Description: A vulnerability has been discovered in Skype, which can be exploited by malicious people to compromise a user's system.
The vulnerability is caused due to a boundary error in Skype4COM.dll within the "skype4com" URI handler when processing short strings. This can be exploited to cause a limited heap-based buffer overflow as a longer string may be copied into a heap-based buffer previously allocated based on the length of the supplied URI.
Successful exploitation allows execution of arbitrary code when a user e.g. visits a malicious website.
The vulnerability is confirmed in Skype 3.5.0.239. Other versions prior to 3.6.0.216 may also be affected.
Do you have this product installed on your home computer? Scan using the free Personal Software Inspector. Check if a vulnerable version is installed on computers in your corporate network, using the Network Software Inspector.
Solution: Update to version 3.6.0.216 or later.
Provided and/or discovered by: Reported by an anonymous person via ZDI.
Changelog: 2007-12-07: Added additional information based on research by Secunia Research.
2008-02-01: Added link to vendor's advisory.
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