Format String Vulnerability in Valve's CS-Source

[Some One]

Hi,

if u type '%n' (without ') to in-game-console, your game crashes instantly.

So far, i was not able, to do this remotely with rcon %n e.g., but this does not mean, it is not possible.

Valve also got informed.


P.S. i want the old CS-betas back, where you needed skill instead of luck to hit the enemys head

[Some One]

In-Reply-To: <20041014192836.47e3964d.aluigi@autistici.org>

Hi,

This is way to technical for me, but i dont think so

i just found out, that not only the own client and the server crashes, if my name is '%n'! even all other conencted clients crash
>
>If this is the same bug I reported over one year ago
>http://aluigi.altervista.org/adv/hlclientfs-adv.txt probably Valve has not
>patched it yet or something similar (I don't play with Half-Life from
>years).
>
>About exploitation, the only method I found was versus the connected clients
>using the "Unknown command" reply sent by the server directly to them.
>
>
>BYEZ
>
>
>---
>Luigi Auriemma
>http://aluigi.altervista.org
>
>