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Skype URI handling routine contains a buffer overflow

Vulnerability Note VU#930345

Original Release Date: 2005-10-26 | Last Revised: 2005-10-26


A buffer overflow in Skype may allow a remote attacker to execute code on a vulnerable system.


Skype software provides telephone service over IP networks. There is a buffer overflow in the routines that handle Skype-specific URIs (callto:// or skype://). The buffer overflow may stem from an input validation error in the Delphi routine SysUtils.WideFmtStr(...).

For more information, please see Skype Security Bulletin SKYPE-SB/2005-002 and Delphi Bug Report 4744.


A remote attacker may be able to execute arbitrary code if they can persuade a user to access a Skype-specific URI with a vulnerable Skype installation.


Upgrade Skype
Please see Skype Security Bulletin SKYPE-SB/2005-002 for a list of fixed Skype versions.

Do not access Skype URIs from untrusted sources

Exploitation occurs by accessing a specially crafted Skype URIs. By only accessing a Skype URIs from trusted or known sources, the chances of exploitation are reduced.

Vendor Information

Affected   Unknown   Unaffected

Skype Technologies

Updated:  October 26, 2005



Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.


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If you have feedback, comments, or additional information about this vulnerability, please send us email.

CVSS Metrics

Group Score Vector
Base N/A N/A
Temporal N/A N/A
Environmental N/A



This vulnerability was reported by SKY-CERT. SKY-CERT credits Mark Rowe of Pentest Limited with providing information regarding this issue.

This document was written by Jeff Gennari.

Other Information

CVE IDs: CVE-2005-3265
Severity Metric: 10.13
Date Public: 2005-10-25
Date First Published: 2005-10-26
Date Last Updated: 2005-10-26 16:49 UTC
Document Revision: 14

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