Half-Life Server multiple player denial of service
|halflife-multiple-player-dos (9412)||Medium Risk|
Valve Software's Half-Life Server is vulnerable to a denial of service attack. Normally, a single cd key allows for a maximum of four players from the same server. However, a remote attacker could send a connection request with a specially-crafted %cd_key parameter, which would allow the attacker to create new players above the four player limit until the maximum amount of players allowed for that game server has been reached. Once this occurs, legitimate users would be unable to connect to the game server.
Denial of Service
No remedy available as of February 1, 2014.
- BugTraq Mailing List, Mon Jun 24 2002 - 14:47:34 CDT: Re: Half-life fake players bug (update).
- BugTraq Mailing List, Thu Jun 20 2002 - 14:00:03 CDT: Half-life fake players bug.
- BID-5076: Half-Life Server New Player Flood Denial Of Service Vulnerability
- CVE-2002-0964: Half-Life Server 22.214.171.124 and earlier allows remote attackers to cause a denial of service (resource exhaustion) via multiple responses to the initial challenge with different cd_key values, which reaches the player limit and prevents other players from connecting until the original responses have timed out.
- OSVDB ID: 5001: Half-Life Server cd_key DoS
- Sierra Half-Life Dedicated Server
- Sierra Half-Life Server
Jun 20, 2002
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