CentOS 6 : samba4 (CESA-2017:2791)

#%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-2017:2791 and 
# CentOS Errata and Security Advisory 2017:2791 respectively.
#

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

if (description)
{
  script_id(103387);
  script_version("3.12");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/04");

  script_cve_id("CVE-2017-12150", "CVE-2017-12163");
  script_xref(name:"RHSA", value:"2017:2791");

  script_name(english:"CentOS 6 : samba4 (CESA-2017:2791)");
  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:
"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
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) 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 did not enforce 'SMB signing' when certain
configuration options were enabled. A remote attacker could launch a
man-in-the-middle attack and retrieve information in plain-text.
(CVE-2017-12150)

* An information leak flaw was found in the way SMB1 protocol was
implemented by Samba. A malicious client could use this flaw to dump
server memory contents to a file on the samba share or to a shared
printer, though the exact area of server memory cannot be controlled
by the attacker. (CVE-2017-12163)

Red Hat would like to thank the Samba project for reporting
CVE-2017-12150 and Yihan Lian and Zhibin Hu (Qihoo 360 GearTeam),
Stefan Metzmacher (SerNet), and Jeremy Allison (Google) for reporting
CVE-2017-12163. Upstream acknowledges Stefan Metzmacher (SerNet) as
the original reporter of CVE-2017-12150."
  );
  # https://lists.centos.org/pipermail/centos-announce/2017-September/022544.html
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?e5184489"
  );
  script_set_attribute(
    attribute:"solution", 
    value:"Update the affected samba4 packages."
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/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:H/PR:N/UI:N/S:U/C:H/I:H/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-2017-12150");
  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:samba4");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:samba4-client");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:samba4-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:samba4-dc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:samba4-dc-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:samba4-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:samba4-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:samba4-pidl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:samba4-python");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:samba4-test");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:samba4-winbind");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:samba4-winbind-clients");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:samba4-winbind-krb5-locator");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:centos:centos:6");

  script_set_attribute(attribute:"vuln_publication_date", value:"2018/07/26");
  script_set_attribute(attribute:"patch_publication_date", value:"2017/09/21");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/09/22");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2017-2021 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:"samba4-4.2.10-11.el6_9")) flag++;
if (rpm_check(release:"CentOS-6", reference:"samba4-client-4.2.10-11.el6_9")) flag++;
if (rpm_check(release:"CentOS-6", reference:"samba4-common-4.2.10-11.el6_9")) flag++;
if (rpm_check(release:"CentOS-6", reference:"samba4-dc-4.2.10-11.el6_9")) flag++;
if (rpm_check(release:"CentOS-6", reference:"samba4-dc-libs-4.2.10-11.el6_9")) flag++;
if (rpm_check(release:"CentOS-6", reference:"samba4-devel-4.2.10-11.el6_9")) flag++;
if (rpm_check(release:"CentOS-6", reference:"samba4-libs-4.2.10-11.el6_9")) flag++;
if (rpm_check(release:"CentOS-6", reference:"samba4-pidl-4.2.10-11.el6_9")) flag++;
if (rpm_check(release:"CentOS-6", reference:"samba4-python-4.2.10-11.el6_9")) flag++;
if (rpm_check(release:"CentOS-6", reference:"samba4-test-4.2.10-11.el6_9")) flag++;
if (rpm_check(release:"CentOS-6", reference:"samba4-winbind-4.2.10-11.el6_9")) flag++;
if (rpm_check(release:"CentOS-6", reference:"samba4-winbind-clients-4.2.10-11.el6_9")) flag++;
if (rpm_check(release:"CentOS-6", reference:"samba4-winbind-krb5-locator-4.2.10-11.el6_9")) 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, "samba4 / samba4-client / samba4-common / samba4-dc / samba4-dc-libs / etc");
}