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Vigil@nce - Samba: denial of service via NetBIOS

October 2010 by Vigil@nce

This bulletin was written by Vigil@nce : http://vigilance.fr/

SYNTHESIS OF THE VULNERABILITY

An attacker can send a malicious NetBIOS packet, in order to stop
Samba.

Severity: 2/4

Creation date: 11/10/2010

DESCRIPTION OF THE VULNERABILITY

The NetBIOS protocol provides 3 services:
 Name Service : registration and resolution of computer names
 Session Service and Datagram Service : exchange of messages

The Session Service uses several types of packets (RFC 1002):
 0x00 : message
 0x81 : request
 etc.

However, if the name associated to a 0x81 query is too long, an
assertion error occurs in Samba.

An attacker can therefore send a malicious NetBIOS packet, in
order to stop Samba.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/Samba-denial-of-service-via-NetBIOS-10013


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