CentOS 6 : samba (CESA-2016:0011)

#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Red Hat Security Advisory RHSA-2016:0011 and 
# CentOS Errata and Security Advisory 2016:0011 respectively.
#

include('deprecated_nasl_level.inc');
include('compat.inc');

if (description)
{
  script_id(87784);
  script_version("2.12");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/04");

  script_cve_id("CVE-2015-5252", "CVE-2015-5296", "CVE-2015-5299");
  script_xref(name:"RHSA", value:"2016:0011");

  script_name(english:"CentOS 6 : samba (CESA-2016:0011)");
  script_summary(english:"Checks rpm output for the updated packages");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote CentOS host is missing one or more security updates."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"Updated samba packages that fix multiple security issues are now
available for Red Hat Enterprise Linux 6.

Red Hat Product Security has rated this update as having Moderate
security impact. Common Vulnerability Scoring System (CVSS) base
scores, which give detailed severity ratings, are available for each
vulnerability from the CVE links in the References section.

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.

A man-in-the-middle vulnerability was found in the way 'connection
signing' was implemented by Samba. A remote attacker could use this
flaw to downgrade an existing Samba client connection and force the
use of plain text. (CVE-2015-5296)

A missing access control flaw was found in Samba. A remote,
authenticated attacker could use this flaw to view the current
snapshot on a Samba share, despite not having DIRECTORY_LIST access
rights. (CVE-2015-5299)

An access flaw was found in the way Samba verified symbolic links when
creating new files on a Samba share. A remote attacker could exploit
this flaw to gain access to files outside of Samba's share path.
(CVE-2015-5252)

Red Hat would like to thank the Samba project for reporting these
issues. Upstream acknowledges Stefan Metzmacher of the Samba Team and
Sernet.de as the original reporters of CVE-2015-5296,
[email protected] as the original reporter of CVE-2015-5299, Jan
'Yenya' Kasprzak and the Computer Systems Unit team at Faculty of
Informatics, Masaryk University as the original reporters of
CVE-2015-5252.

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."
  );
  # https://lists.centos.org/pipermail/centos-announce/2016-January/021597.html
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?9c6ecfbb"
  );
  script_set_attribute(
    attribute:"solution", 
    value:"Update the affected samba packages."
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2015-5252");
  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:libsmbclient");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:libsmbclient-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:samba");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:samba-client");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:samba-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:samba-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:samba-domainjoin-gui");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:samba-glusterfs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:samba-swat");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:samba-winbind");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:samba-winbind-clients");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:samba-winbind-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:samba-winbind-krb5-locator");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:centos:centos:6");

  script_set_attribute(attribute:"vuln_publication_date", value:"2015/12/29");
  script_set_attribute(attribute:"patch_publication_date", value:"2016/01/07");
  script_set_attribute(attribute:"plugin_publication_date", value:"2016/01/08");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2016-2021 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"CentOS Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/CentOS/release", "Host/CentOS/rpm-list");

  exit(0);
}


include("audit.inc");
include("global_settings.inc");
include("rpm.inc");


if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
release = get_kb_item("Host/CentOS/release");
if (isnull(release) || "CentOS" >!< release) audit(AUDIT_OS_NOT, "CentOS");
os_ver = pregmatch(pattern: "CentOS(?: Linux)? release ([0-9]+)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "CentOS");
os_ver = os_ver[1];
if (! preg(pattern:"^6([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "CentOS 6.x", "CentOS " + os_ver);

if (!get_kb_item("Host/CentOS/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);


cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "CentOS", cpu);


flag = 0;
if (rpm_check(release:"CentOS-6", reference:"libsmbclient-3.6.23-24.el6_7")) flag++;
if (rpm_check(release:"CentOS-6", reference:"libsmbclient-devel-3.6.23-24.el6_7")) flag++;
if (rpm_check(release:"CentOS-6", reference:"samba-3.6.23-24.el6_7")) flag++;
if (rpm_check(release:"CentOS-6", reference:"samba-client-3.6.23-24.el6_7")) flag++;
if (rpm_check(release:"CentOS-6", reference:"samba-common-3.6.23-24.el6_7")) flag++;
if (rpm_check(release:"CentOS-6", reference:"samba-doc-3.6.23-24.el6_7")) flag++;
if (rpm_check(release:"CentOS-6", reference:"samba-domainjoin-gui-3.6.23-24.el6_7")) flag++;
if (rpm_check(release:"CentOS-6", cpu:"x86_64", reference:"samba-glusterfs-3.6.23-24.el6_7")) flag++;
if (rpm_check(release:"CentOS-6", reference:"samba-swat-3.6.23-24.el6_7")) flag++;
if (rpm_check(release:"CentOS-6", reference:"samba-winbind-3.6.23-24.el6_7")) flag++;
if (rpm_check(release:"CentOS-6", reference:"samba-winbind-clients-3.6.23-24.el6_7")) flag++;
if (rpm_check(release:"CentOS-6", reference:"samba-winbind-devel-3.6.23-24.el6_7")) flag++;
if (rpm_check(release:"CentOS-6", reference:"samba-winbind-krb5-locator-3.6.23-24.el6_7")) flag++;


if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_WARNING,
    extra      : rpm_report_get()
  );
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "libsmbclient / libsmbclient-devel / samba / samba-client / etc");
}