Samba: Execution of arbitrary code

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200712-10 / samba
Release Date	December 10, 2007
Latest Revision	December 10, 2007: 01
Impact	high
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
net-fs/samba	< 3.0.28	>= 3.0.28	All supported architectures

Related bugreports: #200773

Synopsis

Samba contains a buffer overflow vulnerability potentially resulting in the execution of arbitrary code.

2. Impact Information

Background

Samba is a suite of SMB and CIFS client/server programs for UNIX.

Description

Alin Rad Pop (Secunia Research) discovered a boundary checking error in the send_mailslot() function which could lead to a stack-based buffer overflow.

Impact

A remote attacker could send a specially crafted "SAMLOGON" domain logon packet, possibly leading to the execution of arbitrary code with elevated privileges. Note that this vulnerability is exploitable only when domain logon support is enabled in Samba, which is not the case in Gentoo's default configuration.

3. Resolution Information

Workaround

Disable domain logon in Samba by setting "domain logons = no" in the "global" section of your smb.conf and restart Samba.

Resolution

All Samba users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=net-fs/samba-3.0.28"

4. References

CVE-2007-6015

Updated December 10, 2007

Summary: This is a Gentoo Linux Security Advisory

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