█ xbox h4x0r'd ?
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  1. #1
    Senior Member tampabay420's Avatar
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    Aug 2002

    █ xbox h4x0r'd ?

    hey all... just saw this article... found it pretty interesting... hopefully we will all be running linux off of our game stations


    Xbox hacker group threatens Microsoft over Linux
    Rob Fahey 16:12 30/06/2003

    Redmond on the receiving end of blackmail as Xbox security is breached again

    A team of researchers claim to have found a new way to make the Xbox boot the Linux operating system without using a mod chip, and is threatening to release details unless Microsoft approves an official system for running Xbox Linux.

    The hackers involved, who are believed to be based in Australia, want Microsoft to release an official boot loader for the Xbox which will enable the use of the Linux operating system on consoles without any security bypasses.

    If Microsoft won't discuss this with them, they say, they'll release information about their new Xbox hack onto the Internet - which will equally allow the running of Linux on the Xbox, but would also by its nature have the side effect of enabling the running of pirated games on the console.

    The group's threat, which sounds suspiciously like blackmail to us, became public when they approached ZDNet Australia after repeated attempts to contact Microsoft failed. Microsoft now says the issue is with its piracy division.
    yeah, I\'m gonna need that by friday...

  2. #2
    Senior Member tampabay420's Avatar
    Join Date
    Aug 2002
    fresh off packetstorm...
    XBOX Security

    -= Security Advisory =-

    Advisory: XBOX Dashboard local vulnerability
    Release Date: 2003/07/04
    Last Modified: 2003/07/04
    Author: Stefan Esser [se@nopiracy.de]

    Application: Microsoft XBOX Dashboard (up to today)
    Severity: A vulnerability within the XBOX Dashboard allows to
    totally compromise the security features of the XBOX.
    Risk: Critical
    Vendor Status: Vendor is not willing to talk about XBOX vulnerabilities.


    The XBOX Dashboard is what appears when you turn the XBOX on without a
    disc in the DVD drive. It will let you adjust system settings, manage
    your save games, play and rip audio CDs and configure your XBOX Live
    account. It is the heart of the XBOX and its most vulnerable point,
    because it lacks several security restrictions which are enforced on
    games. This includes the lack of the reboot-on-eject-button "feature",
    which is obligatory for all games.

    The existance of an exploitable vulnerability within the dashboard could
    totally compromises the XBOX security system. It will make the box
    independent from Microsoft signed code and therefore this information is
    released to the public now on the 4th of July 2003, the day of the XBOX


    Microsoft knows that a vulnerability within the XBOX dashboard could
    have serious impact. This is underlined by the fact that the dashboard
    checks most of its files against an internal stored SHA1 hash value
    before it uses them.

    For an unknown reason this check is not performed on the audio (.wav)
    and font (.xtf) files. Unfourtunately for Microsoft there exists an
    exploitable integer underflow vulnerabilitiy within the font file loader
    which can be exploited with a malformed font file. When the XTF header
    is processed the dashboards reads a 4 byte blocksize field from the font
    file. This is expected to represent the size of some datablock including
    the 4 bytes of the size field itself. The blocksize is then allocated
    and the sizefield is copied into the beginning of the buffer. This is
    already a possible overflow bug when the field contains the values 0..3.
    Due to memory alignment this is not exploitable. But then the blocksize
    is decreased by 4 because the dashboard wants to read the rest of the
    block into memory. Obviously values of 0..3 will underflow when
    decreased by 4 and this results in the dashboard wanting to read up to
    ~4 gigabytes of data from the font file in a f.e. 3 bytes buffer.

    Because the XBOX malloc()/free() implementation is also storing control
    information inbound and is similiar to the Windows 2000/XP heap
    allocators this bug is exploitable and allows execution of arbitrary
    code. The attached proof of concept code shows that exploiting is
    possible with offsets that are equal on all dashboards and XBOX versions

    BTW: the dashboard loads its font files directly after the XBOX start
    animation. This means the exploit does not need any user
    interaction and when the code is executed only part of the
    dashboard background is on screen.

    Proof of Concept:

    Attached you will find a proof of concept exploit which will start
    linux. To install it you have to rename the 2 XBOX font files within the
    font directory of the dashboard partition and then copy ernie.xtf and
    bert.xtf into this directory. (If you have an XBOX with an older
    dashboard the font directory does not exist and you must do the renaming
    and file adding work in the main directory). Once the new fonts are in
    place you copy the default.xbe (which is a copy of xbeboot) into the
    main directory and add your favourite linux to it.

    Trustworthy Computing:

    Trustworthy Computing at its best. Nearly 2 Years ago I reported an SSL
    vulnerability within IE to Microsoft. 1 month later I released
    information about this bug to the public because MS did absolutely
    nothing. The vulnerability was nearly forgotten, it only exists on the
    list of 19 unpatched IE vulnerabilities anymore. But this is wrong, the
    vulnerability was indeed fixed with one of the many IE patches in the
    middle of last year. Well is secretly fixing bugs without an official
    advisory trustworthy?

    Anticipated Questions:

    Q1: How do I get the files onto the harddisk?

    A1: There are several ways. You could f.e. install the files with the
    Mechassault or 007 hacks. This requires one of the games and the
    files on a memorycard. The other way is to open the box and do the
    harddisk swap trick which is described all over the net.

    Q2: This vulnerability is in the dashboard, isn't it? So Microsoft can
    simply update the dashboard with XBOX Live or with the help of new

    A2: Yes Microsoft could try to upgrade the dashboard and fix the
    vulnerability with such an update, but keep in mind that this
    vulnerability is like a "local root" hole. You can do nearly
    everything with it and this includes redirecting reads and writes to
    the xboxdash.xbe file. Additionally people who do not play games on
    their box will not be reachable with such updates. And groups who
    pirate games can always disable the update feature.

    Q3: Well but MS can make the kernel block the vulnerable dashboard.

    A3: Indeed they can. But until boxes with new kernels reach the market
    we will have the end of this year (You can still get 1.0 boxes in
    shops over here) and they can only fix the bugs they know about.

    Q4: Is it possible to play "backed-up" games with this?

    A4: Yes it is possible to play pirated games by using this vulnerability
    but my proof of concept code will not allow this. You have to change
    the exploit to patch the kernel in memory. This is not very hard and
    I am not going to help you with this.

    Q5: Can I go "Live" with this hack?

    A5: You have full control over the box with this vulnerability. You can
    modify the exploit to allow XBOX Live playing but this will only
    start a cat & mouse game with Microsoft.

    Q6: I have read that I can solder my mainboard with this hack...

    A6: This exploit has nothing to do with soldering, It will just run
    everything you want on unmodded (and even unopened) XBOXes. Infact
    when this hack is installed you do not need to solder anything to
    get your homebrew or whatever applications to run.

    Copyright 2003 Stefan Esser. All rights reserved.
    you can find the rest, including .tgz at -> http://packetstorm.linuxsecurity.com...es/xbox001.txt
    yeah, I\'m gonna need that by friday...

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