AlmaLinux 9 : skopeo (ALSA-2022:7955)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The package checks in this plugin were extracted from
# AlmaLinux Security Advisory ALSA-2022:7955.
##

include('compat.inc');

if (description)
{
  script_id(167985);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/10/03");

  script_cve_id("CVE-2021-20291", "CVE-2021-33198");
  script_xref(name:"ALSA", value:"2022:7955");

  script_name(english:"AlmaLinux 9 : skopeo (ALSA-2022:7955)");

  script_set_attribute(attribute:"synopsis", value:
"The remote AlmaLinux host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The remote AlmaLinux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the
ALSA-2022:7955 advisory.

  - A deadlock vulnerability was found in 'github.com/containers/storage' in versions before 1.28.1. When a
    container image is processed, each layer is unpacked using `tar`. If one of those layers is not a valid
    `tar` archive this causes an error leading to an unexpected situation where the code indefinitely waits
    for the tar unpacked stream, which never finishes. An attacker could use this vulnerability to craft a
    malicious image, which when downloaded and stored by an application using containers/storage, would then
    cause a deadlock leading to a Denial of Service (DoS). (CVE-2021-20291)

  - In Go before 1.15.13 and 1.16.x before 1.16.5, there can be a panic for a large exponent to the
    math/big.Rat SetString or UnmarshalText method. (CVE-2021-33198)

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://errata.almalinux.org/9/ALSA-2022-7955.html");
  script_set_attribute(attribute:"solution", value:
"Update the affected skopeo and / or skopeo-tests packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:N/I:N/A:C");
  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:N/I:N/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-2021-20291");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2021-33198");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_cwe_id(400, 667);

  script_set_attribute(attribute:"vuln_publication_date", value:"2021/04/01");
  script_set_attribute(attribute:"patch_publication_date", value:"2022/11/15");
  script_set_attribute(attribute:"plugin_publication_date", value:"2022/11/19");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:skopeo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:alma:linux:skopeo-tests");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:9");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:alma:linux:9::appstream");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Alma Linux Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2022-2023 and is owned by Tenable, Inc. or an Affiliate thereof.");

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

  exit(0);
}


include('rpm.inc');

if (!get_kb_item('Host/local_checks_enabled')) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var os_release = get_kb_item('Host/AlmaLinux/release');
if (isnull(os_release) || 'AlmaLinux' >!< os_release) audit(AUDIT_OS_NOT, 'AlmaLinux');
var os_ver = pregmatch(pattern: "AlmaLinux release ([0-9]+(\.[0-9]+)?)", string:os_release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, 'AlmaLinux');
os_ver = os_ver[1];
if (! preg(pattern:"^9([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, 'AlmaLinux 9.x', 'AlmaLinux ' + os_ver);

if (!get_kb_item('Host/AlmaLinux/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) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'AlmaLinux', cpu);

var pkgs = [
    {'reference':'skopeo-1.9.2-1.el9', 'cpu':'aarch64', 'release':'9', 'rpm_spec_vers_cmp':TRUE, 'epoch':'2'},
    {'reference':'skopeo-1.9.2-1.el9', 'cpu':'x86_64', 'release':'9', 'rpm_spec_vers_cmp':TRUE, 'epoch':'2'},
    {'reference':'skopeo-tests-1.9.2-1.el9', 'cpu':'aarch64', 'release':'9', 'rpm_spec_vers_cmp':TRUE, 'epoch':'2'},
    {'reference':'skopeo-tests-1.9.2-1.el9', 'cpu':'x86_64', 'release':'9', 'rpm_spec_vers_cmp':TRUE, 'epoch':'2'}
];

var flag = 0;
foreach var package_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;
  if (!empty_or_null(package_array['reference'])) reference = package_array['reference'];
  if (!empty_or_null(package_array['release'])) _release = 'Alma-' + 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 (reference && _release && (!exists_check || rpm_exists(release:_release, rpm:exists_check))) {
    if (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)) flag++;
  }
}

if (flag)
{
  security_report_v4(
      port       : 0,
      severity   : SECURITY_HOLE,
      extra      : rpm_report_get()
  );
  exit(0);
}
else
{
  var tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'skopeo / skopeo-tests');
}