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Computer Associates BrightStor ARCserve Backup UniversalAgent Backdoor

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.

DESCRIPTION

Remote exploitation of a design flaw in Computer Associates
International Inc's BrightStor ARCserve Backup UniversalAgent for UNIX
may allow attackers to browse the file system.

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 read access to the
remote file system:

Username: x02rootx03 
 Password: x02<%j8U]`~+Rix03

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.

DETECTION

Computer Associates BrightStor ARCserve Backup r11.1 for Linux and UNIX
have been confirmed vulnerable.

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.

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

CVE INFORMATION

The Common Vulnerabilities and Exposures (CVE) project has assigned the
names CAN-2005-0349 to these issues. This is a candidate for inclusion
in the CVE list (http://cve.mitre.org), which standardizes names for
security problems.

DISCLOSURE TIMELINE

12/02/2004   Initial vendor notification
12/02/2004   Initial vendor response
02/10/2005   Coordinated public disclosure

CREDIT

The discoverer of this vulnerability wishes to remain anonymous.

Get paid for vulnerability research
http://www.idefense.com/poi/teams/vcp.jsp

LEGAL NOTICES

Copyright © 2005 Verisign, 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.