolves seven privately reported vulnerabilities and one publicly disclosed vulnerability in Internet Explorer. The more severe vulnerabilities could allow remote code execution if a user views a specially crafted Web page using Internet Explorer. This security update is rated Critical for all supported releases of Internet Explorer.

 

Executive Summary

This security update resolves seven privately reported vulnerabilities and one publicly disclosed vulnerability in Internet Explorer. The more severe vulnerabilities could allow remote code execution if a user views a specially crafted Web page using Internet Explorer. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights.

 

This security update is rated Critical for all supported releases of Internet Explorer: Internet Explorer 5.01, Internet Explorer 6, Internet Explorer 6 Service Pack 1, Internet Explorer 7, and Internet Explorer 8 (except Internet Explorer 6 for supported editions of Windows Server 2003). For Internet Explorer 6 for supported editions of Windows Server 2003 as listed, this update is rated Moderate.

 

The security update addresses these vulnerabilities by modifying the way that Internet Explorer handles objects in memory, validates input parameters, and filters HTML attributes.

 

This security update also addresses the vulnerability first described in Microsoft Security Advisory 979352.

 

Recommendation. The majority of customers have automatic updating enabled and will not need to take any action because this security update will be downloaded and installed automatically. Customers who have not enabled automatic updating need to check for updates and install this update manually. For information about specific configuration options in automatic updating, see Microsoft Knowledge Base Article 294871.

 

For administrators and enterprise installations, or end users who want to install this security update manually, Microsoft recommends that customers apply the update immediately using update management software, or by checking for updates using the Microsoft Update service.

 

[ Download MS10-002 ]