--/ INTRODUCTION --

Advisory : rcon_plaintext

Release Date : 18.September 2003

Application : HLSW / rcon-console

Impact : rcon passwords can be sniffed

Vendor Status : No reply yet.

Author : Alexander 'xaitax' Hagenah [ah (at) primepage (dot) de [email concealed]]

Adrian 'p0beL' Waloschyk [aw (at) primepage (dot) de [email concealed]]

powered by http://xaitax.de

--/ SUMMARY --

There are many possibilites to administrate your Half-Life/Counter-

Strike Server.

The common is using 'rcon'. rcon can be controlled either in a

console or by using a tool called HLSW. To authentificate on the

server you send your password. The vulnerability is that rcon

isn't crypting the password, when it has been send. So it is sended

in plaintext and the server receives it in plaintext, too.

So there is no problem to sniff the password. A sniffer with some

simple filter rules can find out rcon passwords fast and easily.

--/ REPRODUCE --

Setting up a filter rule with some easy things like

Protocol: UDP

Destination Port: 27015 (for example)

Strings: 'rcon' AND 'echo'

will show you the interesting frame fast and easily.

A successfull sniff will give you an output in the data field like

this example:

<.>

....rcon 2228360 FF FF FF FF 72 63 6F 6E 20 32 32 32 38 33 36 30

724 "lena" echo 37 32 34 20 22 6C 65 6E 61 22 20 65 63 68 6F 20

HLSW: Test 48 4C 53 57 3A 20 54 65 73 74

<.>

-- PATCH /--

There are no possibilities actually as far as we know.

- ( x a i t a x - s e c u r i t y ) -

http://xaitax.de

[ reply ]