Vulnerability Note VU#582498

InnerMedia DynaZip library vulnerable to buffer overflow via long file names

Overview

Releases prior to version 5.00.04 of the InnerMedia DynaZip compression library contain a buffer overflow that may allow a remote attacker to execute arbitrary code.

I. Description

DynaZip is a popular compression library for the Microsoft Windows platform. A bounds checking deficiency in DynaZip may allow a buffer overflow. An attacker can exploit this vulnerability by creating a zip archive containing files with long names. Depending on the version of DynaZip and the length of the file names, a buffer overflow can occur when a user accesses a specially crafted archive.

According to InnerMedia, DynaZip versions prior to and including 5.00.03 are vulnerable. DynaZip version 5.00.04 and later, as well as DynaZip Max Secure version 6.00.01 and later are not affected by this vulnerability.

The DynaZip library is used in a wide variety of applications. Software developers should check their applications to ensure they are using a non-vulnerable version of library. In addition, users are encouraged to contact their software vendors if they suspect they are vulnerable.

II. Impact

If a remote attacker can persuade a user to access a specially crafted zip file, the attacker may be able to execute arbitrary code on that user's system, possibly with elevated privileges.

III. Solution

Upgrade DynaZip

Inner Media customers are encouraged to upgrade to an unaffected version of DynaZip.

Inner Media's update and upgrade policy states:

Any registered licensed user of DynaZip may update any major revision level of DynaZip to any minor revision level update within then same major revision for FREE. For example; DynaZip version 5.00.03 can be updated to version 5.00.04 for FREE. Any upgrade from one major revision level of DynaZip to another major revision level is offered at a reduced cost to any licensee. For example an upgrade from DynaZip version 4.00.04 to version 5.00.04 would incur a charge

Systems Affected

Vendor	Status	Date Notified
GetRight	Unknown	13-Dec-2004
InnerMedia	Vulnerable	22-Nov-2004
Lotus Software	Vulnerable	7-Sep-2006
RealNetworks	Vulnerable	2-Dec-2004

References

http://www.eeye.com/html/research/advisories/AD20041027.html
http://secunia.com/advisories/12869/
http://www.networksecurity.fi/advisories/lotus-notes.html
http://www.securityfocus.com/bid/19143

Credit

Information regarding this vulnerability was provided by Dan Plakosh, eEye Digital Security, and Inner Media Inc.

This document was written by Jeff Gennari.

Other Information

Date Public:	2004-10-12
Date First Published:	2004-11-22
Date Last Updated:	2007-02-27
CERT Advisory:
CVE-ID(s):	CVE-2004-1094
NVD-ID(s):	CVE-2004-1094
US-CERT Technical Alerts:
Metric:	16.05
Document Revision:	197

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