RHEL 8 : squid:4 (RHSA-2024:2777)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Red Hat Security Advisory RHSA-2024:2777. The text
# itself is copyright (C) Red Hat, Inc.
##

include('compat.inc');

if (description)
{
  script_id(195195);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/05/10");

  script_cve_id("CVE-2024-25111", "CVE-2024-25617");
  script_xref(name:"RHSA", value:"2024:2777");

  script_name(english:"RHEL 8 : squid:4 (RHSA-2024:2777)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Red Hat host is missing one or more security updates for squid:4.");
  script_set_attribute(attribute:"description", value:
"The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as
referenced in the RHSA-2024:2777 advisory.

  - Squid is a web proxy cache. Starting in version 3.5.27 and prior to version 6.8, Squid may be vulnerable
    to a Denial of Service attack against HTTP Chunked decoder due to an uncontrolled recursion bug. This
    problem allows a remote attacker to cause Denial of Service when sending a crafted, chunked, encoded HTTP
    Message. This bug is fixed in Squid version 6.8. In addition, patches addressing this problem for the
    stable releases can be found in Squid's patch archives. There is no workaround for this issue.
    (CVE-2024-25111)

  - Squid is an open source caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. Due to a Collapse
    of Data into Unsafe Value bug ,Squid may be vulnerable to a Denial of Service attack against HTTP header
    parsing. This problem allows a remote client or a remote server to perform Denial of Service when sending
    oversized headers in HTTP messages. In versions of Squid prior to 6.5 this can be achieved if the
    request_header_max_size or reply_header_max_size settings are unchanged from the default. In Squid version
    6.5 and later, the default setting of these parameters is safe. Squid will emit a critical warning in
    cache.log if the administrator is setting these parameters to unsafe values. Squid will not at this time
    prevent these settings from being changed to unsafe values. Users are advised to upgrade to version 6.5.
    There are no known workarounds for this vulnerability. This issue is also tracked as SQUID-2024:2
    (CVE-2024-25617)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/errata/RHSA-2024:2777");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/CVE-2024-25111");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/CVE-2024-25617");
  script_set_attribute(attribute:"solution", value:
"Update the RHEL squid:4 package based on the guidance in RHSA-2024:2777.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/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:N/UI:N/S:C/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-2024-25617");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2024-25111");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_cwe_id(182, 400, 674);
  script_set_attribute(attribute:"vendor_severity", value:"Important");

  script_set_attribute(attribute:"vuln_publication_date", value:"2023/12/06");
  script_set_attribute(attribute:"patch_publication_date", value:"2024/05/09");
  script_set_attribute(attribute:"plugin_publication_date", value:"2024/05/09");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:rhel_aus:8.2");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:rhel_e4s:8.2");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:rhel_tus:8.2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:libecap");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:libecap-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:squid");
  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) 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);
}


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: 'eq', os_version: os_ver, rhel_version: '8.2')) audit(AUDIT_OS_NOT, 'Red Hat 8.2', '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 appstreams = {
  'squid:4': [
    {
      'repo_relative_urls': [
        'content/aus/rhel8/8.2/x86_64/appstream/debug',
        'content/aus/rhel8/8.2/x86_64/appstream/os',
        'content/aus/rhel8/8.2/x86_64/appstream/source/SRPMS',
        'content/aus/rhel8/8.2/x86_64/baseos/debug',
        'content/aus/rhel8/8.2/x86_64/baseos/os',
        'content/aus/rhel8/8.2/x86_64/baseos/source/SRPMS',
        'content/e4s/rhel8/8.2/x86_64/appstream/debug',
        'content/e4s/rhel8/8.2/x86_64/appstream/os',
        'content/e4s/rhel8/8.2/x86_64/appstream/source/SRPMS',
        'content/e4s/rhel8/8.2/x86_64/baseos/debug',
        'content/e4s/rhel8/8.2/x86_64/baseos/os',
        'content/e4s/rhel8/8.2/x86_64/baseos/source/SRPMS',
        'content/e4s/rhel8/8.2/x86_64/highavailability/debug',
        'content/e4s/rhel8/8.2/x86_64/highavailability/os',
        'content/e4s/rhel8/8.2/x86_64/highavailability/source/SRPMS',
        'content/e4s/rhel8/8.2/x86_64/sap-solutions/debug',
        'content/e4s/rhel8/8.2/x86_64/sap-solutions/os',
        'content/e4s/rhel8/8.2/x86_64/sap-solutions/source/SRPMS',
        'content/e4s/rhel8/8.2/x86_64/sap/debug',
        'content/e4s/rhel8/8.2/x86_64/sap/os',
        'content/e4s/rhel8/8.2/x86_64/sap/source/SRPMS',
        'content/tus/rhel8/8.2/x86_64/appstream/debug',
        'content/tus/rhel8/8.2/x86_64/appstream/os',
        'content/tus/rhel8/8.2/x86_64/appstream/source/SRPMS',
        'content/tus/rhel8/8.2/x86_64/baseos/debug',
        'content/tus/rhel8/8.2/x86_64/baseos/os',
        'content/tus/rhel8/8.2/x86_64/baseos/source/SRPMS',
        'content/tus/rhel8/8.2/x86_64/highavailability/debug',
        'content/tus/rhel8/8.2/x86_64/highavailability/os',
        'content/tus/rhel8/8.2/x86_64/highavailability/source/SRPMS',
        'content/tus/rhel8/8.2/x86_64/nfv/debug',
        'content/tus/rhel8/8.2/x86_64/nfv/os',
        'content/tus/rhel8/8.2/x86_64/nfv/source/SRPMS',
        'content/tus/rhel8/8.2/x86_64/rt/debug',
        'content/tus/rhel8/8.2/x86_64/rt/os',
        'content/tus/rhel8/8.2/x86_64/rt/source/SRPMS'
      ],
      'pkgs': [
        {'reference':'libecap-1.0.1-2.module+el8.1.0+4044+36416a77', 'sp':'2', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
        {'reference':'libecap-devel-1.0.1-2.module+el8.1.0+4044+36416a77', 'sp':'2', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE},
        {'reference':'squid-4.4-8.module+el8.2.0+21527+aa63d5ff.9', 'sp':'2', 'cpu':'x86_64', 'release':'8', 'rpm_spec_vers_cmp':TRUE, 'epoch':'7'}
      ]
    }
  ]
};

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

var module_ver = get_kb_item('Host/RedHat/appstream/squid');
if (isnull(module_ver)) audit(AUDIT_PACKAGE_NOT_INSTALLED, 'Module squid:4');
if ('4' >!< module_ver) audit(AUDIT_PACKAGE_NOT_AFFECTED, 'Module squid:' + module_ver);

var flag = 0;
var appstreams_found = 0;
foreach var module (keys(appstreams)) {
  var appstream = NULL;
  var appstream_name = NULL;
  var appstream_version = NULL;
  var appstream_split = split(module, sep:':', keep:FALSE);
  if (!empty_or_null(appstream_split)) {
    appstream_name = appstream_split[0];
    appstream_version = appstream_split[1];
    if (!empty_or_null(appstream_name)) appstream = get_one_kb_item('Host/RedHat/appstream/' + appstream_name);
  }
  if (!empty_or_null(appstream) && appstream_version == appstream || appstream_name == 'all') {
    appstreams_found++;
    foreach var module_array ( appstreams[module] ) {
      var repo_relative_urls = NULL;
      if (!empty_or_null(module_array['repo_relative_urls'])) repo_relative_urls = module_array['repo_relative_urls'];
      foreach var package_array ( module_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(package_array['reference'])) reference = package_array['reference'];
        if (!empty_or_null(package_array['release'])) _release = 'RHEL' + package_array['release'];
        if (!empty_or_null(package_array['sp'])) sp = package_array['sp'];
        if (!empty_or_null(package_array['cpu'])) _cpu = package_array['cpu'];
        if (!empty_or_null(package_array['el_string'])) el_string = package_array['el_string'];
        if (!empty_or_null(package_array['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = package_array['rpm_spec_vers_cmp'];
        if (!empty_or_null(package_array['epoch'])) epoch = package_array['epoch'];
        if (!empty_or_null(package_array['allowmaj'])) allowmaj = package_array['allowmaj'];
        if (!empty_or_null(package_array['exists_check'])) exists_check = package_array['exists_check'];
        if (!empty_or_null(package_array['cves'])) cves = package_array['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 (!appstreams_found) audit(AUDIT_PACKAGE_NOT_INSTALLED, 'Module squid:4');

if (flag)
{
  var subscription_caveat = '\n' +
    'NOTE: This vulnerability check contains fixes that apply to\n' +
    'packages only available in the Red Hat Enterprise Linux\n' +
    'Advanced Update Support, Telco Extended Update Support or Update Services for SAP Solutions repositories.\n' +
    'Access to these repositories requires a paid RHEL subscription.\n';
  var extra = NULL;
  if (isnull(applicable_repo_urls) || !applicable_repo_urls) extra = subscription_caveat + rpm_report_get() + redhat_report_repo_caveat();
  else extra = subscription_caveat + rpm_report_get();
  security_report_v4(
      port       : 0,
      severity   : SECURITY_HOLE,
      extra      : extra
  );
  exit(0);
}
else
{
  var tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'libecap / libecap-devel / squid');
}