Vigil@nce: Windows 2000, 2003, 2008: denial of service via Kerberos
February 2010 by Vigil@nce
An authenticated attacker can generate a denial of service on the domain controller.
Consequences: denial of service of computer, denial of service of service
Provenance: intranet client
Means of attack: no proof of concept, no attack
Ability of attacker: expert (4/4)
Confidence: confirmed by the editor (5/5)
Diffusion of the vulnerable configuration: high (3/3)
Creation date: 10/02/2010
Microsoft Windows 2000
Microsoft Windows 2003
Microsoft Windows 2008
DESCRIPTION OF THE VULNERABILITY
A domain controller (Active Directory) uses the Kerberos protocol.
According to the Kerberos protocol, when a user wants to authenticate on a computer, it asks a TGT (Ticket Granting Ticket) to the KDC (AD) server. The user has to use a valid password to decrypt this TGT, which is for example valid during 8 hours. The computer can then ask the KDC to renew the TGT.
However, if the renewal query is malformed, and is sent to a server configured in mixed mode, an error occurs and stops the system.
An authenticated attacker can therefore generate a denial of service on the domain controller.
Identifiers: 977290, BID-38110, CVE-2010-0035, MS10-014,