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Red Hat 7 RHSA-2017:1265-01 Moderate: Samba Security Fixes

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Calendar Grey May 22, 2017
Scroller Redhat
Uncover key samba improvements for Red Hat Enterprise Linux 7, tackling significant security vulnerabilities and system errors.
An update for samba is now available for Red Hat Enterprise Linux 7

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) protocol and the related Common Internet File System (CIFS) protocol, which allow PC-compatible machines to share files, printers, and various 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)
* A race condition was found in samba server. A malicious samba client could use this flaw to access files and directories, in areas of the server file system not exported under the share definitions. (CVE-2017-2619)
Red Hat would like to thank the Samba project for reporting CVE-2017-2619. Upstream acknowledges Jann Horn (Google) as the original reporter of CVE-2017-2619.

Topics%20covered

Topics Covered

security advisory moderate Red Hat samba bug fixes security fixes Linux

References

https://access.redhat.com/security/cve/CVE-2016-2125 https://access.redhat.com/security/cve/CVE-2016-2126 https://access.redhat.com/security/cve/CVE-2017-2619 https://access.redhat.com/security/updates/classification/#moderate

Package List

Red Hat Enterprise Linux Client (v. 7):
Source: samba-4.4.4-13.el7_3.src.rpm
noarch: samba-common-4.4.4-13.el7_3.noarch.rpm
x86_64: libsmbclient-4.4.4-13.el7_3.i686.rpm libsmbclient-4.4.4-13.el7_3.x86_64.rpm libwbclient-4.4.4-13.el7_3.i686.rpm libwbclient-4.4.4-13.el7_3.x86_64.rpm samba-client-4.4.4-13.el7_3.x86_64.rpm samba-client-libs-4.4.4-13.el7_3.i686.rpm samba-client-libs-4.4.4-13.el7_3.x86_64.rpm samba-common-libs-4.4.4-13.el7_3.x86_64.rpm samba-common-tools-4.4.4-13.el7_3.x86_64.rpm samba-debuginfo-4.4.4-13.el7_3.i686.rpm samba-debuginfo-4.4.4-13.el7_3.x86_64.rpm samba-krb5-printing-4.4.4-13.el7_3.x86_64.rpm samba-libs-4.4.4-13.el7_3.i686.rpm samba-libs-4.4.4-13.el7_3.x86_64.rpm samba-winbind-4.4.4-13.el7_3.x86_64.rpm samba-winbind-clients-4.4.4-13.el7_3.x86_64.rpm samba-winbind-modules-4.4.4-13.el7_3.i686.rpm samba-winbind-modules-4.4.4-13.el7_3.x86_64.rpm
Red Hat Enterprise Linux Client Optional (v. 7):
noarch: samba-pidl-4.4.4-13.el7_3.noarch.rpm
x86_64: libsmbclient-devel-4.4.4-13.el7_3.i686.rpm libsmbclient-devel-4.4.4-13.el7_3.x86_64.rpm libwbclient-devel-4.4.4-13.el7_3.i686.rpm libwbclient-devel-4.4.4-13.el7_3.x86_64.rpm samba-4.4.4-13.el7_3.x86_64.rpm samba-dc-4.4.4-13.el7_3.x86_64.rpm samba-dc-libs-4.4.4-13.el7_3.x86_64.rpm

Read the Full Advisory


Advisory ID: RHSA-2017:1265-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2017:1265
Issue date: 2017-05-22

Topic

An update for samba is now available for Red Hat Enterprise Linux 7.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 samba bug fixes security fixes Linux

Relevant Releases Architectures

Red Hat Enterprise Linux Client (v. 7) - noarch, x86_64

Red Hat Enterprise Linux Client Optional (v. 7) - noarch, x86_64

Red Hat Enterprise Linux ComputeNode (v. 7) - noarch, x86_64

Red Hat Enterprise Linux ComputeNode Optional (v. 7) - noarch, x86_64

Red Hat Enterprise Linux Server (v. 7) - aarch64, noarch, ppc64, ppc64le, s390x, x86_64

Red Hat Enterprise Linux Server Optional (v. 7) - aarch64, noarch, ppc64, ppc64le, s390x, x86_64

Red Hat Enterprise Linux Server Resilient Storage (v. 7) - x86_64

Red Hat Enterprise Linux Workstation (v. 7) - noarch, x86_64

Red Hat Enterprise Linux Workstation Optional (v. 7) - noarch, 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

1429472 - CVE-2017-2619 samba: symlink race permits opening files outside share directory

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