[VulnWatch] Veritas Backup Exec Remote Agent NDMLSRVR.DLL DoS Vulnerability: Veritas Backup Exec Remote Agent NDMLSRVR.DLL DoS Vulnerability

From: iDEFENSE Labs (labs-no-reply_at_idefense.com)
Date: 06/23/05

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    Date: Thu, 23 Jun 2005 17:44:09 -0400
To: <bugtraq@securityfocus.com>, <vulnwatch@vulnwatch.org>, <full-disclosure@lists.grok.org.uk>

    Veritas Backup Exec Remote Agent NDMLSRVR.DLL DoS Vulnerability

    iDEFENSE Security Advisory 06.23.05
    www.idefense.com/application/poi/display?id=270&type=vulnerabilities
    June 23, 2005

    I. BACKGROUND

    VERITAS Backup Exec is an advanced backup and restore solution for
    Microsoft Windows server environments. More information is available
    from the vendor's website:

        http://veritas.com/Products/www?c=product&refId=57

    II. DESCRIPTION

    Remote exploitation of a denial of service condition in Veritas Software
    Corp.'s Backup Exec allows attackers to crash the vulnerable service.

    The Veritas Backup Exec Agent listens on TCP port 10000 and is
    responsible for accepting connections from the backup server when a
    backup is to occur. Typically the agent would be installed on most
    servers and important workstations in an enterprise environment. Veritas
    Backup Exec uses the standard NMDP protocol to communicate with the
    listening agents.

    The vulnerability specifically exists within NDMLSRVR.DLL due to a null
    pointer dereference upon parsing of a maliciously crafted packet at the
    following instruction:

        0x01053355 MOVZX EAX, WORD PTR [ESI]

    An unhandled exception occurs resulting in a crash of the program and a
    denial of service condition.

    III. ANALYSIS

    Exploitation does not require authentication, thereby allowing any
    remote attacker to cause the denial of service and disruption of backup
    capabilities.

    IV. DETECTION

    iDEFENSE has confirmed the existence of this vulnerability in Backup
    Exec for Windows Servers version 10.0 and 10.0 SP1, the latest versions
    available as of this report. It is suspected that older versions are
    also vulnerable.

    Several vendors ship or use Veritas software including Hitachi and NEC
    Corporation.

    V. WORKAROUND

    Use a firewall to restrict incoming connections to trusted workstations
    running the Backup Exec client software which uses port 10000 TCP.

    VI. VENDOR RESPONSE

    The vendor has addressed this vulnerability in security advisory
    VX05-001:

       http://seer.support.veritas.com/docs/276533.htm

    VII. CVE INFORMATION

    The Common Vulnerabilities and Exposures (CVE) project has assigned the
    name CAN-2005-0772 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

    05/13/2005 Initial vendor notification
    05/13/2005 Initial vendor response
    06/22/2005 Coordinated public disclosure

    IX. CREDIT

    Sebastian Apelt is credited with this discovery.

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    X. LEGAL NOTICES

    Copyright (c) 2005 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
    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.

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