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Insecure Library Loading
Highly critical

Skype skype4com URI Handler Buffer Overflow

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Release Date:  2007-12-07    Last Update:  2008-02-01    Views:  20,945

Secunia Advisory SA27934

Where:

From remote

Impact:

System access

Solution Status:

Vendor Patch

CVE Reference(s):

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.


Solution:
Update to version 3.6.0.216 or later.

Provided and/or discovered by:
Reported by an anonymous person via ZDI.

Original Advisory:
Skype (SKYPE-SB/2007-003):
http://www.skype.com/security/skype-sb-2007-002.html

ZDI:
http://www.zerodayinitiative.com/advisories/ZDI-07-070.html

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 skype4com URI Handler Buffer Overflow

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