I tested this on the newest versions of half life dedicated servers for
Windows and Linux running the cstrike mod. These servers also run
adminmod,adminmod is what makes the "say nextmap" feature possible. I was
booted from both, anti flood protection is another part of adminmod. Perhaps
an older version of adminmod is vulnerable. I don't know of any servers
using an older version of adminmod.

Happy Thanksgiving!
Cherish the fact you may be around those family members you detest...some
people are alone and testing DoS exploits ;)
----- Original Message -----
From: "Patrick Webster" <webster_pDeMorgan.com.au>
To: "SF-Vuln-Dev (E-mail)" <vuln-devsecurityfocus.com>
Sent: Wednesday, November 27, 2002 7:12 PM
Subject: CounterStrike (HalfLife?) Server possible DoS attack.

> Hi Guys,
>
> Could someone who actually has CounterStrike on their PC look into this
for
> me and see if it still exists?
> Last I remember, it was possible to crash a CS server and thus disconnect
> all users by requesting "say nextmap" multiple times.
> To reproduce this attack, you simply bind any key to ask the server to
> display the next map - I recall it as 'say nextmap'.
> So, for example;
>
> F6 = 'say nextmap; say nextmap; say nextmap; say nextmap; say nextmap; say
> nextmap; say nextmap; say nextmap; say nextmap; say nextmap; say nextmap'
>
> Connect to a server, and rapidly press F6 until you are disconnected. Try
> and reconnect - the service should have crashed.
>
> Thanks,
>
> Patrick Webster,
> Systems Administrator
>
> DeMorgan Information Security Services
>
> Freecall: 1800 DE MO RG (33 66 74)
> Tel: +61299290377
> Fax: +61299290917
> Mob: +61403421390
>
> Address: Level 2, 41 McLaren St
> North Sydney, NSW, 2060, Australia
>
> Visit us at: www.demorgan.com.au

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