RHEL 4 : mod_auth_kerb (RHSA-2006:0746)

#%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-2006:0746. The text 
# itself is copyright (C) Red Hat, Inc.
#

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

if (description)
{
  script_id(23797);
  script_version("1.25");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/03/20");

  script_cve_id("CVE-2006-5989");
  script_xref(name:"RHSA", value:"2006:0746");

  script_name(english:"RHEL 4 : mod_auth_kerb (RHSA-2006:0746)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Red Hat host is missing a security update for mod_auth_kerb.");
  script_set_attribute(attribute:"description", value:
"The remote Redhat Enterprise Linux 4 host has a package installed that is affected by a vulnerability as referenced in
the RHSA-2006:0746 advisory.

    mod_auth_kerb is module for the Apache HTTP Server designed to
    provide Kerberos authentication over HTTP.

    An off by one flaw was found in the way mod_auth_kerb handles certain
    Kerberos authentication messages. A remote client could send a specially
    crafted authentication request which could crash an httpd child process
    (CVE-2006-5989).

    A bug in the handling of multiple realms configured using the
    KrbAuthRealms directive has also been fixed.

    All users of mod_auth_kerb should upgrade to these updated packages, which
    contain backported patches that resolve these issues.

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/2006/rhsa-2006_0746.json
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?2573cddb");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/updates/classification/#low");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=216482");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/errata/RHSA-2006:0746");
  script_set_attribute(attribute:"solution", value:
"Update the RHEL mod_auth_kerb package based on the guidance in RHSA-2006:0746.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P");
  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: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-2006-5989");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_set_attribute(attribute:"vendor_severity", value:"Low");

  script_set_attribute(attribute:"vuln_publication_date", value:"2006/11/20");
  script_set_attribute(attribute:"patch_publication_date", value:"2006/12/06");
  script_set_attribute(attribute:"plugin_publication_date", value:"2006/12/11");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:mod_auth_kerb");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:4");
  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) 2006-2025 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: '4')) audit(AUDIT_OS_NOT, 'Red Hat 4.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/as/4/4AS/i386/os',
      'content/dist/rhel/as/4/4AS/i386/source/SRPMS',
      'content/dist/rhel/as/4/4AS/x86_64/os',
      'content/dist/rhel/as/4/4AS/x86_64/source/SRPMS',
      'content/dist/rhel/desktop/4/4Desktop/i386/os',
      'content/dist/rhel/desktop/4/4Desktop/i386/source/SRPMS',
      'content/dist/rhel/desktop/4/4Desktop/x86_64/os',
      'content/dist/rhel/desktop/4/4Desktop/x86_64/source/SRPMS',
      'content/dist/rhel/es/4/4ES/i386/os',
      'content/dist/rhel/es/4/4ES/i386/source/SRPMS',
      'content/dist/rhel/es/4/4ES/x86_64/os',
      'content/dist/rhel/es/4/4ES/x86_64/source/SRPMS',
      'content/dist/rhel/power/4/4AS/ppc/os',
      'content/dist/rhel/power/4/4AS/ppc/source/SRPMS',
      'content/dist/rhel/system-z/4/4AS/s390/os',
      'content/dist/rhel/system-z/4/4AS/s390/source/SRPMS',
      'content/dist/rhel/system-z/4/4AS/s390x/os',
      'content/dist/rhel/system-z/4/4AS/s390x/source/SRPMS',
      'content/dist/rhel/ws/4/4WS/i386/os',
      'content/dist/rhel/ws/4/4WS/i386/source/SRPMS',
      'content/dist/rhel/ws/4/4WS/x86_64/os',
      'content/dist/rhel/ws/4/4WS/x86_64/source/SRPMS'
    ],
    'pkgs': [
      {'reference':'mod_auth_kerb-5.0-1.3', 'cpu':'i386', 'release':'4', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'mod_auth_kerb-5.0-1.3', 'cpu':'ppc', 'release':'4', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'mod_auth_kerb-5.0-1.3', 'cpu':'s390', 'release':'4', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'mod_auth_kerb-5.0-1.3', 'cpu':'s390x', 'release':'4', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'mod_auth_kerb-5.0-1.3', 'cpu':'x86_64', 'release':'4', '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, 'mod_auth_kerb');
}