search menu icon-carat-right cmu-wordmark

CERT Coordination Center

Skype VCARD handling routine contains a buffer overflow

Vulnerability Note VU#668193

Original Release Date: 2005-10-26 | Last Revised: 2005-12-19

Overview

A buffer overflow in the way Skype handles imported VCARDs may allow a remote attacker to execute code on a vulnerable system.

Description

Skype software provides telephone service over IP networks. Skype fails to properly validate imported VCARDs, allowing a buffer overflow to occur. 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.

Impact

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

Solution

Upgrade Skype

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

Do not import VCARDs from untrusted sources


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

Vendor Information

668193
 
Affected   Unknown   Unaffected

Skype Technologies

Updated:  October 26, 2005

Status

  Vulnerable

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.

Addendum

Please see http://www.skype.com/security/skype-sb-2005-02.html.

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

References

Acknowledgements

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: 2005-12-19 14:34 UTC
Document Revision: 11

Sponsored by the Department of Homeland Security Office of Cybersecurity and Communications.