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Security Response
Showing posts tagged with Vulnerabilities & Exploits
Showing posts in English
Shunichi Imano | 27 Jan 2012 13:06:53 GMT

Symantec Security Response is aware of in-the-wild malware exploiting the Microsoft Windows Media Player 'winmm.dll' MIDI File Parsing Remote Buffer Overflow Vulnerability (BID 51292). Microsoft has already issued a patch against this vulnerability in the monthly patch release this January. Applying the patch is strongly recommended.

There are several components involved in this live attack:

  • a.exe
  • baby.mid
  • i.js
  • mp.html

Symantec products detect mp.html and i.js as Trojan.Malscript. The vulnerable baby.mid file is detected as Trojan Horse and the end-result file, a.exe, is...

Robert Keith | 10 Jan 2012 22:11:27 GMT

Hello, welcome to this month’s blog on the Microsoft patch release. This is a smaller month—the vendor is releasing seven bulletins covering a total of eight vulnerabilities.

Only one of this month's issues is rated 'Critical' and it affects Windows Media. The remaining issues affect Windows, the kernel, and Microsoft’s Anti-Cross Site Scripting library.

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 external access at the network perimeter to all key systems unless specific access is required.

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

Robert Keith | 13 Dec 2011 20:31:11 GMT

Hello, welcome to this month’s blog on the Microsoft patch release. This is an average month—the vendor is releasing 13 bulletins covering a total of 19 vulnerabilities.

Three of this month's issues are rated ‘Critical’ and they affect Media Player, Microsoft Time ActiveX control, and the public issue regarding TrueType fonts (currently being exploited by Duqu malware). The remaining issues affect Windows, the kernel, Internet Explorer, Active Directory, Word, Excel, PowerPoint, Active Directory, Publisher, and Office.

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 external access at the network perimeter...
Robert Keith | 08 Nov 2011 22:48:11 GMT

Hello, welcome to this month’s blog on the Microsoft patch release. This is a small month—the vendor is releasing four bulletins covering a total of four vulnerabilities.

Only one of this month's issues is rated ‘Critical’ and it affects the Windows TCP/IP stack. It potentially can be exploited to completely compromise an affected computer. The remaining issues affect Active Directory, Windows Mail, and Windows kernel-mode drivers.

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 external access at the network perimeter to all key systems unless specific access is required.

Microsoft’s...

Symantec Security Response | 06 Nov 2011 14:57:38 GMT

In late September 2011, it was reported that a previously unknown and un-patched vulnerability in Hancom Office (a word processing software predominantly used in Korea) was exploited in the wild. We often hear of new exploits targeting software used worldwide and while these incidents tend to grab all the attention, we also encounter instances of regional software, which often have a limited user base becoming an exploit target. One example of a similar regional software that was also exploited in malware attacks is Ichitaro - a word processing software mostly used in government organizations and their associates in Japan. 

In this case, we managed to track down a couple of malware samples that exploited the reported vulnerability in the Hancom products. The samples are in document files (file extension .hwp) and an exploit attempt is made when the document is opened on a machine installed...
Vikram Thakur | 01 Nov 2011 17:03:57 GMT

The group that initially discovered the original Duqu binaries, CrySyS, has since located an installer for the Duqu threat. Thus far, no-one had been able to recover the installer for the threat and therefore no-one had any idea how Duqu was initially infecting systems. Fortunately, an installer has recently been recovered due to the great work done by the team at CrySyS.

The installer file is a Microsoft Word document (.doc) that exploits a previously unknown kernel vulnerability that allows code execution. We contacted Microsoft regarding the vulnerability and they're working diligently towards issuing a patch and advisory. When the file is opened, malicious code executes and installs the main Duqu binaries. The chart below explains how the exploit in the Word document file eventually leads to the installation of Duqu.

...

Karthikeyan Kasiviswanathan | 26 Oct 2011 18:01:04 GMT

In recent days, we have seen blogs about a specific type of Mass Injection campaign. We take this opportunity to publish our findings in this blog.

This particular campaign has already picked up pace and it is infecting a lot of innocent users out there. It all starts with a script that is injected into certain sites. The script itself points to one particular site: “http://[REMOVED]/urchin.js”. Throughout this blog, we will see the different exploits that this particular campaign uses in order to install malicious files on to a compromised computer.

Upon visiting a site with the injected script, the user is redirected to a malicious site. A subsequent redirection takes the user to a site that contains an obfuscated script. When the script is decoded, it reveals an embedded iFrame tag. Below is an example of the de-obfuscated iFrame tag embedded in the site.

...

Robert Keith | 11 Oct 2011 21:26:32 GMT

Hello and welcome to this month’s blog on the Microsoft patch release. This is an average month — the vendor is releasing 8 bulletins covering a total of 23 vulnerabilities.

Nine of the issues are rated ‘Critical’ and they affect Internet Explorer, .NET, and Silverlight. The remaining issues are rated ‘Important’ and affect Windows, the kernel, Forefront Unified Access Gateway, and Host Integration Server. Of note this month: all Internet Explorer issues being patched are rated ‘Critical’.

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 external access at the network perimeter to all...
Robert Keith | 13 Sep 2011 20:02:22 GMT

Hello and welcome to this month’s blog regarding the Microsoft patch release. This is a smaller month in terms of patches—the vendor has released five bulletins covering a total of 15 vulnerabilities.

This month, all of the issues are rated “Important” and they affect Windows, Office, Excel, and SharePoint. Of note this month are the Office and Excel issues, which can be exploited to execute arbitrary code if a user opens a specially malformed file.

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 external access at the network perimeter to all key systems unless specific access is required.

Microsoft’s summary of...

Robert Keith | 12 Jul 2011 20:34:50 GMT

Hello and welcome to this month’s blog on Microsoft’s patch releases. This is an average month—the vendor is releasing four bulletins covering a total of 22 vulnerabilities.

Only one of the issues is rated ‘Critical’ and it affects the Microsoft Bluetooth Stack. An attacker in physical proximity to a vulnerable computer can exploit this issue for a complete compromise. The remaining issues, all rated “Important,” include a patch for a previously public issue in Microsoft Visio, and multiple local issues in the Client/Server Runtime Subsystem (CSRSS) and Windows kernel-mode drivers.

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....