ID de Prueba:	1.3.6.1.4.1.25623.1.0.51569
Categoría:	Conectiva Local Security Checks
Título:	Conectiva Security Advisory CLA-2001:405
Resumen:	NOSUMMARY
Descripción:	Description: The remote host is missing updates announced in advisory CLA-2001:405. samba is a server that provides SMB services such as file and printer sharing for other SMB clients, such as Windows(R). Michal Zalewski reported a remote vulnerability that could be used to gain root privileges on the samba server. A remote attacker can set the NetBIOS name of his machine to almost any name. This string will be used in place of %m in the /etc/smb.conf configuration file. This can be used to append data that is under the attacker's control to any file on the system depending on how the %m macro is used. The published exploit relies on the log file directive as found in some configurations: log file = /var/log/samba/%m.log An attacker could abuse this configuration, which is *not* the default on Conectiva Linux, and set, for example, ../../../tmp/x as his NetBIOS name. This would trick samba into appending data to a /tmp/x.log file. If this file is a symbolic link, it will be followed. There is a limit of 16 characters for the NetBIOS name, so most attacks would probably rely on a symbolic link in /tmp or, if the %m macro is used alone (such as /var/log/samba/%m), then any file in a directory close to root (such as /bin/ls). The default configuration of log file in Conectiva Linux does not allow this kind of attack: log file = /var/log/samba/log.%m Solution: The apt tool can be used to perform RPM package upgrades by running 'apt-get update' followed by 'apt-get upgrade' http://www.securityspace.com/smysecure/catid.html?in=CLA-2001:405 http://distro.conectiva.com.br/atualizacoes/index.php?id=a&anuncio=000405 Risk factor : High
Copyright	Copyright (c) 2005 E-Soft Inc. http://www.securityspace.com

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