Scientific Linux Security Update : samba4 on SL6.x i386/x86_64

Critical Nessus Plugin ID 65015


The remote Scientific Linux host is missing one or more security updates.


A flaw was found in the Samba suite's Perl-based DCE/RPC IDL (PIDL) compiler, used to generate code to handle RPC calls. This could result in code generated by the PIDL compiler to not sufficiently protect against buffer overflows. (CVE-2012-1182)

The samba4 packages have been upgraded to upstream version 4.0.0, which provides a number of bug fixes and enhancements over the previous version. In particular, improved interoperability with Active Directory (AD) domains. SSSD now uses the libndr-krb5pac library to parse the Privilege Attribute Certificate (PAC) issued by an AD Key Distribution Center (KDC).

The Cross Realm Kerberos Trust functionality provided by Identity Management, which relies on the capabilities of the samba4 client library, is included as a Technology Preview. This functionality and server libraries, is included as a Technology Preview. This functionality uses the libndr-nbt library to prepare Connection-less Lightweight Directory Access Protocol (CLDAP) messages.

Additionally, various improvements have been made to the Local Security Authority (LSA) and Net Logon services to allow verification of trust from a Windows system. Because the Cross Realm Kerberos Trust functionality is considered a Technology Preview, selected samba4 components are considered to be a Technology Preview. For more information on which Samba packages are considered a Technology Preview, refer to Table 5.1, 'Samba4 Package Support' in the Release Notes, linked to from the References.

This update also fixes the following bug :

- Prior to this update, if the Active Directory (AD) server was rebooted, Winbind sometimes failed to reconnect when requested by 'wbinfo -n' or 'wbinfo -s' commands. Consequently, looking up users using the wbinfo tool failed. This update applies upstream patches to fix this problem and now looking up a Security Identifier (SID) for a username, or a username for a given SID, works as expected after a domain controller is rebooted.

Warning: If you upgrade from Scientific Linux 6.3 to Scientific Linux 6.4 and you have Samba in use, you should make sure that you uninstall the package named 'samba4' to avoid conflicts during the upgrade.


Update the affected packages.

See Also

Plugin Details

Severity: Critical

ID: 65015

File Name: sl_20130221_samba4_on_SL6_x.nasl

Version: $Revision: 1.2 $

Type: local

Agent: unix

Published: 2013/03/05

Modified: 2013/04/06

Dependencies: 12634

Risk Information

Risk Factor: Critical


Base Score: 10

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

Vulnerability Information

CPE: x-cpe:/o:fermilab:scientific_linux

Required KB Items: Host/local_checks_enabled, Host/cpu, Host/RedHat/release, Host/RedHat/rpm-list

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 2013/02/21

Exploitable With


Core Impact

Metasploit (Samba SetInformationPolicy AuditEventsInfo Heap Overflow)

Reference Information

CVE: CVE-2012-1182