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USN-839-1: Samba vulnerabilities

1 October 2009

Samba vulnerabilities




J. David Hester discovered that Samba incorrectly handled users that lack
home directories when the automated [homes] share is enabled. An
authenticated user could connect to that share name and gain access to the
whole filesystem. (CVE-2009-2813)

Tim Prouty discovered that the smbd daemon in Samba incorrectly handled
certain unexpected network replies. A remote attacker could send malicious
replies to the server and cause smbd to use all available CPU, leading to a
denial of service. (CVE-2009-2906)

Ronald Volgers discovered that the mount.cifs utility, when installed as a
setuid program, would not verify user permissions before opening a
credentials file. A local user could exploit this to use or read the
contents of unauthorized credential files. (CVE-2009-2948)

Reinhard Ni├čl discovered that the smbclient utility contained format string
vulnerabilities in its file name handling. Because of security features in
Ubuntu, exploitation of this vulnerability is limited. If a user or
automated system were tricked into processing a specially crafted file
name, smbclient could be made to crash, possibly leading to a denial of
service. This only affected Ubuntu 8.10. (CVE-2009-1886)

Jeremy Allison discovered that the smbd daemon in Samba incorrectly handled
permissions to modify access control lists when dos filemode is enabled. A
remote attacker could exploit this to modify access control lists. This
only affected Ubuntu 8.10 and Ubuntu 9.04. (CVE-2009-1886)

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 9.04
Ubuntu 8.10
Ubuntu 8.04
Ubuntu 6.06

In general, a standard system upgrade is sufficient to effect the
necessary changes.