Amazon Linux 2 : libuv (ALAS-2021-1581)

##
# (C) Tenable Network Security, Inc.
#                                  
# The descriptive text and package checks in this plugin were
# extracted from Amazon Linux 2 Security Advisory ALAS-2021-1581.
##

include('compat.inc');

if (description)
{
  script_id(144797);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/07");

  script_cve_id("CVE-2020-8201", "CVE-2020-8251");
  script_xref(name:"ALAS", value:"2021-1581");

  script_name(english:"Amazon Linux 2 : libuv (ALAS-2021-1581)");
  script_summary(english:"Checks rpm output for the updated packages");

  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 tested product installed on the remote host is prior to tested version. It is, therefore, affected by
multiple vulnerabilities as referenced in the ALAS2-2021-1581 advisory.

  - Node.js < 12.18.4 and < 14.11 can be exploited to perform HTTP desync attacks and deliver malicious
    payloads to unsuspecting users. The payloads can be crafted by an attacker to hijack user sessions, poison
    cookies, perform clickjacking, and a multitude of other attacks depending on the architecture of the
    underlying system. The attack was possible due to a bug in processing of carrier-return symbols in the
    HTTP header names. (CVE-2020-8201)

  - Node.js < 14.11.0 is vulnerable to HTTP denial of service (DoS) attacks based on delayed requests
    submission which can make the server unable to accept new connections. (CVE-2020-8251)

Note that Nessus has not tested for this issue 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/ALAS-2021-1581.html");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/CVE-2020-8201");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/CVE-2020-8251");
  script_set_attribute(attribute:"solution", value:
"Run 'yum update libuv' 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:U/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:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2020-8201");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");

  script_set_attribute(attribute:"vuln_publication_date", value:"2020/09/15");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/01/05");
  script_set_attribute(attribute:"plugin_publication_date", value:"2021/01/07");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:libuv");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:libuv-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:libuv-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:libuv-static");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:amazon:linux:2");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2021 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("audit.inc");
include("global_settings.inc");
include("rpm.inc");

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

release = get_kb_item("Host/AmazonLinux/release");
if (isnull(release) || !strlen(release)) audit(AUDIT_OS_NOT, "Amazon Linux");
os_ver = pregmatch(pattern: "^AL(A|\d)", string: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);

pkgs = [
    {'reference':'libuv-1.39.0-1.amzn2', 'cpu':'aarch64', 'release':'AL2'},
    {'reference':'libuv-1.39.0-1.amzn2', 'cpu':'i686', 'release':'AL2'},
    {'reference':'libuv-1.39.0-1.amzn2', 'cpu':'x86_64', 'release':'AL2'},
    {'reference':'libuv-debuginfo-1.39.0-1.amzn2', 'cpu':'aarch64', 'release':'AL2'},
    {'reference':'libuv-debuginfo-1.39.0-1.amzn2', 'cpu':'i686', 'release':'AL2'},
    {'reference':'libuv-debuginfo-1.39.0-1.amzn2', 'cpu':'x86_64', 'release':'AL2'},
    {'reference':'libuv-devel-1.39.0-1.amzn2', 'cpu':'aarch64', 'release':'AL2'},
    {'reference':'libuv-devel-1.39.0-1.amzn2', 'cpu':'i686', 'release':'AL2'},
    {'reference':'libuv-devel-1.39.0-1.amzn2', 'cpu':'x86_64', 'release':'AL2'},
    {'reference':'libuv-static-1.39.0-1.amzn2', 'cpu':'aarch64', 'release':'AL2'},
    {'reference':'libuv-static-1.39.0-1.amzn2', 'cpu':'i686', 'release':'AL2'},
    {'reference':'libuv-static-1.39.0-1.amzn2', 'cpu':'x86_64', 'release':'AL2'}
];

flag = 0;
foreach package_array ( pkgs ) {
  reference = NULL;
  release = NULL;
  cpu = NULL;
  el_string = NULL;
  rpm_spec_vers_cmp = NULL;
  allowmaj = 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['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['allowmaj'])) allowmaj = package_array['allowmaj'];
  if (reference && release) {
    if (rpm_check(release:release, cpu:cpu, reference:reference, 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
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "libuv / libuv-debuginfo / libuv-devel / etc");
}