[UNIX] RealNetworks RealPlayer/HelixPlayer RealPix Format String

From: SecuriTeam (support_at_securiteam.com)
Date: 10/06/05

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Date: 6 Oct 2005 16:09:22 +0200

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      RealNetworks RealPlayer/HelixPlayer RealPix Format String
    ------------------------------------------------------------------------

    SUMMARY

     <http://www.real.com/> RealPlayer is "an application for playing various
    media formats, developed by RealNetworks Inc".

    Remote exploitation of a format string vulnerability in RealPix (.rp) file
    format parser within various versions of RealNetworks Inc.'s RealPlayer
    could allow attackers to execute arbitrary code.

    DETAILS

    Vulnerable Systems:
     * Linux RealPlayer 10 versions 10.0.0 to 10.0.5
     * Helix Player versions 10.0.0 to 10.0.5

    The vulnerability specifically exists because of the improper usage of a
    formatted printing function. When a user specifies an invalid value for
    the "timeformat" attribute describing a RealPix file, the data is passed
    to the function.

    The following stripped down .rp file is sufficient enough to trigger the
    vulnerability:
       <imfl>
       <head
       title="iDEFENSE Labs RealPix Vulnerability"
       timeformat="%n%n%n%n%n%n"/>
       </imfl>

    Exploitation allows for arbitrary code execution as the user who opened
    the .rp file.

    Exploitation requires an attacker to craft a malicious .rp file and
    convince a user to open it. An attacker could also trick a user to load
    the .rp file from a normal web page under the attacker's control; this is
    possible if the user has configured their web browser to handle RealPlayer
    formats automatically.

    Workaround:
    Filter .rp attachments at e-mail gateways. Educate users about the risks
    of accepting files from untrusted individuals.

    Vendor Status:
    The vendor had released the following advisory for this vulnerability:
     <http://service.real.com/help/faq/security/050930_player/EN/>
    http://service.real.com/help/faq/security/050930_player/EN/

    CVE Information:
     <http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-2710>
    CAN-2005-2710

    Disclosure Timeline:
     * 23.08.05 - Initial vendor notification
     * 02.09.05 - Initial vendor response
     * 30.09.05 - Coordinated public disclosure

    ADDITIONAL INFORMATION

    The information has been provided by iDEFENSE.
    The original article can be found at:
    <http://www.idefense.com/application/poi/display?id=311&type=vulnerabilities> http://www.idefense.com/application/poi/display?id=311&type=vulnerabilities

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