0-Day

The H-Online Security: Microsoft has confirmed a report from Budapest-based Laboratory of Cryptography and System Security (CrySyS), which claimed that the Duqu bot spreads by exploiting a zero day vulnerability in the Windows kernel. How it spreads had previously been unknown. CrySyS discovered the Windows vulnerability whilst analysing the installer. The bot, which anti-virus software firm Symantec believes is related to Stuxnet, infects target systems using a specially crafted Word file which injects the malware into the system using a kernel exploit. Microsoft is already working on a patch. ...

Avira TechBlog: Adobe released a security advisory in which it warns from a zero-day vulnerability within current version of Adobe Flash Player, Reader and Acrobat. Affected are Flash Player 10.2.153.1 and earlier versions for Windows, Mac, Linux and Solaris, the current version integrated in the Chrome web browser, and 10.2.156.12 and earlier versions for Android. The authplay.dll component of current and older version of Adobe Acrobat and Reader are also affected; according to Adobe, the sandbox of Acrobat Reader X prevents from execution of malicious payloads though. ...

Here’s the latest twist in the “membership” site scam: spam emails that tell potential victims to update their Adobe Reader include links to a web site intended to look like something related to Adobe products, but is selling “memberships.” The REAL way to update your Adobe software is on the help menu: help | check for updates (see the end of this blog piece for details). The spam email: ...

Now this is not the first time Windows UAC has hit the news for being flawed, back in February 2009 it was discovered that Windows 7 UAC Vulnerable – User Mode Program Can Disable User Access Control and after that in November 2009 it was demonstrated that Windows 7 UAC (User Access Control) Ineffective Against Malware. A zero-day for Windows 7 back in July of this year also bypassed Windows UAC. ...

Over the last few days, some news organizations have been saying that Stuxnet source code is available on the black market, and that clearly therefor there is an impending Internet Armageddon. This is patently silly, on a number of levels, but silly none-the-less. First thing is that I flat-out don’t believe Stuxnet source is available for sale on the black market or anywhere. Remember how often I say that if something sounds too good to be true, it’s not true? Well, the opposite applies too. If something sounds too bad to be true, it’s not true either. We really don’t know who built Stuxnet, or who the intended target was, be we may rest assured that whoever put that much work into it, isn’t selling it, at any price. It’s actually more probable that some no-honor-among-thieves bad guy is scamming fellow bad guys. “Sure, this is Stuxnet source code. Prove otherwise.” ...

The Redmond company today published its announcement for the upcoming November Patch Tuesday. Microsoft wants to release 3 security bulletins which deal with 11 security vulnerabilities within Office and PowerPoint (up to the brand new Office 2011 for Mac) and Forefront Unified Access Gateway. A patch for the just recently detected 0-day vulnerability in Internet Explorer is not in the list. Adobe meanwhile ships an update for the Flash Player to version 10.1.102.64 today and plans one for the Reader and Acrobat next week. The Flash update is available via the Download Center and fixes the“authplay” vulnerability which got public last week. But the company has to deal with a new security vulnerability as well. It’s not yet exploited and it remains currently unknown whether it is exploitable to infect PCs with malware, but Adobe investigates the flaw. On a public security list a so-called Proof-of-Concept (PoC) has been published which just shows a Denial-of-Service attack. ...

Stuxnet continues to be a hot topic. Here are answers to some of the questions we’ve received. Q: What is Stuxnet? A: It’s a Windows worm, spreading via USB sticks. Once inside an organization, it can also spread by copying itself to network shares if they have weak passwords. Q: Can it spread via other USB devices? A: Sure, it can spread anything that you can mount as a drive. Like a USB hard drive, mobile phone, picture frame and so on. ...

Adobe fixed the vulnerability in Flash Player in a record time again. Just one week after the 0-day became public and started to get exploited, an update is available to close the security hole. Even though Adobe Reader and Acrobat are affected (which are supposed to get an update in 2 weeks), until now we’ve only seen exploits against the Windows Flash Player. Users and administrators should update their Flash Player as soon as possible! The version 10.1.85.3 fixes the issue for Windows, Unix, Solaris and is available through Adobe’s download center. Android users can get the update to 10.1.95.1 on the Android Market Place.

A malicious PDF file has turned up which exploits a new security vulnerability in Adobe Reader and Acrobat – even in the most current version 9.3.4 and 8.2.4, on all supported platforms. There is currently no update available from Adobe which fixes the vulnerability. The company is aware of the problem though. The weakness is a buffer overflow within the CoolType.dll of the Adobe Reader and Acrobat installation. While parsing a PDF document with specially prepared SING (Smart INdependent Glyphlets) fonts it is possible to abuse the vulnerability to execute malware. ...

Sigh… The latest “exploit” that affects hundreds of programs and will be the end of the world as we currently know it is actually a well documented feature of Windows. It has actually been around since the DOS days. In the old days we used to call these Companion viruses. It worked by using a different file extension that will be executed before the real executable. For example if you had a “gwbasic.exe” you would create a “gwbasic.com” anywhere in the path and if the user just typed “gwbasic” he would execute the “gwbasic.com” and not the “gwbasic.exe”. If the author of the “gwbasic.com” was ‘nice’ he could execute the “gwbasic.exe” so as to make the existence of the “gwbasic.com” file harder to detect. ...

On April 9th, Tavis Ormandy published a proof of concept about how to use the latest version of Java to compromise a pc. You can read about it here. He notified Sun, but they weren’t concerned enough to break their patch cycle, so he published the code. The problem is that when Sun released Java 6, update 10 in April 2008, they introduced a new feature (it’s not a bug, it’s a feature folks) called Java Web Start. In order to make it easier for developers to install software, they created a method to execute a program from a website. ...

For the current vulnerability in Internet Explorer 6 and 7 which already gets actively exploited on the net, Microsoft is already testing a patch. The company is still considering whether to release the patch on the regular Patchday or out-of-band. Meanwhile, a “Fix-it”-solution is available. With some registry changes the affected peers factory in iepeers.dll gets disabled by a mouse click. You can download it from Microsoft’s knowledgebase.

Hot on the heels of the Patch Tuesday announcements yesterday, came the announcement of a new zero-day in Internet Explorer (CVE-2010-0806). Whilst checking through some URLs supposedly serving up malicious code to exploit this vulnerability, I noticed a link to some spam runs from earlier in the week. On March 8th SophosLabs saw spam messages attempting to trick the recipient into visiting rogue web pages. Messages used at least two social engineering tricks to lure victims into clicking the malicious link. ...

Exploit code for the the zero-day vulnerability in Internet Explorer has been added to the Metasploit framework. According to an email HD Moore wrote to ZDNet’s Ryan Naraine, the exploit works quite reliable – successful 50% of the times on Windows XP with SP2 and SP3 with IE7 and deactivated Data Execution Prevention (DEP). The security hole got reported yesterday on Microsoft’s March 2010 Patch Tuesday. Drive-by-Download-Exploits are likely to appear now as the Metasploit framework is open source and the exploit can now be abused even by script kiddies. Time to change the default browser – Microsoft just released a new browser choice screen which allows for exactly that!