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Highly critical

Skype Cross-Zone Scripting Security Enhancement

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Release Date:  2008-02-06    Last Update:  2008-02-14    Views:  15,042

Secunia Advisory SA28791

Where:

From remote

Impact:

System access

Solution Status:

Vendor Patch

CVE Reference(s):

Description


An update has been released for Skype, which implements security enhancements to prevent compromise of users' systems.

Skype uses the Internet Explorer web control to render HTML from certain websites (e.g. DailyMotion, Metacafe, and SkypeFind). As the content is rendered in the "Local Machine" security zone, this allows execution of arbitrary script code on a user's system via script insertion vulnerabilities present in these websites.

Various vulnerabilities have been discovered in these sites, which provide vectors when a user e.g. uses the Skype video gallery browser section or finds a video uploaded to the DailyMotion gallery with a specially crafted video title.

Successful exploitation requires that a displayed website is vulnerable to script insertion.

The vulnerability is reported in the following Skype for Windows versions:
- All versions including 3.5.*
- Version 3.6.*.244 and prior


Solution:
Update or upgrade to version 3.6.*.248 or later, which now runs the Internet Explorer web control in the "Internet" security zone.

Further details available to Secunia VIM customers

Provided and/or discovered by:
Aviv Raff

Original Advisory:
Skype:
http://www.skype.com/security/skype-sb-2008-001-update2.html
http://www.skype.com/intl/en/security/skype-sb-2008-002.html
http://www.skype.com/intl/en/security/skype-sb-2008-001-update1.html
http://www.skype.com/intl/en/security/skype-sb-2008-001.html

Aviv Raff:
http://aviv.raffon.net/2008/01/17/SkypeCrosszoneScriptingVulnerability.aspx
http://aviv.raffon.net/2008/01/31/AttackersCanSkypeFindYou.aspx

Deep Links:
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: Skype Cross-Zone Scripting Security Enhancement

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