Video Screencast Help
Security Response
Showing posts tagged with Vulnerabilities & Exploits
Showing posts in English
Sean Hittel | 09 Apr 2009 20:57:45 GMT | 0 comments

First the CollectEmailInfo vulnerability was exploited in the wild, then the util.printf vulnerability, followed by JBIG2, and Foxit. With the level of obfuscation of the exploits often used, distinguishing each vulnerability in the wild has become a problem. An in-the-wild exploit against the Adobe Reader Collab.getIcon vulnerability (described in BID 34169) was discovered on April 5. Adobe has already...

Sean Hittel | 23 Mar 2009 22:48:01 GMT | 0 comments

Last year when Adobe Acrobat was being exploited in the wild, some were calling for people to switch their PDF reader software as a defense against the exploits targeting Acrobat Reader. While application diversity can enhance an individual's ability to withstand broadcast attacks, it is important to consider that any alternative software still needs to be maintained, and consideration needs to be given as to how security systems handle this software. If a replacement application is not handled well by perimeter systems, has security been improved by the replacement?

Today's Web attack toolkit operators are often content with only a small percentage of success with their attacks. This often means that they are deploying any and every functional exploit they can get their hands on without regard for how successful it may be. Thinking that one can simply move to software that is not currently being exploited is not a good long term solution. In the long term, moving...

John McDonald | 17 Mar 2009 10:14:48 GMT | 0 comments

Well, it's that time of year again. April is the first month of the fiscal year in Japan, and a time when people look forward to the breath-taking beauty of cherry blossoms—known as sakura in Japan—slowly covering the country from end to end for an all-too-brief few weeks. Unfortunately it also seems to be a time malicious code authors in the Land of the Rising Sun see as opportune to do some of their dirty work. In this case, that misuse of perfectly good time resulted in the release of an exploit for a new Ichitaro vulnerability.

JustSystems’ Ichitaro is one of the most widely used word processing programs in Japan. On this occasion, a specially crafted Ichitaro word document creates a randomly named .tmp file in the Windows system directory. This .tmp file then drops and opens a legitimate Ichitaro word document, but it also creates a file named “beer80.exe” in the system directory. The .exe file will be unseen by the user and will,...

Robert Keith | 10 Mar 2009 18:23:09 GMT | 0 comments

Hello and welcome to this month’s blog on the Microsoft patch releases. This is a fairly light month. The vendor is releasing three bulletins covering a total of eight vulnerabilities. Ben Greenbaum (Sr. Research Manager, Symantec Security Response) discusses these vulnerabilities in a video that can be viewed here.

Of the eight vulnerabilities, only one is rated “Critical”—a remote code-execution vulnerability affecting the Windows kernel. This is a fairly serious issue, because a successful exploit will result in a complete compromise of the affected computer. The remaining issues, all rated “Important”, affect the Windows kernel, SChannel, and Windows WINS and DNS servers.

 

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

- Install vendor patches as soon as they are available.
- Block...

Patrick Fitzgerald | 24 Feb 2009 17:58:10 GMT | 0 comments

Yesterday, our engineers in Japan noticed the arrival of some unusual submissions from a small number of our customers. All of these submissions contained suspicious Microsoft Office Excel 2007 spreadsheets. Further analysis showed that these files were exploiting a vulnerability in Excel that allowed them to drop and execute a binary onto the file system.

We see this kind of behavior all the time, but as the analysis of the vulnerability progressed it became clear that this vulnerability is one that we had not seen before. It turns out that this vulnerability exists in the old Excel binary .xls format and not the new .xlsx format. Opening the malicious spreadsheet triggers the vulnerability. This causes the shellcode to execute and then drops two files on the system—the malicious binary mentioned earlier and another valid Excel document. The shellcode then executes the dropped file and opens the valid Excel document to mask the fact that Excel has just crashed. This...

Patrick Fitzgerald | 20 Feb 2009 14:37:02 GMT | 0 comments

Symantec Security Response has received several PDF files that actively exploit a vulnerability in Adobe Reader. We are continuing to remain in contact with Adobe on this vulnerability in order to ensure the security of our mutual customers.

 

This exploit is currently detected heuristically as Bloodhound.PDF.6 by our products. We have noticed an increase in submissions of similar PDFs using this exploit. So far, these attacks appear to be targeted and not widespread. Symantec is continuing to monitor the vulnerability’s use in the wild.

 

While examining the JavaScript code used for “heap-spraying” in these PDFs, we can see the same comments that show that these separate exploit attempts come from the same source! It seems likely that the people behind this threat are using targeted attacks against...

Robert Keith | 10 Feb 2009 21:05:22 GMT | 0 comments

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

Of those, three are “Critical” issues affecting Exchange Server and Internet Explorer. We haven’t seen email-based attacks in a while, but the first Exchange Server issue is exactly that. To exploit the issue, an attacker only needs to send an email with a specially crafted attachment and entice an unsuspecting victim into opening the email. The other Exchange issue, rated “Important,” can be remotely exploited to cause an affected server to crash. This could have a significant impact on enterprise users.

We've noticed what appears to be a trend regarding Internet Explorer. The vendor has released a cumulative security bulletin for that product every other month for the past 18 months.

The remaining issues, all rated “Important,...

Eric Chien | 02 Feb 2009 21:52:21 GMT | 0 comments

If you were searching the Internet for videos of the American Idol TV show, you might have received a bigger dose of reality than you were expecting. Unfortunately, one of the more popular video link aggregators was hosting infected advertisements on their site. 

Advertising networks are a popular platform with malicious code authors when trying to gain a widespread distribution of their malware. They provide advertising networks with a URL that is supposed to point to their advertisement, but instead of only displaying an ad, they redirect the users to a rogue website. In this case, the advertisement was redirecting Web browsers to a PDF file that was using the Adobe Reader 'util.printf()' JavaScript Function Stack Buffer Overflow Vulnerability to install a malicious executable on the browser’s host system. (Please note that this vulnerability is resolved in Adobe...

Robert Keith | 13 Jan 2009 19:31:45 GMT | 0 comments

Hello and welcome to this month’s blog on the Microsoft patch releases. This is a light month—the vendor is releasing only one bulletin covering a total of three vulnerabilities affecting Server Message Block (SMB).

Of those issues, two are “Critical” server-side, remotely exploitable code-execution vulnerabilities. These are rather serious issues that may allow remote attackers to completely compromise a vulnerable computer. Given the nature of these issues, developing viable exploits to execute code may prove difficult, but denial-of-service attacks will likely be trivial. The remaining issue, rated “Moderate”, is a remote denial-of-service vulnerability.

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 network perimeter to specific sites and computers only.
-Run all software with the least privileges...

Security Intel Analysis Team | 31 Dec 2008 00:07:48 GMT | 0 comments

This has been an interesting year for high-profile vulnerabilities and security research. In 2008, awareness has been raised about a number of high impact, remote code-execution vulnerabilities affecting both server- and client-side applications. Published attacks targeted important protocols used by critical Internet infrastructure. A number of flaws in the implementation of a number of cryptographic implementations have also been made public. In addition to the aforementioned issues, new exploitation techniques were demonstrated that emphasized the growing trend toward application-specific attacks targeting Web technologies. 

Let's begin with a few high-profile memory corruption flaws on the Microsoft Windows front. The year started with a bang, MS08-001, which is a remotely exploitable memory-corruption vulnerability affecting the Microsoft Windows kernel. Then, in October we saw in-the-wild exploitation of a previously undisclosed RPC vulnerability affecting...