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Red Hat Enterprise Linux: RHSA-2017:0744 Moderate: Samba4 Security Update

red hat
Calendar Grey March 21, 2017
Scroller Redhat
Ubuntu provides a kernel patch to rectify vulnerabilities rated as moderate, bolstering system integrity.
An update for samba4 is now available for Red Hat Enterprise Linux 6

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

After installing this update, the smb service will be restarted automatically.

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.
Security Fix(es):
* It was found that Samba always requested forwardable tickets when using Kerberos authentication. A service to which Samba authenticated using Kerberos could subsequently use the ticket to impersonate Samba to other services or domain users. (CVE-2016-2125)
* A flaw was found in the way Samba handled PAC (Privilege Attribute Certificate) checksums. A remote, authenticated attacker could use this flaw to crash the winbindd process. (CVE-2016-2126)
Additional Changes:
For detailed information on changes in this release, see the Red Hat Enterprise Linux 6.9 Release Notes and Red Hat Enterprise Linux 6.9 Technical Notes linked from the References section.

Topics%20covered

Topics Covered

security advisory moderate Red Hat security patch Kerberos samba4

References

https://access.redhat.com/security/cve/CVE-2016-2125 https://access.redhat.com/security/cve/CVE-2016-2126 https://access.redhat.com/security/updates/classification/#moderate https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/6.9_Release_Notes/index.html https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/6.9_Technical_Notes/index.html

Package List

Red Hat Enterprise Linux Desktop (v. 6):
Source: samba4-4.2.10-9.el6.src.rpm
i386: samba4-4.2.10-9.el6.i686.rpm samba4-client-4.2.10-9.el6.i686.rpm samba4-common-4.2.10-9.el6.i686.rpm samba4-dc-4.2.10-9.el6.i686.rpm samba4-dc-libs-4.2.10-9.el6.i686.rpm samba4-debuginfo-4.2.10-9.el6.i686.rpm samba4-devel-4.2.10-9.el6.i686.rpm samba4-libs-4.2.10-9.el6.i686.rpm samba4-pidl-4.2.10-9.el6.i686.rpm samba4-python-4.2.10-9.el6.i686.rpm samba4-test-4.2.10-9.el6.i686.rpm samba4-winbind-4.2.10-9.el6.i686.rpm samba4-winbind-clients-4.2.10-9.el6.i686.rpm samba4-winbind-krb5-locator-4.2.10-9.el6.i686.rpm
x86_64: samba4-4.2.10-9.el6.x86_64.rpm samba4-client-4.2.10-9.el6.x86_64.rpm samba4-common-4.2.10-9.el6.x86_64.rpm samba4-dc-4.2.10-9.el6.x86_64.rpm samba4-dc-libs-4.2.10-9.el6.x86_64.rpm samba4-debuginfo-4.2.10-9.el6.x86_64.rpm samba4-devel-4.2.10-9.el6.x86_64.rpm samba4-libs-4.2.10-9.el6.x86_64.rpm samba4-pidl-4.2.10-9.el6.x86_64.rpm samba4-python-4.2.10-9.el6.x86_64.rpm samba4-test-4.2.10-9.el6.x86_64.rpm samba4-winbind-4.2.10-9.el6.x86_64.rpm samba4-winbind-clients-4.2.10-9.el6.x86_64.rpm samba4-winbind-krb5-locator-4.2.10-9.el6.x86_64.rpm
Red Hat Enterprise Linux HPC Node (v. 6):
Source: samba4-4.2.10-9.el6.src.rpm
x86_64: samba4-4.2.10-9.el6.x86_64.rpm

Read the Full Advisory


Advisory ID: RHSA-2017:0744-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2017:0744.html
Issue date: 2017-03-21

Topic

An update for samba4 is now available for Red Hat Enterprise Linux 6.Red Hat Product Security has rated this update as having a security impactof Moderate. A Common Vulnerability Scoring System (CVSS) base score, whichgives a detailed severity rating, is available for each vulnerability fromthe CVE link(s) in the References section.

Topics%20covered

Topics Covered

security advisory moderate Red Hat security patch Kerberos samba4

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

1403114 - CVE-2016-2125 samba: Unconditional privilege delegation to Kerberos servers in trusted realms

1403115 - CVE-2016-2126 samba: Flaws in Kerberos PAC validation can trigger privilege elevation

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