RHEL 6 : Storage Server (RHSA-2017:2778)

high Nessus Plugin ID 103453

Synopsis

The remote Red Hat host is missing one or more security updates.

Description

An update for samba is now available for Red Hat Gluster Storage 3.3 for RHEL 6.

Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

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) :

* 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)

* A flaw was found in the way Samba handled dangling symlinks. An authenticated malicious Samba client could use this flaw to cause the smbd daemon to enter an infinite loop and use an excessive amount of CPU and memory. (CVE-2017-9461)

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.

Bug Fix(es) :

* In the samba configuration, by default the 'posix locking' is enabled and 'stat cache' is disabled. Enabling 'posix locking' sends the file lock request to the bricks too, and disabling 'stat cache' blocks samba to cache certain information at the samba layer. This led to decrease in performance of SMB access of Red Hat Gluster Storage volumes

As a fix, the following two options are included in the samba configuration file: posix locking = No stat cache = Yes

Due to this, a slight improvement in the performance is observed.
(BZ#1436265)

Solution

Update the affected packages.

See Also

https://access.redhat.com/errata/RHSA-2017:2778

https://access.redhat.com/security/cve/cve-2017-2619

https://access.redhat.com/security/cve/cve-2017-9461

Plugin Details

Severity: High

ID: 103453

File Name: redhat-RHSA-2017-2778.nasl

Version: 3.9

Type: local

Agent: unix

Published: 9/25/2017

Updated: 10/24/2019

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5.3

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

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.7

Vector: CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:redhat:enterprise_linux:ctdb, p-cpe:/a:redhat:enterprise_linux:ctdb-tests, p-cpe:/a:redhat:enterprise_linux:ldb-tools, p-cpe:/a:redhat:enterprise_linux:libldb, p-cpe:/a:redhat:enterprise_linux:libldb-debuginfo, p-cpe:/a:redhat:enterprise_linux:libldb-devel, p-cpe:/a:redhat:enterprise_linux:libsmbclient, p-cpe:/a:redhat:enterprise_linux:libsmbclient-devel, p-cpe:/a:redhat:enterprise_linux:libtalloc, p-cpe:/a:redhat:enterprise_linux:libtalloc-debuginfo, p-cpe:/a:redhat:enterprise_linux:libtalloc-devel, p-cpe:/a:redhat:enterprise_linux:libtdb, p-cpe:/a:redhat:enterprise_linux:libtdb-debuginfo, p-cpe:/a:redhat:enterprise_linux:libtdb-devel, p-cpe:/a:redhat:enterprise_linux:libtevent, p-cpe:/a:redhat:enterprise_linux:libtevent-debuginfo, p-cpe:/a:redhat:enterprise_linux:libtevent-devel, p-cpe:/a:redhat:enterprise_linux:libwbclient, p-cpe:/a:redhat:enterprise_linux:libwbclient-devel, p-cpe:/a:redhat:enterprise_linux:pyldb, p-cpe:/a:redhat:enterprise_linux:pyldb-devel, p-cpe:/a:redhat:enterprise_linux:pytalloc, p-cpe:/a:redhat:enterprise_linux:pytalloc-devel, p-cpe:/a:redhat:enterprise_linux:python-tdb, p-cpe:/a:redhat:enterprise_linux:python-tevent, p-cpe:/a:redhat:enterprise_linux:samba, p-cpe:/a:redhat:enterprise_linux:samba-client, p-cpe:/a:redhat:enterprise_linux:samba-client-libs, p-cpe:/a:redhat:enterprise_linux:samba-common, p-cpe:/a:redhat:enterprise_linux:samba-common-libs, p-cpe:/a:redhat:enterprise_linux:samba-common-tools, p-cpe:/a:redhat:enterprise_linux:samba-dc, p-cpe:/a:redhat:enterprise_linux:samba-dc-libs, p-cpe:/a:redhat:enterprise_linux:samba-debuginfo, p-cpe:/a:redhat:enterprise_linux:samba-devel, p-cpe:/a:redhat:enterprise_linux:samba-krb5-printing, p-cpe:/a:redhat:enterprise_linux:samba-libs, p-cpe:/a:redhat:enterprise_linux:samba-pidl, p-cpe:/a:redhat:enterprise_linux:samba-python, p-cpe:/a:redhat:enterprise_linux:samba-test, p-cpe:/a:redhat:enterprise_linux:samba-test-libs, p-cpe:/a:redhat:enterprise_linux:samba-vfs-glusterfs, p-cpe:/a:redhat:enterprise_linux:samba-winbind, p-cpe:/a:redhat:enterprise_linux:samba-winbind-clients, p-cpe:/a:redhat:enterprise_linux:samba-winbind-krb5-locator, p-cpe:/a:redhat:enterprise_linux:samba-winbind-modules, p-cpe:/a:redhat:enterprise_linux:tdb-tools, cpe:/o:redhat:enterprise_linux:6

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 9/21/2017

Vulnerability Publication Date: 6/6/2017

Reference Information

CVE: CVE-2017-2619, CVE-2017-9461

RHSA: 2017:2778