Amazon Linux 2 : ruby (ALASRUBY2.6-2023-004)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Amazon Linux 2 Security Advisory ALASRUBY2.6-2023-004.
##

include('compat.inc');

if (description)
{
  script_id(182033);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/09/28");

  script_cve_id("CVE-2021-31810", "CVE-2021-32066");

  script_name(english:"Amazon Linux 2 : ruby (ALASRUBY2.6-2023-004)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Amazon Linux 2 host is missing a security update.");
  script_set_attribute(attribute:"description", value:
"The version of ruby installed on the remote host is prior to 2.6.8-127. It is, therefore, affected by multiple
vulnerabilities as referenced in the ALAS2RUBY2.6-2023-004 advisory.

  - An issue was discovered in Ruby through 2.6.7, 2.7.x through 2.7.3, and 3.x through 3.0.1. A malicious FTP
    server can use the PASV response to trick Net::FTP into connecting back to a given IP address and port.
    This potentially makes curl extract information about services that are otherwise private and not
    disclosed (e.g., the attacker can conduct port scans and service banner extractions). (CVE-2021-31810)

  - An issue was discovered in Ruby through 2.6.7, 2.7.x through 2.7.3, and 3.x through 3.0.1. Net::IMAP does
    not raise an exception when StartTLS fails with an an unknown response, which might allow man-in-the-
    middle attackers to bypass the TLS protections by leveraging a network position between the client and the
    registry to block the StartTLS command, aka a StartTLS stripping attack. (CVE-2021-32066)

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://alas.aws.amazon.com/AL2/ALASRUBY2.6-2023-004.html");
  script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/cve/html/CVE-2021-31810.html");
  script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/cve/html/CVE-2021-32066.html");
  script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/faqs.html");
  script_set_attribute(attribute:"solution", value:
"Run 'yum update ruby' to update your system.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:P/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:H/PR:N/UI:N/S:U/C:H/I:H/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-2021-32066");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2021/07/13");
  script_set_attribute(attribute:"patch_publication_date", value:"2023/08/21");
  script_set_attribute(attribute:"plugin_publication_date", value:"2023/09/27");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:ruby");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:ruby-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:ruby-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:ruby-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:ruby-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:rubygem-bigdecimal");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:rubygem-bundler");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:rubygem-did_you_mean");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:rubygem-io-console");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:rubygem-irb");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:rubygem-json");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:rubygem-minitest");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:rubygem-net-telnet");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:rubygem-openssl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:rubygem-power_assert");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:rubygem-psych");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:rubygem-rake");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:rubygem-rdoc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:rubygem-test-unit");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:rubygem-xmlrpc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:rubygems");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:rubygems-devel");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:amazon:linux:2");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 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/AmazonLinux/release", "Host/AmazonLinux/rpm-list");

  exit(0);
}

include("rpm.inc");

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);

var alas_release = get_kb_item("Host/AmazonLinux/release");
if (isnull(alas_release) || !strlen(alas_release)) audit(AUDIT_OS_NOT, "Amazon Linux");
var os_ver = pregmatch(pattern: "^AL(A|\d+|-\d+)", string:alas_release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Amazon Linux");
os_ver = os_ver[1];
if (os_ver != "2")
{
  if (os_ver == 'A') os_ver = 'AMI';
  audit(AUDIT_OS_NOT, "Amazon Linux 2", "Amazon Linux " + os_ver);
}

if (!get_kb_item("Host/AmazonLinux/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);

var pkgs = [
    {'reference':'ruby-2.6.8-127.amzn2', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'ruby2.6'},
    {'reference':'ruby-2.6.8-127.amzn2', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'ruby2.6'},
    {'reference':'ruby-2.6.8-127.amzn2', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'ruby2.6'},
    {'reference':'ruby-debuginfo-2.6.8-127.amzn2', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'ruby2.6'},
    {'reference':'ruby-debuginfo-2.6.8-127.amzn2', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'ruby2.6'},
    {'reference':'ruby-debuginfo-2.6.8-127.amzn2', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'ruby2.6'},
    {'reference':'ruby-devel-2.6.8-127.amzn2', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'ruby2.6'},
    {'reference':'ruby-devel-2.6.8-127.amzn2', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'ruby2.6'},
    {'reference':'ruby-devel-2.6.8-127.amzn2', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'ruby2.6'},
    {'reference':'ruby-doc-2.6.8-127.amzn2', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'ruby2.6'},
    {'reference':'ruby-libs-2.6.8-127.amzn2', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'ruby2.6'},
    {'reference':'ruby-libs-2.6.8-127.amzn2', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'ruby2.6'},
    {'reference':'ruby-libs-2.6.8-127.amzn2', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'ruby2.6'},
    {'reference':'rubygem-bigdecimal-1.4.1-127.amzn2', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'ruby2.6'},
    {'reference':'rubygem-bigdecimal-1.4.1-127.amzn2', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'ruby2.6'},
    {'reference':'rubygem-bigdecimal-1.4.1-127.amzn2', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'ruby2.6'},
    {'reference':'rubygem-bundler-1.17.2-127.amzn2', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'ruby2.6'},
    {'reference':'rubygem-did_you_mean-1.3.0-127.amzn2', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'ruby2.6'},
    {'reference':'rubygem-io-console-0.4.7-127.amzn2', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'ruby2.6'},
    {'reference':'rubygem-io-console-0.4.7-127.amzn2', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'ruby2.6'},
    {'reference':'rubygem-io-console-0.4.7-127.amzn2', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'ruby2.6'},
    {'reference':'rubygem-irb-1.0.0-127.amzn2', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'ruby2.6'},
    {'reference':'rubygem-json-2.1.0-127.amzn2', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'ruby2.6'},
    {'reference':'rubygem-json-2.1.0-127.amzn2', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'ruby2.6'},
    {'reference':'rubygem-json-2.1.0-127.amzn2', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'ruby2.6'},
    {'reference':'rubygem-minitest-5.11.3-127.amzn2', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'ruby2.6'},
    {'reference':'rubygem-net-telnet-0.2.0-127.amzn2', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'ruby2.6'},
    {'reference':'rubygem-openssl-2.1.2-127.amzn2', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'ruby2.6'},
    {'reference':'rubygem-openssl-2.1.2-127.amzn2', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'ruby2.6'},
    {'reference':'rubygem-openssl-2.1.2-127.amzn2', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'ruby2.6'},
    {'reference':'rubygem-power_assert-1.1.3-127.amzn2', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'ruby2.6'},
    {'reference':'rubygem-psych-3.1.0-127.amzn2', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'ruby2.6'},
    {'reference':'rubygem-psych-3.1.0-127.amzn2', 'cpu':'i686', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'ruby2.6'},
    {'reference':'rubygem-psych-3.1.0-127.amzn2', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'ruby2.6'},
    {'reference':'rubygem-rake-12.3.3-127.amzn2', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'ruby2.6'},
    {'reference':'rubygem-rdoc-6.1.2.1-127.amzn2', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'ruby2.6'},
    {'reference':'rubygem-test-unit-3.2.9-127.amzn2', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'ruby2.6'},
    {'reference':'rubygem-xmlrpc-0.3.0-127.amzn2', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'ruby2.6'},
    {'reference':'rubygems-3.0.3.1-127.amzn2', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'ruby2.6'},
    {'reference':'rubygems-devel-3.0.3.1-127.amzn2', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE, 'exists_check':'ruby2.6'}
];

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 = 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_WARNING,
      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, "ruby / ruby-debuginfo / ruby-devel / etc");
}