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Vigil@nce: Samba, exiting the root directory

February 2010 by Vigil@nce

SYNTHESIS OF THE VULNERABILITY

In the default writable share configuration, Samba allows the creation of symbolic links pointing outside the shared root.

Severity: 2/4

Consequences: data reading, data creation/edition, data deletion

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)

Creation date: 08/02/2010

IMPACTED PRODUCTS

- Samba

DESCRIPTION OF THE VULNERABILITY The Samba service has several configuration directives:

- writable : the SMB/CIFS share is writable (disabled by default)
- unix extensions: Unix extensions, such as the symbolic link creation, are allowed (enabled by default)
- wide links: symbolic links pointing outside the share root directory are allowed (enabled by default)
- etc.

When the administrator enables "writable", but without disabling "unix extensions" nor "wide links", an authenticated attacker can thus create a symbolic link pointing outside the share root.

In this configuration, the attacker can therefore read or edit files located outside the share root.

CHARACTERISTICS

Identifiers: BID-38111, VIGILANCE-VUL-9413

http://vigilance.fr/vulnerability/S...




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