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.
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X. LEGAL NOTICES
Copyright  2007 iDefense, Inc.
Permission is granted for the redistribution of this alert
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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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