CentOS 7 : samba (CESA-2017:1950)

#%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-2017:1950 and 
# CentOS Errata and Security Advisory 2017:1950 respectively.
#

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

if (description)
{
  script_id(102745);
  script_version("3.8");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/04");

  script_cve_id("CVE-2017-9461");
  script_xref(name:"RHSA", value:"2017:1950");

  script_name(english:"CentOS 7 : samba (CESA-2017:1950)");
  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 samba is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security
impact of Low. 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.

The following packages have been upgraded to a later upstream version:
samba (4.6.2). (BZ#1391954)

Security Fix(es) :

* 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)

Additional Changes :

For detailed information on changes in this release, see the Red Hat
Enterprise Linux 7.4 Release Notes linked from the References section."
  );
  # https://lists.centos.org/pipermail/centos-cr-announce/2017-August/004532.html
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?fea5b705"
  );
  script_set_attribute(
    attribute:"solution", 
    value:"Update the affected samba packages."
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:N/I:N/A:C");
  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:L/UI:N/S:U/C:N/I:N/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2017-9461");
  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:ctdb");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:ctdb-tests");
  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:libwbclient");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:libwbclient-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-client-libs");
  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-common-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:samba-common-tools");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:samba-dc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:samba-dc-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:samba-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:samba-krb5-printing");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:samba-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:samba-pidl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:samba-python");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:samba-test");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:samba-test-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:samba-vfs-glusterfs");
  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-krb5-locator");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:samba-winbind-modules");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:centos:centos:7");

  script_set_attribute(attribute:"vuln_publication_date", value:"2017/06/06");
  script_set_attribute(attribute:"patch_publication_date", value:"2017/08/23");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/08/25");
  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:"^7([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "CentOS 7.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-7", cpu:"x86_64", reference:"ctdb-4.6.2-8.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"ctdb-tests-4.6.2-8.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"libsmbclient-4.6.2-8.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"libsmbclient-devel-4.6.2-8.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"libwbclient-4.6.2-8.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"libwbclient-devel-4.6.2-8.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"samba-4.6.2-8.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"samba-client-4.6.2-8.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"samba-client-libs-4.6.2-8.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"samba-common-4.6.2-8.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"samba-common-libs-4.6.2-8.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"samba-common-tools-4.6.2-8.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"samba-dc-4.6.2-8.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"samba-dc-libs-4.6.2-8.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"samba-devel-4.6.2-8.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"samba-krb5-printing-4.6.2-8.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"samba-libs-4.6.2-8.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"samba-pidl-4.6.2-8.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"samba-python-4.6.2-8.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"samba-test-4.6.2-8.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"samba-test-libs-4.6.2-8.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"samba-vfs-glusterfs-4.6.2-8.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"samba-winbind-4.6.2-8.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"samba-winbind-clients-4.6.2-8.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"samba-winbind-krb5-locator-4.6.2-8.el7")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"samba-winbind-modules-4.6.2-8.el7")) flag++;


if (flag)
{
  cr_plugin_caveat = '\n' +
    'NOTE: The security advisory associated with this vulnerability has a\n' +
    'fixed package version that may only be available in the continuous\n' +
    'release (CR) repository for CentOS, until it is present in the next\n' +
    'point release of CentOS.\n\n' +

    'If an equal or higher package level does not exist in the baseline\n' +
    'repository for your major version of CentOS, then updates from the CR\n' +
    'repository will need to be applied in order to address the\n' +
    'vulnerability.\n';
  security_report_v4(
    port       : 0,
    severity   : SECURITY_WARNING,
    extra      : rpm_report_get() + cr_plugin_caveat
  );
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "ctdb / ctdb-tests / libsmbclient / libsmbclient-devel / libwbclient / etc");
}