__________________________________________________________ The U.S. Department of Energy Computer Incident Advisory Capability ___ __ __ _ ___ / | /_\ / \___ __|__ / \ \___ __________________________________________________________ INFORMATION BULLETIN Novell NetWare Client for Windows Vulnerabilities [US-CERT Vulnerability Note VU#300636] December 20, 2006 19:00 GMT Number R-092 ______________________________________________________________________________ PROBLEM: Novell NetWare Client for Windows vulnerable to buffer overflow: 1) OpenPrinter() function 2) EnumPrinters() function PLATFORM: Novell Client 4.91 Post-SP3 for Windows 2000/XP/2003 DAMAGE: A remote unauthenticated attacker may be able to execute arbitrary code on a vulnerable system. SOLUTION: Upgrade to the appropriate version. ______________________________________________________________________________ VULNERABILITY The risk is MEDIUM. A remote unauthenticated attacker may be ASSESSMENT: able to execute arbitrary code on a vulnerable system. ______________________________________________________________________________ LINKS: CIAC BULLETIN: http://www.ciac.org/ciac/bulletins/r-092.shtml ORIGINAL BULLETIN: http://www.kb.cert.org/vuls/id/300636 ADDITIONAL LINK: US-CERT Vulnerability Note VU#653076 http://www.kb.cert.org/vuls/id/653076 CVE: http://www.cve.mitre.org/cgi-bin/cvename.cgi?name= CVE-2006-6114 ______________________________________________________________________________ [***** Start US-CERT Vulnerability Note VU#300636 *****] Vulnerability Note VU#300636 Novell NetWare Client for Windows OpenPrinter() function vulnerable to buffer overflow Overview A vulnerability exists in the Novell NetWare client that could allow a remote attacker to execute arbitrary code on an affected system. I. Description NetWare is a network operating system produced and maintained by Novell. Novell provides NetWare clients for Microsoft Windows and Linux operating systems. From the Novell Client for Windows XP/2000 product overview: It enables you to access NetWareŽ services from Windows XP or 2000 workstations or servers and tightly integrates either product into your NetWare network. For example, with Novell Client for Windows XP/2000, you can browse through authorized NetWare directories, transfer files, print documents and use advanced NetWare services directly from a Windows XP or 2000 workstation. The nwspool.dll library is included with the Novell Client for Windows, and provides access to remote printing services. There is a buffer overflow vulnerability in the OpenPrinter() function which is used in the nwspool.dll library. An attacker may be able to trigger the overflow by sending specially-crafted Remote Procedure Call (RPC) requests to the Spooler service on a vulnerable system. II. Impact A remote unauthenticated attacker may be able to execute arbitrary code on a vulnerable system. III. Solution Upgrade Novell has issued a beta upgrade that addresses this issue. See Novell Technical Information Document TID2974765 for more details. Systems Affected Vendor Status Date Updated Novell, Inc. Vulnerable 19-Dec-2006 References http://www.zerodayinitiative.com/advisories/ZDI-06-043.html http://support.novell.com/cgi-bin/search/searchtid.cgi?/2974765.htm http://secunia.com/advisories/23027/ https://secure-support.novell.com/KanisaPlatform/Publishing/583/3125538_f. SAL_Public.html http://support.novell.com/cgi-bin/search/searchtid.cgi?/2974765.htm Credit The Zero Day Initiative disclosed this vulnerability. This document was written by Ryan Giobbi. Other Information Date Public 11/21/2006 Date First Published 12/19/2006 04:29:21 PM Date Last Updated 12/19/2006 CERT Advisory CVE Name CVE-2006-5854 Metric 3.21 Document Revision 9 [***** End US-CERT Vulnerability Note VU#300636 *****] _______________________________________________________________________________ CIAC wishes to acknowledge the contributions of US-CERT for the information contained in this bulletin. _______________________________________________________________________________ CIAC, the Computer Incident Advisory Capability, is the computer security incident response team for the U.S. Department of Energy (DOE) and the emergency backup response team for the National Institutes of Health (NIH). CIAC is located at the Lawrence Livermore National Laboratory in Livermore, California. CIAC is also a founding member of FIRST, the Forum of Incident Response and Security Teams, a global organization established to foster cooperation and coordination among computer security teams worldwide. CIAC services are available to DOE, DOE contractors, and the NIH. CIAC can be contacted at: Voice: +1 925-422-8193 (7x24) FAX: +1 925-423-8002 STU-III: +1 925-423-2604 E-mail: ciac@ciac.org Previous CIAC notices, anti-virus software, and other information are available from the CIAC Computer Security Archive. World Wide Web: http://www.ciac.org/ Anonymous FTP: ftp.ciac.org PLEASE NOTE: Many users outside of the DOE, ESnet, and NIH computing communities receive CIAC bulletins. If you are not part of these communities, please contact your agency's response team to report incidents. Your agency's team will coordinate with CIAC. The Forum of Incident Response and Security Teams (FIRST) is a world-wide organization. A list of FIRST member organizations and their constituencies can be obtained via WWW at http://www.first.org/. This document was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor the University of California nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial products, process, or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation or favoring by the United States Government or the University of California. 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