[VulnWatch] RE: iDEFENSE Security Advisory 10.04.05: Symantec AntiVirus Scan Engine Web Service Buffer Overflow Vulnerability

From: iDEFENSE Labs (labs-no-reply_at_idefense.com)
Date: 10/05/05

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    Date: Tue, 4 Oct 2005 18:09:43 -0400
    To: <bugtraq@securityfocus.com>, <vulnwatch@vulnwatch.org>, <full-disclosure@lists.grok.org.uk>

    A correction should be made to the credit section of this advisory. The
    vulnerability was not discovered by infamous41md[at]hotpop.com. Instead
    it was discovered by an anonymous contributor.
    infamous41md[at]hotpop.com is responsible for the discovery of the other
    vulnerability released today in UW-IMAP.

    Michael Sutton
    Director, iDEFENSE Labs

    -----Original Message-----
    From: iDEFENSE Labs
    Sent: Tuesday, October 04, 2005 6:04 PM
    To: bugtraq@securityfocus.com; vulnwatch@vulnwatch.org;
    Subject: iDEFENSE Security Advisory 10.04.05: Symantec AntiVirus Scan
    Engine Web Service Buffer Overflow Vulnerability

    Symantec AntiVirus Scan Engine Web Service Buffer Overflow Vulnerability

    iDEFENSE Security Advisory 10.04.05
    October 4, 2005


    Symantec Scan Engine is a TCP/IP server and programming interface that
    enables third parties to incorporate support for Symantec content
    scanning technologies into their proprietary applications. More
    information is available from the vendor website:



    Remote exploitation of a buffer overflow vulnerability in Symantec
    AntiVirus Scan Engine can allow remote attackers to execute arbitrary

    The vulnerability specifically exists due to insufficient input
    validation of HTTP Headers. A remote attacker can send a specially
    crafted HTTP request to the administrative Scan Engine Web Wervice on
    port 8004 to crash the service or execute arbitrary code. Due to
    improper use of signed integer value types, a negative value can be
    supplied by a connecting client, which will interpret the value as a
    very large number and later use the value as an argument to a memory
    copy operation. An overly long copy will occur resulting in a heap
    overflow. Remote attackers can supply carefully crafted HTTP requests to
    trigger the heap overflow and execute arbitrary code.


    Successful exploitation of the vulnerability can result in remote code
    execution with SYSTEM privileges. Exploitation of the vulnerability does
    not require credentials or any other element in the attack other than
    being able to send a HTTP request to TCP port 8001 on the vulnerable
    server. It is recommended to apply the vendor-supplied workaround or
    upgrade to the latest available version of the software.


    iDEFENSE Labs has confirmed the existence of this vulnerability in
    Symantec AntiVirus Scan Engine 4.0. The vendor has confirmed that the
    vulnerability also effects products utilizing Symantec AntiVirus Scan
    Engine 4.3, however Scan Engine 4.1 is not affected.


    The vendor has supplied the following workaround solution:

    "Default installation instructions state that, for security reasons,
    customers should access the administrative interface using a switch or
    via a secure segment of the network. The Symantec AntiVirus Scan Engine
    Administration default port, 8004/tcp, should be locked down for trusted
    internal access only. This port can be changed, as it might conflict
    with existing applications in the environment. But whatever port is used
    for the user-interface, it should never be visible external to the
    network which greatly reduces opportunities for unauthorized access. A
    customer may choose to completely disable the Symantec AntiVirus Scan
    Engine's user-interface once it has been satisfactorily configured.

    * To disable the user interface, set the port to "0" in the user-
      interface and restart the Symantec AntiVirus Scan Engine.

    * To re-enable the user-interface, edit the Symantec AntiVirus Scan
      Engine configuration file, set the port back to 8004/tcp, or the
      applicable user-configured port, and restart the Symantec AntiVirus
      Scan Engine."


    "Symantec Engineers have verified this issue and made security updates
    available for the Symantec AntiVirus Scan Engine. Symantec strongly
    recommends all customers immediately apply the latest updates for their
    supported product versions to protect against these types of threats.
    Symantec is unaware of any adverse customer impact from this issue."

    A vendor advisory for this issue is available at:



    The Common Vulnerabilities and Exposures (CVE) project has assigned the
    name CAN-2005-2758 to this issue. This is a candidate for inclusion in
    the CVE list (http://cve.mitre.org), which standardizes names for
    security problems.


    08/31/2005 Initial vendor notification
    08/31/2005 Initial vendor response
    10/04/2005 Coordinated public disclosure


    The discoverer of this vulnerability wishes to remain anonymous.

    infamous41md[at]hotpop.com is credited with this discovery.

    Get paid for vulnerability research

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


    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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