====================================================================== Secunia Research 20/06/2008 - XnView, NConvert, and GFL SDK Sun TAAC Buffer Overflow - ====================================================================== Table of Contents Affected Software....................................................1 Severity.............................................................2 Vendor's Description of Software.....................................3 Description of Vulnerability.........................................4 Solution.............................................................5 Time Table...........................................................6 Credits..............................................................7 References...........................................................8 About Secunia........................................................9 Verification........................................................10 ====================================================================== 1) Affected Software * XnView 1.93.6 for Windows * XnView 1.70 for Linux and FreeBSD * NConvert 4.92 * GFL SDK 2.82 NOTE: Other versions may also be affected. ====================================================================== 2) Severity Rating: Highly critical Impact: System access Where: From remote ====================================================================== 3) Vendor's Description of Software XnView: "A software to view and convert graphic files, really simple to use!" Product Link: http://pagesperso-orange.fr/pierre.g/xnview/enhome.html NConvert: "Come to discover NConvert, a batch utility to convert graphic files!" Product Link: http://pagesperso-orange.fr/pierre.g/xnview/en_nconvert.html GFL SDK: "GFL SDK is a free library (used by XnView) for developers who would like to support graphics image formats easily." Product Link: http://pagesperso-orange.fr/pierre.g/xnview/engfl.html ====================================================================== 4) Description of Vulnerability Secunia Research has discovered a vulnerability in XnView, NConvert, and GFL SDK, which can be exploited by malicious people to compromise a user's system. The vulnerability is caused due to a boundary error when processing the "format" keyword of Sun TAAC files. This can be exploited to cause a stack-based buffer overflow by e.g. tricking a user into viewing a specially crafted Sun TAAC file. Successful exploitation allows execution of arbitrary code. The vulnerability is confirmed in version 1.70 of XnView for Linux and FreeBSD, XnView 1.93.6 for Windows, GFL SDK 2.82, and NConvert 4.92. Other versions may also be affected. ====================================================================== 5) Solution XnView: The vulnerability is fixed in version 1.94 beta1. NConvert and GFL SDK: A fixed version is not currently available. Do not open untrusted Sun TAAC files. ====================================================================== 6) Time Table 28/05/2008 - Vendor notified. 29/05/2008 - Vendor response. 18/06/2008 - Vendor issues XnView 1.94 beta1. 20/06/2008 - Public disclosure. ====================================================================== 7) Credits Discovered by Stefan Cornelius, Secunia Research. ====================================================================== 8) References The Common Vulnerabilities and Exposures (CVE) project has assigned CVE-2008-2427 for the vulnerability. ====================================================================== 9) About Secunia Secunia offers vulnerability management solutions to corporate customers with verified and reliable vulnerability intelligence relevant to their specific system configuration: http://corporate.secunia.com/ Secunia also provides a publicly accessible and comprehensive advisory database as a service to the security community and private individuals, who are interested in or concerned about IT-security. http://secunia.com/ Secunia believes that it is important to support the community and to do active vulnerability research in order to aid improving the security and reliability of software in general: http://corporate.secunia.com/secunia_research/33/ Secunia regularly hires new skilled team members. Check the URL below to see currently vacant positions: http://secunia.com/secunia_vacancies/ Secunia offers a FREE mailing list called Secunia Security Advisories: http://secunia.com/secunia_security_advisories/ ====================================================================== 10) Verification Please verify this advisory by visiting the Secunia website: http://secunia.com/secunia_research/2008-24/ Complete list of vulnerability reports published by Secunia Research: http://secunia.com/secunia_research/ ======================================================================