[NEWS] RealNetworks Helix Universal Server DoS (GET_PARAMETER, DESCRIBE)

From: SecuriTeam (support_at_securiteam.com)
Date: 04/18/04

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Date: 18 Apr 2004 14:20:15 +0200

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      RealNetworks Helix Universal Server DoS (GET_PARAMETER, DESCRIBE)
    ------------------------------------------------------------------------

    SUMMARY

     <http://www.realnetworks.com> RealNetworks Helix Universal Server is a
    universal digital media delivery platform with industry leading
    performance, integrated content distribution and Web services support.
    Remote exploitation of a denial of service (DoS) vulnerability in
    RealNetworks, Inc.'s Helix Universal Server could allow an attacker to
    restart and potentially disable the server.

    DETAILS

    Vulnerable Systems:
     * RealNetworks Helix Universal Server versions 9.0.2 for Linux and
    version 9.0.1 for Windows

    Immune Systems:
     * RealNetworks Helix Universal Server versions 9.0.3

    The problem specifically exists in the handling of specially crafted GET
    requests. The following sample requests will cause a null pointer
    reference, thereby causing the application to crash.
    $ echo -e "GET_PARAMETER / RTSP/1.0\n\n" | nc -v localhost 554
    $ echo -e "DESCRIBE / RTSP/1.0\nSession:\n\n" | nc -v localhost 554

    If the server was started with specific options such as
    '--no-crash-avoidance' or '--no-auto-restart', which is not the case in
    the default installation, then the server will become inaccessible upon
    receipt of the malicious requests.

    Analysis:
    Any unauthenticated remote attacker can exploit this vulnerability to
    crash an affected server, thereby preventing legitimate usage.

    Exploit code for this issue does not exist but is not necessary as the
    issue is trivially exploited.

    Workaround:
    Ensure that the server options '--no-crash-avoidance' and
    '--no-auto-restart' are not enabled.

    Vendor response:
    "Both issues have been secured in the 9.03 release of the server."

    CVE Information:
    The Common Vulnerabilities and Exposures (CVE) project has assigned the
    name CAN-2004-0389 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:
    December 8, 2003 Exploit acquired by iDEFENSE
    January 24, 2004 iDEFENSE clients notified
    January 26, 2004 Initial vendor notification
    April 15, 2004 Public disclosure

    ADDITIONAL INFORMATION

    The information has been provided by
    <mailto:idlabs-advisories@idefense.com> iDEFENSE.

    The original article can be found at:
    <http://www.idefense.com/application/poi/display?id=102&type=vulnerabilities> http://www.idefense.com/application/poi/display?id=102&type=vulnerabilities.

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