RHEL 6 : samba (RHSA-2016:0015)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Red Hat Security Advisory RHSA-2016:0015. The text 
# itself is copyright (C) Red Hat, Inc.
#

include('compat.inc');

if (description)
{
  script_id(90077);
  script_version("2.15");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/06/03");

  script_cve_id(
    "CVE-2015-5252",
    "CVE-2015-5296",
    "CVE-2015-5299",
    "CVE-2015-5330",
    "CVE-2015-7540"
  );
  script_xref(name:"RHSA", value:"2016:0015");

  script_name(english:"RHEL 6 : samba (RHSA-2016:0015)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Red Hat host is missing one or more security updates for samba.");
  script_set_attribute(attribute:"description", value:
"The remote Redhat Enterprise Linux 6 host has packages installed that are affected by multiple vulnerabilities as
referenced in the RHSA-2016:0015 advisory.

    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)

    Multiple buffer over-read flaws were found in the way Samba handled
    malformed inputs in certain encodings. An authenticated, remote attacker
    could possibly use these flaws to disclose portions of the server memory.
    (CVE-2015-5330)

    A denial of service flaw was found in the LDAP server provided by the AD DC
    in the Samba process daemon. A remote attacker could exploit this flaw by
    sending a specially crafted packet, which could cause the server to consume
    an excessive amount of memory and crash. (CVE-2015-7540)

    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 flaws, and Douglas Bagnall as the original
    reporter of CVE-2015-5330.

    All samba users are advised to upgrade to these updated packages, which
    contain backported patches to correct these issues. After installing this
    update, the smb service will be restarted automatically.

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.");
  # https://access.redhat.com/security/data/csaf/v2/advisories/2016/rhsa-2016_0015.json
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?b5ebafdf");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/errata/RHSA-2016:0015");
  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=1276126");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1281326");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1288451");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1290288");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1290292");
  script_set_attribute(attribute:"solution", value:
"Update the RHEL samba package based on the guidance in RHSA-2016:0015.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:POC/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:N/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2015-5330");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_cwe_id(135, 345, 41, 770, 862);
  script_set_attribute(attribute:"vendor_severity", value:"Moderate");

  script_set_attribute(attribute:"vuln_publication_date", value:"2015/12/29");
  script_set_attribute(attribute:"patch_publication_date", value:"2016/01/08");
  script_set_attribute(attribute:"plugin_publication_date", value:"2016/03/22");

  script_set_attribute(attribute:"plugin_type", value:"local");
  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-common");
  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-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-test");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:samba-test-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:samba-test-libs");
  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) 2016-2024 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':'libsmbclient-4.1.17-16.el6rhs', 'cpu':'x86_64', 'release':'6', 'el_string':'el6rhs', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'glusterfs'},
      {'reference':'libsmbclient-devel-4.1.17-16.el6rhs', 'cpu':'x86_64', 'release':'6', 'el_string':'el6rhs', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'glusterfs'},
      {'reference':'libwbclient-4.1.17-16.el6rhs', 'cpu':'x86_64', 'release':'6', 'el_string':'el6rhs', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'glusterfs'},
      {'reference':'libwbclient-devel-4.1.17-16.el6rhs', 'cpu':'x86_64', 'release':'6', 'el_string':'el6rhs', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'glusterfs'},
      {'reference':'samba-4.1.17-16.el6rhs', 'cpu':'x86_64', 'release':'6', 'el_string':'el6rhs', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'glusterfs'},
      {'reference':'samba-client-4.1.17-16.el6rhs', 'cpu':'x86_64', 'release':'6', 'el_string':'el6rhs', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'glusterfs'},
      {'reference':'samba-common-4.1.17-16.el6rhs', 'cpu':'x86_64', 'release':'6', 'el_string':'el6rhs', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'glusterfs'},
      {'reference':'samba-dc-4.1.17-16.el6rhs', 'cpu':'x86_64', 'release':'6', 'el_string':'el6rhs', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'glusterfs'},
      {'reference':'samba-dc-libs-4.1.17-16.el6rhs', 'cpu':'x86_64', 'release':'6', 'el_string':'el6rhs', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'glusterfs'},
      {'reference':'samba-devel-4.1.17-16.el6rhs', 'cpu':'x86_64', 'release':'6', 'el_string':'el6rhs', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'glusterfs'},
      {'reference':'samba-libs-4.1.17-16.el6rhs', 'cpu':'x86_64', 'release':'6', 'el_string':'el6rhs', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'glusterfs'},
      {'reference':'samba-pidl-4.1.17-16.el6rhs', 'release':'6', 'el_string':'el6rhs', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'glusterfs'},
      {'reference':'samba-python-4.1.17-16.el6rhs', 'cpu':'x86_64', 'release':'6', 'el_string':'el6rhs', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'glusterfs'},
      {'reference':'samba-test-4.1.17-16.el6rhs', 'cpu':'x86_64', 'release':'6', 'el_string':'el6rhs', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'glusterfs'},
      {'reference':'samba-test-devel-4.1.17-16.el6rhs', 'cpu':'x86_64', 'release':'6', 'el_string':'el6rhs', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'glusterfs'},
      {'reference':'samba-test-libs-4.1.17-16.el6rhs', 'cpu':'x86_64', 'release':'6', 'el_string':'el6rhs', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'glusterfs'},
      {'reference':'samba-vfs-glusterfs-4.1.17-16.el6rhs', 'cpu':'x86_64', 'release':'6', 'el_string':'el6rhs', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'glusterfs'},
      {'reference':'samba-winbind-4.1.17-16.el6rhs', 'cpu':'x86_64', 'release':'6', 'el_string':'el6rhs', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'glusterfs'},
      {'reference':'samba-winbind-clients-4.1.17-16.el6rhs', 'cpu':'x86_64', 'release':'6', 'el_string':'el6rhs', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'glusterfs'},
      {'reference':'samba-winbind-krb5-locator-4.1.17-16.el6rhs', 'cpu':'x86_64', 'release':'6', 'el_string':'el6rhs', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'glusterfs'},
      {'reference':'samba-winbind-modules-4.1.17-16.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, 'libsmbclient / libsmbclient-devel / libwbclient / libwbclient-devel / etc');
}