Skype vulnerable to heap-based buffer overflow

Overview

A heap-based buffer overflow in Skype may allow a remote attacker to execute arbitrary code or cause a denial-of-service condition.

Description

Skype software provides telephone service over IP networks. Skype contains a buffer overflow in a routine that parses incoming network traffic. The issue exists because Skype relies on user-controlled data to determine the size of buffers used to handle incoming packets. This may allow a remote attacker to manipulate memory allocation routines to create an under-sized buffer. When data is copied to this buffer, a heap-based buffer overflow may occur.

For more information, please refer to Skype Security Bulletin SKYPE-SB/2005-003.

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Impact

A remote attacker may be able to overwrite heap memory causing the Skype process to crash or cause unpredictable behavior. In addition, public reports claim this vulnerability can be used to execute arbitrary code.

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Solution

Upgrade Skype
Please see Skype Security Bulletin SKYPE-SB/2005-003 for a list of fixed Skype versions.

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Vendor Information

905177

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Skype Technologies __ Affected

Updated: October 26, 2005

Status

Affected

Vendor Statement

We have not received a statement from the vendor.

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-2005-03.html&gt;.

If you have feedback, comments, or additional information about this vulnerability, please send us [email](<mailto:[email protected]?Subject=VU%23905177 Feedback>).

CVSS Metrics

Group	Score	Vector
Base
Temporal
Environmental

References

• <http://www.skype.com/security/skype-sb-2005-03.html&gt;
• <http://secunia.com/advisories/17305/&gt;
• <http://www.securityfocus.com/archive/1/414519/30/0/threaded&gt;

Acknowledgements

This vulnerability was reported by SKY-CERT. Skype credits EADS Corporate Research Center security lab with providing information regarding this vulnerability.

This document was written by Jeff Gennari.

Other Information

CVE IDs:	CVE-2005-3267
Severity Metric:	20.88 Date Public: