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ESB-2007.0517 -- [Win] -- Symantec Backup Exec RPC Remote Heap Overflow Vulnerability

Date: 12 July 2007

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             AUSCERT External Security Bulletin Redistribution

                          ESB-2007.0517 -- [Win]
        Symantec Backup Exec RPC Remote Heap Overflow Vulnerability
                               12 July 2007

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:              Symantec Backup Exec
Publisher:            iDefense
Operating System:     Windows
Impact:               Execute Arbitrary Code/Commands
                      Denial of Service
Access:               Remote/Unauthenticated
CVE Names:            CVE-2007-3509

Original Bulletin:
  http://labs.idefense.com/intelligence/vulnerabilities/display.php?553

- --------------------------BEGIN INCLUDED TEXT--------------------

Symantec Backup Exec RPC Remote Heap Overflow Vulnerability

iDefense Security Advisory 07.11.07
http://labs.idefense.com/intelligence/vulnerabilities/
Jul 11, 2007

I. BACKGROUND

Symantec Backup Exec is a data recovery solution. It provides backup
services and includes agents that provide protection and recovery.
Additionally, it facilitates management of local and remote server
backups. More information is available at the URL shown below.

http://www.symantec.com/smb/products/overview.jsp?pcid=bu_rec&pvid=bewin_svr

II. DESCRIPTION

Remote exploitation of a heap overflow vulnerability in Symantec Backup
Exec could allow an unauthenticated attacker to create a denial of
service condition or potentially execute arbitrary code.

The flaw specifically exists within the RPC server that listens on TCP
port 6106. When handling requests using the "ncacn_ip_tcp" protocol,
the service will copy a user supplied amount of data into a fixed-size
heap buffer.

III. ANALYSIS

Exploitation allows attackers to cause the affected service to
terminate. This vulnerability has the potential to lead to the
execution of arbitrary code.

No authentication is required to access the affected RPC service. An
attacker only needs the ability to establish a TCP session.

IV. DETECTION

iDefense confirmed the existence of this vulnerability in Symantec
Backup Exec 10d with all current hot-fixes and service packs applied.
Other versions are suspected to be vulnerable.

V. WORKAROUND

Employing firewalls to limit access to the affected service will
mitigate exposure to this vulnerability.

VI. VENDOR RESPONSE

Symantec has addressed this vulnerability by releasing a HotFix. More
information is available in Symantec's advisory at the following URL.

http://securityresponse.symantec.com/avcenter/security/Content/2007.07.11a.html

VII. CVE INFORMATION

The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CVE-2007-3509 to this issue. This is a candidate for inclusion in
the CVE list (http://cve.mitre.org/), which standardizes names for
security problems.

VIII. DISCLOSURE TIMELINE

05/01/2007  Initial vendor notification
05/01/2007  Initial vendor response
07/11/2007  Coordinated public disclosure

IX. CREDIT

The discoverer of this vulnerability wishes to remain anonymous.

Get paid for vulnerability research
http://labs.idefense.com/methodology/vulnerability/vcp.php

Free tools, research and upcoming events
http://labs.idefense.com/

X. LEGAL NOTICES

Copyright © 2007 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 e-mail 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.

- --------------------------END INCLUDED TEXT--------------------

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        http://www.auscert.org.au/render.html?cid=1980

If you believe that your computer system has been compromised or attacked in 
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Incident Reporting Form at:

        http://www.auscert.org.au/render.html?it=3192

===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
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