GLSA 200409-16: Samba: Denial of Service vulnerabilities

http://security.gentoo.org/

Severity:	normal
Title:	Samba: Denial of Service vulnerabilities
Date:	09/13/2004
Bugs:
ID:	200409-16

Synopsis

Two Denial of Service vulnerabilities have been found and fixed in Samba.

Background

Samba is a freely available SMB/CIFS implementation which allows seamless interoperability of file and print services to other SMB/CIFS clients. smbd and nmbd are two daemons used by the Samba server.

Affected packages

Package	Vulnerable	Unaffected	Architecture(s)
net-fs/samba	< 3.0.7	>= 3.0.7	All supported architectures

Description

There is a defect in smbd's ASN.1 parsing. A bad packet received during the authentication request could throw newly-spawned smbd processes into an infinite loop (CAN-2004-0807). Another defect was found in nmbd's processing of mailslot packets, where a bad NetBIOS request could crash the nmbd process (CAN-2004-0808).

Impact

A remote attacker could send specially crafted packets to trigger both defects. The ASN.1 parsing issue can be exploited to exhaust all available memory on the Samba host, potentially denying all service to that server. The nmbd issue can be exploited to crash the nmbd process, resulting in a Denial of Service condition on the Samba server.

Workaround

There is no known workaround at this time.

Resolution

All Samba 3.x users should upgrade to the latest version:

    # emerge sync

    # emerge -pv ">=net-fs/samba-3.0.7"
    # emerge ">=net-fs/samba-3.0.7"

References

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200409-16.xml

Concerns?

Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.