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Red Hat Enterprise Linux 6: RHSA-2015-0250 Critical Samba4 RCE

red hat
Calendar Grey February 23, 2015
Dist Redhat Esm H88
New samba4 updates address a significant vulnerability in Red Hat Enterprise Linux 6, providing improved security and reliability.
Updated samba4 packages that fix one security issue are now available for Red Hat Enterprise Linux 6

Solution

Before applying this update, make sure all previously released errata relevant to your system have been applied.

This update is available via the Red Hat Network. Details on how to use the Red Hat Network to apply this update are available at https://access.redhat.com/articles/11258

Summary

Samba is an open-source implementation of the Server Message Block (SMB) or Common Internet File System (CIFS) protocol, which allows PC-compatible machines to share files, printers, and other information.
An uninitialized pointer use flaw was found in the Samba daemon (smbd). A malicious Samba client could send specially crafted netlogon packets that, when processed by smbd, could potentially lead to arbitrary code execution with the privileges of the user running smbd (by default, the root user). (CVE-2015-0240)
For additional information about this flaw, see the Knowledgebase article at https://access.redhat.com/articles/1346913
Red Hat would like to thank the Samba project for reporting this issue. Upstream acknowledges Richard van Eeden of Microsoft Vulnerability Research as the original reporter of this issue.
All Samba users are advised to upgrade to these updated packages, which contain a backported patch to correct this issue. After installing this update, the smb service will be restarted automatically.

Topics%20covered

Topics Covered

security advisory security update critical remote code execution arbitrary code execution samba Red Hat Enterprise Linux

References

https://access.redhat.com/security/cve/CVE-2015-0240 https://access.redhat.com/security/updates/classification#critical https://access.redhat.com/articles/1346913

Package List

Red Hat Enterprise Linux Desktop (v. 6):
Source: samba4-4.0.0-66.el6_6.rc4.src.rpm
i386: samba4-4.0.0-66.el6_6.rc4.i686.rpm samba4-client-4.0.0-66.el6_6.rc4.i686.rpm samba4-common-4.0.0-66.el6_6.rc4.i686.rpm samba4-dc-4.0.0-66.el6_6.rc4.i686.rpm samba4-dc-libs-4.0.0-66.el6_6.rc4.i686.rpm samba4-debuginfo-4.0.0-66.el6_6.rc4.i686.rpm samba4-devel-4.0.0-66.el6_6.rc4.i686.rpm samba4-libs-4.0.0-66.el6_6.rc4.i686.rpm samba4-pidl-4.0.0-66.el6_6.rc4.i686.rpm samba4-python-4.0.0-66.el6_6.rc4.i686.rpm samba4-swat-4.0.0-66.el6_6.rc4.i686.rpm samba4-test-4.0.0-66.el6_6.rc4.i686.rpm samba4-winbind-4.0.0-66.el6_6.rc4.i686.rpm samba4-winbind-clients-4.0.0-66.el6_6.rc4.i686.rpm samba4-winbind-krb5-locator-4.0.0-66.el6_6.rc4.i686.rpm
x86_64: samba4-4.0.0-66.el6_6.rc4.x86_64.rpm samba4-client-4.0.0-66.el6_6.rc4.x86_64.rpm samba4-common-4.0.0-66.el6_6.rc4.x86_64.rpm samba4-dc-4.0.0-66.el6_6.rc4.x86_64.rpm samba4-dc-libs-4.0.0-66.el6_6.rc4.x86_64.rpm samba4-debuginfo-4.0.0-66.el6_6.rc4.x86_64.rpm samba4-devel-4.0.0-66.el6_6.rc4.x86_64.rpm samba4-libs-4.0.0-66.el6_6.rc4.x86_64.rpm samba4-pidl-4.0.0-66.el6_6.rc4.x86_64.rpm samba4-python-4.0.0-66.el6_6.rc4.x86_64.rpm samba4-swat-4.0.0-66.el6_6.rc4.x86_64.rpm samba4-test-4.0.0-66.el6_6.rc4.x86_64.rpm

Read the Full Advisory


Severity
critical
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2015:0250-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2015:0250.html
Issue date: 2015-02-23

Topic

Updated samba4 packages that fix one security issue are now available forRed Hat Enterprise Linux 6.Red Hat Product Security has rated this update as having Critical securityimpact. A Common Vulnerability Scoring System (CVSS) base score, whichgives a detailed severity rating, is available from the CVE link in theReferences section.

Topics%20covered

Topics Covered

security advisory security update critical remote code execution arbitrary code execution samba Red Hat Enterprise Linux

Relevant Releases Architectures

Red Hat Enterprise Linux Desktop (v. 6) - i386, x86_64

Red Hat Enterprise Linux HPC Node (v. 6) - x86_64

Red Hat Enterprise Linux Server (v. 6) - i386, ppc64, s390x, x86_64

Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64

Bugs Fixed

1191325 - CVE-2015-0240 samba: talloc free on uninitialized stack pointer in netlogon server could lead to remote-code execution

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