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Message-ID: <FB24803D1DF2A34FA59FC157B77C970503E23FAB@idserv04.idef.com> From: idlabs-advisories at idefense.com (idlabs-advisories@...fense.com) Subject: iDEFENSE Security Advisory 02.09.05: CA BrightStor ARCserve Backup v11 Discovery Service Remote Buffer Overflow Computer Associates BrightStor ARCserve Backup v11 Discovery Service Remote Buffer Overflow Vulnerability iDEFENSE Security Advisory 02.09.05 www.idefense.com/application/poi/display?id=194&type=vulnerabilities February 09, 2005 I. BACKGROUND BrightStor ARCserve Backup for Windows delivers backup and restore protection for all Windows server systems as well as Windows, Linux, Mac OS X and UNIX client environments. http://www3.ca.com/Solutions/ProductFamily.asp?ID=115 II. DESCRIPTION Remote exploitation of a buffer overflow vulnerability in Computer Associates International Inc's BrightStor ARCserve Backup v11 Discovery Service may allow execution of arbitrary code. The BrightStor software will automatically detect other BrightStor (ARCserve) servers on the local network. It does this by sending UDP probe messages to the broadcast address on the network. Each system running the BrightStor software listens for these probes and replies back to IP address embedded in the data of the packet. The Discovery service listens on UDP port 41524 for these probe requests. III. ANALYSIS When a UDP probe is received by the Discovery Service, a stack overflow can occur if the data is larger than the temporary buffer. The recvfrom() call made by the service accepts up to 4096 bytes, however the buffer it is copied to is slightly less than 1000 bytes. The return address can be overwritten by sending a message that is at least 967 bytes long. As the service runs as 'Local System', exploitation of this vulnerability allows running arbitrary code with superuser privileges. IV. DETECTION Computer Associates BrightStor ARCserve Backup v11 (Win32) has been confirmed vulnerable. V. WORKAROUND Employ firewalls, access control lists or other TCP/UDP restriction mechanism to limit access to systems and services. VI. VENDOR RESPONSE http://supportconnectw.ca.com/public/enews/BrightStor/brigcurrent.asp The following vendor patches have been made available: BrightStor ARCserve Backup r11.1 for Windows - All Languages - http://supportconnect.ca.com/sc/redir.jsp?reqPage=search&searchID=QO6276 9 BrightStor ARCserve Backup r11.0 for Windows - All Languages - http://supportconnect.ca.com/sc/redir.jsp?reqPage=search&searchID=QO6276 8 BrightStor Enterprise Backup v10.5 for Windows - http://supportconnect.ca.com/sc/redir.jsp?reqPage=search&searchID=QO6277 0 BrightStor Enterprise Backup v10.0 for Windows - http://supportconnect.ca.com/sc/redir.jsp?reqPage=search&searchID=QO6277 1 BrightStor ARCserve Backup v9.01 for Windows - All Languages - http://supportconnect.ca.com/sc/redir.jsp?reqPage=search&searchID=QO6276 7 BrightStor ARCserve 2000 Backup for Windows (Japanese Only) - http://supportconnect.ca.com/sc/redir.jsp?reqPage=search&searchID=QO6276 6 BrightStor ARCserve Backup r11.1 for NetWare http://supportconnect.ca.com/sc/redir.jsp?reqPage=search&searchID=QO6293 6 BrightStor ARCserve Backup v9 for NetWare http://supportconnect.ca.com/sc/redir.jsp?reqPage=search&searchID=QO6277 2 BrightStor ARCserve Backup r11.1 for Windows - 64 Bit Edition - http://supportconnect.ca.com/sc/redir.jsp?reqPage=search&searchID=QO6299 0 BrightStor ARCserve Backup r11.0 for Windows - 64 Bit Edition - http://supportconnect.ca.com/sc/redir.jsp?reqPage=search&searchID=QO6298 9 BrightStor Enterprise Backup v10.5 for Windows - 64 Bit Edition - http://supportconnect.ca.com/sc/redir.jsp?reqPage=search&searchID=QO6299 1 BrightStor ARCserve Backup v9.01 for Windows - 64 Bit Edition - http://supportconnect.ca.com/sc/redir.jsp?reqPage=search&searchID=QO6298 7 VII. CVE INFORMATION A Mitre Corp. Common Vulnerabilities and Exposures (CVE) number has not been assigned yet. VIII. DISCLOSURE TIMELINE 11/12/2004 Initial vendor notification 11/15/2004 Initial vendor response 02/09/2005 Public disclosure IX. CREDIT This vulnerability was discovered independently by two contributors, one of whom is Patrik Karlsson. The other wishes to remain anonymous. Get paid for vulnerability research http://www.idefense.com/poi/teams/vcp.jsp X. LEGAL NOTICES Copyright (c) 2005 iDEFENSE, Inc. Permission is granted for the redistribution of this alert electronically. It may not be edited in any way without the express written consent of iDEFENSE. If you wish to reprint the whole or any part of this alert in any other medium other than electronically, please email customerservice@...fense.com for permission. Disclaimer: The information in the advisory is believed to be accurate at the time of publishing based on currently available information. Use of the information constitutes acceptance for use in an AS IS condition. There are no warranties with regard to this information. Neither the author nor the publisher accepts any liability for any direct, indirect, or consequential loss or damage arising from use of, or reliance on, this information.
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