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AUSCERT External Security Bulletin Redistribution
Symantec Backup Exec Man-in-The-Middle
30 May 2011
AusCERT Security Bulletin Summary
Product: Symantec Backup Exec for Windows Servers
Symantec Backup Exec 2010
Operating System: Windows
Impact/Access: Provide Misleading Information -- Existing Account
Unauthorised Access -- Existing Account
CVE Names: CVE-2011-0546
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Security Advisories Relating to Symantec Products - Symantec Backup Exec
May 26, 2011
CVSS v2 : 6.5
Impact : 10
Exploitability : 2.5
CVSS v2 Vector : (AV: A/AC: H/Au: S/C: C/I: C/A: C)
Symantec Backup Exec is vulnerable to man-in-the-middle (MiTM) attack due to
weakness in communication protocol implementation and lack of validation of
identity information exchanged between media server and remote agent.
Product Symantec Backup Exec for Windows Servers
Version 11.0, 12.0, 12.5
Solution(s) Upgrade to Symantec Backup Exec 2010 R3
Product Symantec Backup Exec 2010
Version 13.0, 13.0 R2
Solution(s) Upgrade to Symantec Backup Exec 2010 R3
Symantec was notified of a MiTM issue in the manner in which communication
protocols are implemented between Backup Exec media server and remote agent.
The issue is a result of lack of validation of remote agent identity
information exchanged between media server and remote agent. Successful
exploitation may result in privilege escalation enabling an attacker to
execute post authentication NDMP commands. Successful exploitation requires
the attacker to be an authorized user on the network or have unauthorized
presence on an authorized system on the network.
Symantec product engineers verified that the vulnerability exists in the
versions of Backup Exec indicated above.
Symantec has released Symantec Backup Exec 2010 R3 which establishes trust
between Backup Exec remote agent and Backup Exec media server before
exchanging any sensitive information. Symantec recommends customers upgrade
to this release of Symantec Backup Exec which addresses the concern.
Symantec knows of no exploitation of or adverse customer impact from this
Customers may obtain Symantec Backup Exec 2010 R3 from their normal support/
As a part of normal best practices, Symantec strongly recommends:
* Restrict access to administration or management systems to privileged
* Restrict remote access, if required, to trusted/authorized systems
* Run under the principle of least privilege where possible to limit the
impact of exploit by threats.
* Keep all operating systems and applications updated with the latest
* Follow a multi-layered approach to security. Run both firewall and
anti-malware applications, at a minimum, to provide multiple points of
detection and protection to both inbound and outbound threats.
* Deploy network and host-based intrusion detection systems to monitor
network traffic for signs of anomalous or suspicious activity. This may
aid in detection of attacks or malicious activity related to exploitation
of latent vulnerabilities
Symantec credits Nibin Varghese of iViZ Security, for identifying this issue
and working with us while Symantec fixed the issue.
Security Focus, http://www.securityfocus.com, has assigned Bugtraq ID (BID)
47824 to identify this issue for inclusion in the Security Focus
CVE: This issue is a candidate for inclusion in the CVE list
(http://cve.mitre.org), which standardizes names for security problems.
CVE-2011-0546 has been assigned to this issue.
Symantec takes the security and proper functionality of our products very
seriously. As founding members of the Organization for Internet Safety
(OISafety), Symantec supports and follows responsible disclosure guidelines.
Please contact firstname.lastname@example.org if you feel you have discovered a security
issue in a Symantec product. A member of the Symantec Product Security team
will contact you regarding your submission to coordinate any required
response. Symantec strongly recommends using encrypted email for reporting
vulnerability information to email@example.com. The Symantec Product
Security PGP key can be found at the location below.
Symantec has developed a Product Vulnerability Response document outlining
the process we follow in addressing suspected vulnerabilities in our
products. This document is available below.
Copyright (c) by Symantec Corp.
Permission to redistribute this alert electronically is granted as long as it
is not edited in any way unless authorized by Symantec Product Security.
Reprinting the whole or part of this alert in any medium other than
electronically requires permission from firstname.lastname@example.org
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.
Symantec, Symantec products, Symantec Product Security, and email@example.com
are registered trademarks of Symantec Corp. and/or affiliated companies in the
United States and other countries. All other registered and unregistered
trademarks represented in this document are the sole property of their
* Signature names may have been updated to comply with an updated IPS Signature
naming convention. See http://www.symantec.com/business/support/index?page=content&id=TECH152794&key=54619&actp=LIST for more information.
Last modified on: May 26, 2011
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