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Samba: Execution of arbitrary code

Content:

1.  Gentoo Linux Security Advisory

Version Information

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



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Page updated December 10, 2007

Summary: This is a Gentoo Linux Security Advisory

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