Video Screencast Help
Symantec Appoints Michael A. Brown CEO. Learn more.
Security Response
Showing posts tagged with Vulnerabilities & Exploits
Showing posts in English
Robert Keith | 15 Jul 2009 00:00:00 GMT

Hello and welcome to this month’s blog on the Microsoft patch releases. This is a fairly light month—the vendor is releasing six bulletins covering a total of nine vulnerabilities.

Six of the issues are rated “Critical” and affect Windows, DirectX, and Windows OpenType Font engine. One of the DirectX issues and one of the ActiveX issues were previously disclosed back in May of this year and earlier this month. Both issues have also seen active exploit attempts in the wild. The remaining issues, rated “Important,” affect Publisher, Virtual PC, Virtual Server, and ISA Server.

As always, customers are advised to follow these security best practices:

- Install vendor patches as soon as they are available.
- Run all software with the least privileges required while still maintaining functionality.
- Avoid handling files from unknown or questionable sources.
- Never visit sites of unknown or questionable integrity.
- Block...

Security Intel Analysis Team | 06 Jul 2009 17:00:19 GMT

As mentioned in a recent blog, Symantec is aware of the exploitation of a previously unknown and unpatched vulnerability affecting the Microsoft Video Streaming ActiveX control. Initially, there were limited in-the-wild attacks; however, new developments indicate that the flaw is now being exploited to great extent in China and other parts of Asia. Reports indicate that thousands of websites have been compromised and are now hosting the exploit for this issue.

Our tests show that Microsoft Windows XP systems are affected, while Windows Vista systems do not seem to be affected by the attack. The flaw lies in the “msvidctl.dll” library and can be exploited by providing a crafted file as input to the “data” parameter of the “BDATuner.MPEG2TuneRequest.1” ActiveX object. The object is associated with...

Joji Hamada | 06 Jul 2009 07:37:37 GMT

It's Independence Day weekend in the United States and many folks are out at picnics, barbeques, and catching firework shows. However, some of us here in the security industry missed out on these events due a new exploit for a zero-day vulnerability in Microsoft's Video Streaming ActiveX control that we discovered in the wild right before the weekend started.

The exploit uses a specially crafted JavaScript file, along with a data file, to take advantage of a vulnerability in the IMPEG2TuneRequest DirectX object interface located in the Msvidctl.dll file. When a user visits a malicious website hosting these files, the vulnerability allows remote code execution and malicious files are downloaded.

Windows XP users with Internet Explorer 6 and 7 are in danger, but those with Internet Explorer 8 installed are not vulnerable. Preliminary testing shows that computers running Windows Vista are not affected by...

Shunichi Imano | 03 Jul 2009 16:21:48 GMT

 As previously promised, Security Researcher Aviv Raff officially launched the Month of Twitter Bugs (MoTB) website on July 1. Aviv will be posting a “Twitter bug a day” on MoTB in order to raise awareness of Twitter APIs and to warn end users of potential problems with the software and systems they use.

MoTB will be following a limited disclosure approach. On the bright side for Twitter, third-party service providers and Twitter themselves are notified of high-risk vulnerabilities at least 24 hours in advance, giving service providers time to create patches before the information goes public on MoTB. When a vulnerability notification is issued, it is hoped that having a deadline will push the affected provider to take action, and the resulting solution will protect end users. On the other hand, if the provider cannot—or will not—come up with a solution in time, the vulnerability information will be posted on MoTB and the bad guys are likely to...

Shunichi Imano | 03 Jul 2009 16:10:42 GMT

I know people are getting sick of malware, attacks, and blogs associated with recent celebrities’ deaths, especially over the past week. But, here we go again. Even a week after Michael Jackson's death was announced, some people refuse to accept that he is gone. Well, after 32 years, even some fanatic followers believe Elvis Presley is still alive.

Security Response has found a suspiciously titled PDF file named “Elvis_Presley_is_alive!!!.pdf.” Maybe Elvis really is still alive, but this particular Elvis has hellhounds with him in the form of exploit code and malware.

When the malicious PDF file is opened, users won’t see any pictures or articles on the aging “King of Rock 'n' Roll,” but instead the file tries to exploit three separate PDF vulnerabilities:

• Adobe Acrobat and Reader Collab 'getIcon()' JavaScript Method Remote Code Execution Vulnerability (...

Liam O Murchu | 19 Jun 2009 13:38:03 GMT | 0 comments

In part one of this blog, I gave an overview of the exploitation flow for the recent DirectShow vulnerability. With no patch for this vulnerability available as of yet, the fact that we are seeing this exploit used more commonly in the wild is worrying. In this article I will discuss the exploit, how it works, and mitigation strategies to protect against it.

To get straight to the mitigation strategies jump to the bottom of the page. This vulnerability does not exist in Vista or Windows Server 2008.

The Vulnerability

To trigger this vulnerability, attackers are currently enticing users to visit a malicious page. Attackers have become quite adept at doing this by embedding iframe tags in legitimate pages, among other techniques.  This is the most likely attack vector. We have seen iframe tags pointing to this exploit inside phishing pages already and we do expect to see...

Liam O Murchu | 17 Jun 2009 21:44:25 GMT | 0 comments

In this article I will outline the stages involved in the full exploitation of the recent DirectShow vulnerability. In particular I will discuss a specific example of how this exploit was used in the wild. The recent DirectShow vulnerability was interesting for a number of reasons and to explore each of those reasons in detail I will first give an overview of the entire exploitation flow, and then explore individual portions in more detail.

Some of the first pages to use this exploit for this vulnerability in the wild were linked from phishing pages. The phishing pages in question not only attempted to steal the visitors’ login credentials, but also silently redirected users to a malicious Web page hosting an exploit for the DirectShow vulnerability (CVE-2009-1537). This malicious Web page loads a corrupt .avi file that exploits the vulnerability and also loads...

Robert Keith | 09 Jun 2009 20:41:41 GMT | 0 comments

Hello and welcome to this month’s blog on the Microsoft patch releases. This is a very heavy month—the vendor is releasing 10 bulletins covering a total of 31 vulnerabilities, which is the largest number of vulnerabilities covered in a single "Patch Tuesday" since Microsoft started the monthly patch program.

A video of Symantec Security Response’s John Harrison discussing the vulnerabilities addressed this month can be viewed here: http://www.youtube.com/watch?v=-X51L07fk48

Seventeen of the issues are rated “Critical” and affect Office, Print Spooler, Excel, Word, Internet Explorer, and Active Directory. The more severe of the two Active Directory issues can be remotely exploited to gain complete access to a vulnerable computer. In most cases, the remaining “Critical” issues require some sort of user interaction to trigger (e.g....

Robert Keith | 12 May 2009 18:58:57 GMT | 0 comments

Hello and welcome to this month’s blog on the Microsoft patch releases. This is a light, yet moderate month—the vendor is releasing one bulletin covering a total of 14 vulnerabilities. This is the first time we've seen a single bulletin cover so many vulnerabilities since Microsoft started the monthly patch program.

All the issues are remote code-execution vulnerabilities in PowerPoint, and Microsoft has rated 11 of them “Critical.” For any of these issues to be triggered, a victim must open a specially crafted file with a vulnerable version of PowerPoint.

As always, customers are advised to follow these security best practices:

- Install vendor patches as soon as they are available.
- Run all software with the least privileges required while still maintaining functionality.
- Avoid handling files from unknown or questionable sources.

Microsoft’s summary of the May releases can be found here:

...

Robert Keith | 14 Apr 2009 19:16:49 GMT | 0 comments

Hello and welcome to this month’s blog on the Microsoft patch releases. This is a fairly heavy month—the vendor is releasing eight bulletins covering a total of 21 vulnerabilities. Two of these issues are covered in more than one bulletin: CVE-2008-2540 in MS09-015 and MS09-014, and CVE-2009-0550 in MS09-013 and MS09-014.

Ten of the issues, rated “Critical,” are remote code-execution vulnerabilities affecting WordPad, Word, DirectX, Windows HTTP services, Internet Explorer, and Excel. The remaining issues, rated “Important” and “Moderate,” affect Windows, Internet Explorer, ISA Server, WordPad, and Windows HTTP services. Nearly all of the bulletins this month address issues that were previously disclosed or are variants of those issues.

As always, customers are advised to follow these security best practices:

- Install vendor patches as soon as they are available.
- Block external access at the...