full-disclosure - Half Life dedicated server information leak and DoS

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From: 3APA3A at SECURITY.NNOV.RU (3APA3A)
Subject: Half Life dedicated server information leak and DoS

Probably is known, but is not documented:

Vendor: Valve software
Software: hlds, all versions (including steam).
Problem: Information leak, DoS
Author: SYZo[SND]

Problem:

in server configuration, if allowdownload = 1, it's possible to download
any file from directory of the current game (cstrike was tested) or from
'valve'  directory  from  server.  Allowdownload  is  required  to allow
clients to retrieve new maps from server.

Impact:

It's   possible   to  download  configuration  files  (like  server.cfg,
configuration files for different mods, etc) with sensitive information,
including  passwords.  Additionally, downloading large file (for example
map) causes server to crash.

"Exploit":

  cmd dlfile server.cfg
  cmd dlfile addons/amx/users.ini
  cmd dlfile addons/amx/mysql.cfg
  cmd dlfile maps/de_torn.bsp

Workaround:

  disable downloads.

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