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AUSCERT External Security Bulletin Redistribution
ESB-2005.0142 -- iDEFENSE Security Advisory 02.10.05
Computer Associates BrightStor ARCserve Backup
UniversalAgent Backdoor Vulnerability
11 February 2005
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AusCERT Security Bulletin Summary
---------------------------------
Product: BrightStor ARCserve Backup r11.1
Publisher: iDEFENSE
Operating System: Linux variants
UNIX variants
Impact: Execute Arbitrary Code/Commands
Access: Remote/Unauthenticated
Original Bulletin: http://www.idefense.com/application/poi/display?id=198
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Computer Associates BrightStor ARCserve Backup UniversalAgent Backdoor
Vulnerability
iDEFENSE Security Advisory 02.10.05
www.idefense.com/application/poi/display?id=198&type=vulnerabilities
February 10, 2005
I. BACKGROUND
BrightStor ARCserve Backup r11.1 delivers leading backup and restore
protection for all classes of Windows, NetWare, Linux and UNIX servers,
as well as Windows, Mac OS X, Linux, UNIX, AS/400 and VMS client
environments.
II. DESCRIPTION
Remote exploitation of a design flaw in Computer Associates
International Inc's BrightStor ARCserve Backup UniversalAgent for UNIX
may allow execution of arbitrary code.
The vulnerability specifically exists due to hard coded credentials
being left in the production release of the UniversalAgent for UNIX. An
attacker may use the following credentials to gain full access to the
remote file system and potentially execute arbitrary commands with
permissions of the root user.
Username: \x02root\x03
Password: \x02<%j8U]`~+Ri\x03
III. ANALYSIS
The BrightStor software uses a network agent to perform backups on
nodes across the network. Typically, the agent service requires either
administrative credentials or a node-specific password and is capable
of backing up files and remotely executing commands. The agent will
listen on TCP and UDP ports 6051 by default and is installed on every
node that the BrightStor server is configured to backup.
IV. DETECTION
Computer Associates BrightStor ARCserve Backup r11.1 for Linux and UNIX
have been confirmed vulnerable.
V. WORKAROUND
Employ firewalls, access control lists or other TCP/UDP restriction
mechanism to limit access to the backup port on affected systems and
services. The login credentials are sent in cleartext and may also be
used to detect connections from attackers.
VI. VENDOR RESPONSE
The following vendor advisories are available for this issue:
BAB 7.0 Linux
http://supportconnect.ca.com/sc/solcenter/solresults.jsp?aparno=QO63672
BAB 9.0 Linux Japanese
http://supportconnect.ca.com/sc/solcenter/solresults.jsp?aparno=QO63673
BAB 9.0 Linux English
http://supportconnect.ca.com/sc/solcenter/solresults.jsp?aparno=QO63674
BEB 10.0 AIX
http://supportconnect.ca.com/sc/solcenter/solresults.jsp?aparno=QO63675
BEB 10.0 HPUX
http://supportconnect.ca.com/sc/solcenter/solresults.jsp?aparno=QO63676
BEB 10.0 Solaris
http://supportconnect.ca.com/sc/solcenter/solresults.jsp?aparno=QO63677
BEB 10.5 Tru64
http://supportconnect.ca.com/sc/solcenter/solresults.jsp?aparno=QO63678
BEB 10.5 HP
http://supportconnect.ca.com/sc/solcenter/solresults.jsp?aparno=QO63679
BEB 10.5 AIX
http://supportconnect.ca.com/sc/solcenter/solresults.jsp?aparno=QO63680
BEB 10.5 Solaris
http://supportconnect.ca.com/sc/solcenter/solresults.jsp?aparno=QO63681
BAB 11.1 Macintosh
http://supportconnect.ca.com/sc/solcenter/solresults.jsp?aparno=QO63682
BAB 11.1 Mainframe Linux
http://supportconnect.ca.com/sc/solcenter/solresults.jsp?aparno=QO63683
BAB 11.1 Tru64
http://supportconnect.ca.com/sc/solcenter/solresults.jsp?aparno=QO63684
BAB 11.1 Linux
http://supportconnect.ca.com/sc/solcenter/solresults.jsp?aparno=QO63685
BAB 11.1 HP
http://supportconnect.ca.com/sc/solcenter/solresults.jsp?aparno=QO63691
BAB 11.1 AIX
http://supportconnect.ca.com/sc/solcenter/solresults.jsp?aparno=QO63687
BAB 11.1 - Solaris
http://supportconnect.ca.com/sc/solcenter/solresults.jsp?aparno=QO63688
BEB 10.0 Mainframe Linux
http://supportconnect.ca.com/sc/solcenter/solresults.jsp?aparno=QO63689
VII. CVE INFORMATION
A Mitre Corp. Common Vulnerabilities and Exposures (CVE) number has not
been assigned yet.
VIII. DISCLOSURE TIMELINE
12/02/2004 Initial vendor notification
12/02/2004 Initial vendor response
02/10/2005 Coordinated public disclosure
IX. CREDIT
The discoverer of this vulnerability 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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