Microsoft has released seven patches for this month's Patch Tuesday offering, including fixes for vulnerabilities in Internet Explorer 10 and Silverlight.
Redmond's latest patches offer fixes for 20 vulnerabilities in total.
Analysts say that the highest priority patch for this month should be MS13-021. The patch covers nine vulnerabilities found in Internet Explorer version 6 through 10. Vulnerabilities addressed will also affect Internet Explorer on RT platforms.
"Of the nine Common Vulnerabilities and Exposures (CVEs) addressed, seven of them affect every supported version of Internet Explorer, so attackers have many choices when selecting a vulnerability to exploit in the near future," said BeyondTrust chief technology officer Marc Maiffret.
Maiffret also warns that patches for Silverlight 5 and Vizio Viewer should be prioritised. He says the Silverlight bug could be accessed by a drive-by attack on a web-page hosting Silverlight content. While the Visio Viewer issue can be broken through the use of an email phishing attack.
Fellow security commentator, Lumension security and forensic analyst Paul Henry, says the Silverlight patch should be the second highest priority patch for IT admins.
"This browse-an-own attack is a pretty standard one, where users might browse to a website that has malicious content. One important thing to note here is Silverlight 4 is no longer supported by Microsoft," said Henry.
"Most users will be on Silverlight 5 already, since many common websites automatically upgrade you. However, if you are still on the old version, you need to upgrade in addition to installing this patch."
The Visio Viewer patch is also of note as the patch is may be needed for users who do not use the Visio program.
According to director of security research at Trustwave, Ziv Mador, the patch affects a shared component in Microsoft Office.
"You may be offered this update even if you don't have Visio Viewer installed," said Mador.
"The flaw here exists in a shared component with MS Office, the component is present in Office so the update will be offered to all Office users even if they don't have Visio Viewer installed."
For a full list of patches users can go to Microsoft's Security Bulletin's webpage. Patches come from the firm's monthly Patch Tuesday programme.
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