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Stack Overflow in Veritas Netbackup Enterprise Server

11.10.05

BACKGROUND

VERITAS NetBackup Enterprise Server delivers mainframe-class data
protection for the largest UNIX, Windows, Linux, and NetWare enterprise
environments, especially for corporate data centers.

http://veritas.com/Products/www?c=product&refId=2

VERITAS NetBackup Server software is cost-effective heterogeneous backup and
recovery solution designed for mid-size organizations, workgroups, and remote
offices.

DESCRIPTION

Exploitation of a buffer overflow vulnerability in Veritas Netbackup
could lead to a remote Denial Of Service or remote code execution. The
Veritas Netbackup Volume Manager keeps track of the location of volumes
(tapes) needed for backup or restore.

By sending a specially crafted packet to the Volume Manager stack overflow occurs.
This is caused by improper bounds checking.

ANALYSIS

Exploitation does not require authentication, thereby allowing any remote
attacker to take over the entire system or to disrupt the backup capabilities.

DETECTION

The following versions are confirmed vulnerable:

- Veritas Netbackup 5.0 with MP1 (vmd.exe 5.0.0.370)
- Veritas Netbackup 5.0 with MP2 (vmd.exe 5.0.0.372)
- Veritas Netbackup 5.0 with MP3 (vmd.exe 5.0.0.377)
- Veritas Netbackup 5.0 with MP4 (vmd.exe 5.0.0.382)
- Veritas Netbackup 5.0 with MP5 (vmd.exe 5.0.0.387)
- Veritas Netbackup 5.1 without MP (vmd.exe 5.1.0.135)
- Veritas Netbackup 5.1 with MP1 (vmd.exe 5.1.0.140)
- Veritas Netbackup 5.1 with MP2 (vmd.exe 5.1.0.146)
- Veritas Netbackup 5.1 with MP3A (vmd.exe 5.1.0.150)

WORKAROUND

Use a firewall to restrict incoming connections to trusted workstations
running the Backup Exec client software, which uses port 13701 TCP.
Latter details released by Symantec state that the vulnerable code may
be able to be exploited through other NetBackup ports/services.

VENDOR RESPONSE

The vendor has released the following advisory to address this vulnerability:

 http://seer.support.veritas.com/docs/279553.htm

Patches for NetBackup 5.0 and 5.1 are available from the following location:

 http://support.veritas.com/menu_ddProduct_NBUESVR_view_DOWNLOAD.htm

CVE INFORMATION

The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CAN-2005-3116 to this issue. This is a candidate for inclusion in
the CVE list (http://cve.mitre.org), which standardizes names for
security problems.

DISCLOSURE TIMELINE

09/14/2005 Initial vendor notification
09/14/2005 Initial vendor response
11/10/2005 Public disclosure

CREDIT

The discoverer of this vulnerability wishes to remain anonymous.

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LEGAL NOTICES

Copyright © 2005 Verisign, 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.