RHEL 6 : samba (RHSA-2017:2778)

high Nessus Plugin ID 103453

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Synopsis

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

Description

The remote Redhat Enterprise Linux 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2017:2778 advisory.

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)

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Update the affected packages.

Plugin Details

Severity: High

ID: 103453

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

Version: 3.10

Type: local

Agent: unix

Family: Red Hat Local Security Checks

Published: 9/25/2017

Updated: 11/5/2024

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

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

Vendor

Vendor Severity: Moderate

CVSS v2

Risk Factor: Medium

Base Score: 6

Temporal Score: 4.7

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

CVSS Score Source: CVE-2017-2619

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

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

CWE: 362, 835

RHSA: 2017:2778

Detections

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