[VSA0305] HLTV remote DoS

["VOID.AT Security" <crew () void at>]

[void.at Security Advisory VSA0305]

HLTV offers the ability to have thousands of spectators watch
online games on Half-Life-servers.

Overview
========

By sending a specially crafted packet to the hltv-server,
an attacker can cause the server to crash.

Affected Versions
=================

The one that comes with hlds 3.1.1.0; possibly others.

Impact
======

Medium. The remote server simply crashes.

Details
=======

Packets querying things like player-status etc always start
with \xff\xff\xff\xff, followed by a query command and terminated
by a \0.

When you simply send \xff\xff\xff\xff\0 to the server, it crashes.

Solution
========

Vendor patch needed!

Exploit
=======

Come on :-)

Discovered by
=============

greuff <greuff () void at>

Credits
=======

void.at
everyone who was at 19c3

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