RHEL 7 : libxml2 (RHSA-2020:1190)

##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Red Hat Security Advisory RHSA-2020:1190. The text
# itself is copyright (C) Red Hat, Inc.
##

include('compat.inc');

if (description)
{
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  script_version("1.11");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/06/04");

  script_cve_id(
    "CVE-2015-8035",
    "CVE-2016-5131",
    "CVE-2017-15412",
    "CVE-2017-18258",
    "CVE-2018-14404",
    "CVE-2018-14567"
  );
  script_bugtraq_id(
    77390,
    92053,
    102098,
    105198
  );
  script_xref(name:"RHSA", value:"2020:1190");
  script_xref(name:"IAVB", value:"2016-B-0083-S");
  script_xref(name:"IAVB", value:"2016-B-0113-S");
  script_xref(name:"IAVB", value:"2017-B-0169-S");

  script_name(english:"RHEL 7 : libxml2 (RHSA-2020:1190)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Red Hat host is missing one or more security updates for libxml2.");
  script_set_attribute(attribute:"description", value:
"The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as
referenced in the RHSA-2020:1190 advisory.

    The libxml2 library is a development toolbox providing the implementation of various XML standards.

    Security Fix(es):

    * libxml2: Use after free triggered by XPointer paths beginning with range-to (CVE-2016-5131)

    * libxml2: Use after free in xmlXPathCompOpEvalPositionalPredicate() function in xpath.c (CVE-2017-15412)

    * libxml2: DoS caused by incorrect error detection during XZ decompression (CVE-2015-8035)

    * libxml2: NULL pointer dereference in xmlXPathCompOpEval() function in xpath.c (CVE-2018-14404)

    * libxml2: Unrestricted memory usage in xz_head() function in xzlib.c (CVE-2017-18258)

    * libxml2: Infinite loop caused by incorrect error detection during LZMA decompression (CVE-2018-14567)

    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.

    Additional Changes:

    For detailed information on changes in this release, see the Red Hat Enterprise Linux 7.8 Release Notes
    linked from the References section.

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/2020/rhsa-2020_1190.json
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?4f885423");
  # https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/7.8_release_notes/index
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?afba0e17");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/updates/classification/#moderate");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/errata/RHSA-2020:1190");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1277146");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1358641");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1523128");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1566749");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1595985");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1619875");
  script_set_attribute(attribute:"solution", value:
"Update the RHEL libxml2 package based on the guidance in RHSA-2020:1190.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P");
  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:R/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2017-15412");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_cwe_id(252, 400, 476);
  script_set_attribute(attribute:"vendor_severity", value:"Moderate");

  script_set_attribute(attribute:"vuln_publication_date", value:"2015/11/02");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/03/31");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/04/01");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:7");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:libxml2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:libxml2-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:libxml2-python");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:libxml2-static");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2020-2024 and is owned by Tenable, Inc. or an Affiliate thereof.");

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

  exit(0);
}


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include('rhel.inc');

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var os_release = get_kb_item('Host/RedHat/release');
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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: '7')) audit(AUDIT_OS_NOT, 'Red Hat 7.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);

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      {'reference':'libxml2-devel-2.9.1-6.el7.4', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libxml2-python-2.9.1-6.el7.4', 'cpu':'ppc64', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libxml2-python-2.9.1-6.el7.4', 'cpu':'ppc64le', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libxml2-python-2.9.1-6.el7.4', 'cpu':'s390x', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libxml2-python-2.9.1-6.el7.4', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libxml2-static-2.9.1-6.el7.4', 'cpu':'i686', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libxml2-static-2.9.1-6.el7.4', 'cpu':'ppc', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libxml2-static-2.9.1-6.el7.4', 'cpu':'ppc64', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libxml2-static-2.9.1-6.el7.4', 'cpu':'ppc64le', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libxml2-static-2.9.1-6.el7.4', 'cpu':'s390', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libxml2-static-2.9.1-6.el7.4', 'cpu':'s390x', 'release':'7', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'libxml2-static-2.9.1-6.el7.4', 'cpu':'x86_64', 'release':'7', 'rpm_spec_vers_cmp':TRUE}
    ]
  }
];

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, 'libxml2 / libxml2-devel / libxml2-python / libxml2-static');
}