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iDEFENSE Security Advisory 02.09.05: CA BrightStor ARCserve Backup v11 Discovery Service Remote Buffer Overflow
From: idlabs-advisories () idefense com
Date: Wed, 9 Feb 2005 18:15:56 -0500

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 () idefense 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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