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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.

- Severity: 2/4
- 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

IMPACTED PRODUCTS

- 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.

CHARACTERISTICS

- Identifiers: 977290, BID-38110, CVE-2010-0035, MS10-014, VIGILANCE-VUL-9437
- Url: http://vigilance.fr/vulnerability/W...




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