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Vigil@nce: Samba, several vulnerabilities

October 2009 by Vigil@nce

An attacker can use several vulnerabilities of Samba, in order to
access to files, or to generate a denial of service.

Severity: 2/4

Consequences: data reading, data creation/edition, data deletion,
denial of service of service

Provenance: user account

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)

Number of vulnerabilities in this bulletin: 3

Creation date: 02/10/2009

IMPACTED PRODUCTS

 Fedora
 Samba
 Slackware Linux

DESCRIPTION OF THE VULNERABILITY

Several vulnerabilities were announced in Samba.

When the home directory of a user in /etc/passwd is empty, his
"[homes]" share uses the root of the system. This user can
therefore for example read files under /etc, or create files under
/tmp. [grav:2/4; CVE-2009-2813]

When mount.cifs is installed suid root, a local attacker can use
the "—verbose" option in order to display the first line of a
read protected file. [grav:1/4; CVE-2009-2948]

An authenticated attacker can use a malformed SMB query, in order
to generate an infinite loop. [grav:1/4; CVE-2009-2906]

An attacker can therefore use several vulnerabilities of Samba, in
order to access to files, or to generate a denial of service.

CHARACTERISTICS

Identifiers: CVE-2009-2813, CVE-2009-2906, CVE-2009-2948,
FEDORA-2009-10172, FEDORA-2009-10180, SSA:2009-276-01,
VIGILANCE-VUL-9065

http://vigilance.fr/vulnerability/Samba-several-vulnerabilities-9065


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