[NEWS] VICE Emulator Format String Vulnerability

From: SecuriTeam (support_at_securiteam.com)
Date: 06/14/04

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Date: 14 Jun 2004 10:52:01 +0200

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      VICE Emulator Format String Vulnerability
    ------------------------------------------------------------------------

    SUMMARY

     <http://www.viceteam.org/> VICE is "a program that runs on a UNIX,
    MS-DOS, Win32, OS/2, Acorn RISC OS or BeOS machine and executes programs
    intended for the old 8-bit Commodore computers. The current version
    emulates the C64, the C128, the VIC20, all the PET models (except the
    SuperPET 9000, which is out of line anyway), the PLUS4 and the CBM-II
    (a.k.a. C610)".

    There is a format string vulnerability in the handling of the monitor
    "memory dump" command. If the string to be output contains any % sign, it
    is interpreted as a command for the output, normally resulting in a crash.
    Even more sophisticated exploits, like arbitrary code execution on the
    host machine, are possible.

    DETAILS

    Vulnerable Systems:
     * VICE version 1.6 up to version 1.14 on all platforms

    Impact:
    It is possible to crash the emulator or even execute arbitrary code on the
    host machine from the inside of the emulated machine. For this, an
    attacker needs to fill up parts of the memory with a specific value and
    wheedle the user to enter the monitor and type in a specific command.

     Without the user being wheedled to enter the monitor and type in that
    specific command, this vulnerability is not exploitable.

    Solution:
     Upgrade to a newer version of VICE as soon as it becomes available, or
    use the attached security patch at:
    <http://www.trikaliotis.net/vicekb/vice-1.14-mon-vuln.diff.gz>
    http://www.trikaliotis.net/vicekb/vice-1.14-mon-vuln.diff.gz.

    CVE Information:
     <http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0453>
    CAN-2004-0453

    Disclosure Timeline:
    June 8, 2004: The VICE team has been informed about this vulnerability
    June 8, 2004: The VICE team releases an internal patch the fix this
    vulnerability
    June 10, 2004: First Linux distributors are being contacted.
    June 14, 2004: Publication of this flaw

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:trik-news@gmx.de> Spiro
    Trikaliotis.
    The original article can be found at:
    <http://www.trikaliotis.net/vicekb/vsa-2004-1>
    http://www.trikaliotis.net/vicekb/vsa-2004-1

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