RHEL 6 : samba (RHSA-2019:4023)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Red Hat Security Advisory RHSA-2019:4023. The text 
# itself is copyright (C) Red Hat, Inc.
#

include('compat.inc');

if (description)
{
  script_id(131525);
  script_version("1.6");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/11/06");

  script_cve_id("CVE-2019-10197");
  script_xref(name:"RHSA", value:"2019:4023");

  script_name(english:"RHEL 6 : samba (RHSA-2019:4023)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Red Hat host is missing a security update for samba.");
  script_set_attribute(attribute:"description", value:
"The remote Redhat Enterprise Linux 6 host has packages installed that are affected by a vulnerability as referenced in
the RHSA-2019:4023 advisory.

    Samba is an open-source implementation of the Server Message Block (SMB) protocol and the related Common
    Internet File System (CIFS) protocol, which allows PC-compatible machines to share files, printers, and
    various information.

    The following packages have been upgraded to a later upstream version: samba (4.9.8). (BZ#1724260)

    Security Fix(es):

    * samba: Combination of parameters and permissions can allow the user to escape from the share path
    definition (CVE-2019-10197)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and
    other related information, refer to the CVE page(s) listed in the References section.

    Bug Fix(es):

    * The samba packages have been upgraded to upstream version 4.9.8 which provides a number of bug fixes and
    enhancements over the previous version. (BZ#1724260)

    * Previously, CTDB was unable to start due to a missing filesystem directory. In spite of manually
    creating the directory, CTDB could not function properly due to an incorrect SELinux context. With this
    update, the rpm package now properly creates the missing directory with the required SELinux context and
    CTDB starts correctly. (BZ#1772836)

    Users of Samba with Red Hat Gluster Storage are advised to upgrade to these updated packages.

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

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  # https://security.access.redhat.com/data/csaf/v2/advisories/2019/rhsa-2019_4023.json
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?1f7a9bd7");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/errata/RHSA-2019:4023");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/updates/classification/#moderate");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1724260");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1746225");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1772836");
  script_set_attribute(attribute:"solution", value:
"Update the RHEL samba package based on the guidance in RHSA-2019:4023.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/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:L/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-2019-10197");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_cwe_id(22);
  script_set_attribute(attribute:"vendor_severity", value:"Moderate");

  script_set_attribute(attribute:"vuln_publication_date", value:"2019/09/03");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/12/02");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/12/03");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:ctdb");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:libsmbclient");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:libsmbclient-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:libwbclient");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:libwbclient-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:samba");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:samba-client");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:samba-client-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:samba-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:samba-common-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:samba-common-tools");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:samba-dc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:samba-dc-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:samba-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:samba-krb5-printing");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:samba-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:samba-pidl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:samba-python");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:samba-vfs-glusterfs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:samba-winbind");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:samba-winbind-clients");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:samba-winbind-krb5-locator");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:samba-winbind-modules");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:6");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Red Hat Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2019-2024 and is owned by Tenable, Inc. or an Affiliate thereof.");

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

  exit(0);
}


include('rpm.inc');
include('rhel.inc');

if (!get_kb_item('Host/local_checks_enabled')) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var os_release = get_kb_item('Host/RedHat/release');
if (isnull(os_release) || 'Red Hat' >!< os_release) audit(AUDIT_OS_NOT, 'Red Hat');
var os_ver = pregmatch(pattern: "Red Hat Enterprise Linux.*release ([0-9]+(\.[0-9]+)?)", string:os_release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, 'Red Hat');
os_ver = os_ver[1];
if (!rhel_check_release(operator: 'ge', os_version: os_ver, rhel_version: '6')) audit(AUDIT_OS_NOT, 'Red Hat 6.x', 'Red Hat ' + os_ver);

if (!get_kb_item('Host/RedHat/rpm-list')) audit(AUDIT_PACKAGE_LIST_MISSING);

var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 's390' >!< cpu && 'aarch64' >!< cpu && 'ppc' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Red Hat', cpu);

var constraints = [
  {
    'repo_relative_urls': [
      'content/dist/rhel/server/6/6Server/x86_64/rh-gluster-samba/3/debug',
      'content/dist/rhel/server/6/6Server/x86_64/rh-gluster-samba/3/os',
      'content/dist/rhel/server/6/6Server/x86_64/rh-gluster-samba/3/source/SRPMS'
    ],
    'pkgs': [
      {'reference':'ctdb-4.9.8-110.el6rhs', 'cpu':'x86_64', 'release':'6', 'el_string':'el6rhs', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'glusterfs'},
      {'reference':'libsmbclient-4.9.8-110.el6rhs', 'cpu':'x86_64', 'release':'6', 'el_string':'el6rhs', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'glusterfs'},
      {'reference':'libsmbclient-devel-4.9.8-110.el6rhs', 'cpu':'x86_64', 'release':'6', 'el_string':'el6rhs', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'glusterfs'},
      {'reference':'libwbclient-4.9.8-110.el6rhs', 'cpu':'x86_64', 'release':'6', 'el_string':'el6rhs', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'glusterfs'},
      {'reference':'libwbclient-devel-4.9.8-110.el6rhs', 'cpu':'x86_64', 'release':'6', 'el_string':'el6rhs', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'glusterfs'},
      {'reference':'samba-4.9.8-110.el6rhs', 'cpu':'x86_64', 'release':'6', 'el_string':'el6rhs', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'glusterfs'},
      {'reference':'samba-client-4.9.8-110.el6rhs', 'cpu':'x86_64', 'release':'6', 'el_string':'el6rhs', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'glusterfs'},
      {'reference':'samba-client-libs-4.9.8-110.el6rhs', 'cpu':'x86_64', 'release':'6', 'el_string':'el6rhs', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'glusterfs'},
      {'reference':'samba-common-4.9.8-110.el6rhs', 'release':'6', 'el_string':'el6rhs', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'glusterfs'},
      {'reference':'samba-common-libs-4.9.8-110.el6rhs', 'cpu':'x86_64', 'release':'6', 'el_string':'el6rhs', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'glusterfs'},
      {'reference':'samba-common-tools-4.9.8-110.el6rhs', 'cpu':'x86_64', 'release':'6', 'el_string':'el6rhs', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'glusterfs'},
      {'reference':'samba-dc-4.9.8-110.el6rhs', 'cpu':'x86_64', 'release':'6', 'el_string':'el6rhs', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'glusterfs'},
      {'reference':'samba-dc-libs-4.9.8-110.el6rhs', 'cpu':'x86_64', 'release':'6', 'el_string':'el6rhs', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'glusterfs'},
      {'reference':'samba-devel-4.9.8-110.el6rhs', 'cpu':'x86_64', 'release':'6', 'el_string':'el6rhs', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'glusterfs'},
      {'reference':'samba-krb5-printing-4.9.8-110.el6rhs', 'cpu':'x86_64', 'release':'6', 'el_string':'el6rhs', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'glusterfs'},
      {'reference':'samba-libs-4.9.8-110.el6rhs', 'cpu':'x86_64', 'release':'6', 'el_string':'el6rhs', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'glusterfs'},
      {'reference':'samba-pidl-4.9.8-110.el6rhs', 'release':'6', 'el_string':'el6rhs', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'glusterfs'},
      {'reference':'samba-python-4.9.8-110.el6rhs', 'cpu':'x86_64', 'release':'6', 'el_string':'el6rhs', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'glusterfs'},
      {'reference':'samba-vfs-glusterfs-4.9.8-110.el6rhs', 'cpu':'x86_64', 'release':'6', 'el_string':'el6rhs', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'glusterfs'},
      {'reference':'samba-winbind-4.9.8-110.el6rhs', 'cpu':'x86_64', 'release':'6', 'el_string':'el6rhs', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'glusterfs'},
      {'reference':'samba-winbind-clients-4.9.8-110.el6rhs', 'cpu':'x86_64', 'release':'6', 'el_string':'el6rhs', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'glusterfs'},
      {'reference':'samba-winbind-krb5-locator-4.9.8-110.el6rhs', 'cpu':'x86_64', 'release':'6', 'el_string':'el6rhs', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'glusterfs'},
      {'reference':'samba-winbind-modules-4.9.8-110.el6rhs', 'cpu':'x86_64', 'release':'6', 'el_string':'el6rhs', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'glusterfs'}
    ]
  }
];

var applicable_repo_urls = rhel_determine_applicable_repository_urls(constraints:constraints);
if(applicable_repo_urls == RHEL_REPOS_NO_OVERLAP_MESSAGE) exit(0, RHEL_REPO_NOT_ENABLED);

var flag = 0;
foreach var constraint_array ( constraints ) {
  var repo_relative_urls = NULL;
  if (!empty_or_null(constraint_array['repo_relative_urls'])) repo_relative_urls = constraint_array['repo_relative_urls'];
  foreach var pkg ( constraint_array['pkgs'] ) {
    var reference = NULL;
    var _release = NULL;
    var sp = NULL;
    var _cpu = NULL;
    var el_string = NULL;
    var rpm_spec_vers_cmp = NULL;
    var epoch = NULL;
    var allowmaj = NULL;
    var exists_check = NULL;
    var cves = NULL;
    if (!empty_or_null(pkg['reference'])) reference = pkg['reference'];
    if (!empty_or_null(pkg['release'])) _release = 'RHEL' + pkg['release'];
    if (!empty_or_null(pkg['sp'])) sp = pkg['sp'];
    if (!empty_or_null(pkg['cpu'])) _cpu = pkg['cpu'];
    if (!empty_or_null(pkg['el_string'])) el_string = pkg['el_string'];
    if (!empty_or_null(pkg['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = pkg['rpm_spec_vers_cmp'];
    if (!empty_or_null(pkg['epoch'])) epoch = pkg['epoch'];
    if (!empty_or_null(pkg['allowmaj'])) allowmaj = pkg['allowmaj'];
    if (!empty_or_null(pkg['exists_check'])) exists_check = pkg['exists_check'];
    if (!empty_or_null(pkg['cves'])) cves = pkg['cves'];
    if (reference &&
        _release &&
        rhel_decide_repo_relative_url_check(required_repo_url_list:repo_relative_urls) &&
        (applicable_repo_urls || (!exists_check || rpm_exists(release:_release, rpm:exists_check))) &&
        rpm_check(release:_release, sp:sp, cpu:_cpu, reference:reference, epoch:epoch, el_string:el_string, rpm_spec_vers_cmp:rpm_spec_vers_cmp, allowmaj:allowmaj, cves:cves)) flag++;
  }
}

if (flag)
{
  var extra = NULL;
  if (isnull(applicable_repo_urls) || !applicable_repo_urls) extra = rpm_report_get() + redhat_report_repo_caveat();
  else extra = rpm_report_get();
  security_report_v4(
      port       : 0,
      severity   : SECURITY_WARNING,
      extra      : extra
  );
  exit(0);
}
else
{
  var tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'ctdb / libsmbclient / libsmbclient-devel / libwbclient / etc');
}