Debian DLA-3621-1 : nghttp2 - LTS security update

#%NASL_MIN_LEVEL 80900
#
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Debian Security Advisory dla-3621. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('compat.inc');

if (description)
{
  script_id(183195);
  script_version("1.6");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/02/23");

  script_cve_id("CVE-2020-11080", "CVE-2023-44487");
  script_xref(name:"CISA-KNOWN-EXPLOITED", value:"2023/10/31");
  script_xref(name:"CEA-ID", value:"CEA-2021-0004");
  script_xref(name:"CEA-ID", value:"CEA-2024-0004");
  script_xref(name:"IAVB", value:"2023-B-0083-S");

  script_name(english:"Debian DLA-3621-1 : nghttp2 - LTS security update");

  script_set_attribute(attribute:"synopsis", value:
"The remote Debian host is missing one or more security-related updates.");
  script_set_attribute(attribute:"description", value:
"The remote Debian 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the
dla-3621 advisory.

  - In nghttp2 before version 1.41.0, the overly large HTTP/2 SETTINGS frame payload causes denial of service.
    The proof of concept attack involves a malicious client constructing a SETTINGS frame with a length of
    14,400 bytes (2400 individual settings entries) over and over again. The attack causes the CPU to spike at
    100%. nghttp2 v1.41.0 fixes this vulnerability. There is a workaround to this vulnerability. Implement
    nghttp2_on_frame_recv_callback callback, and if received frame is SETTINGS frame and the number of
    settings entries are large (e.g., > 32), then drop the connection. (CVE-2020-11080)

  - The HTTP/2 protocol allows a denial of service (server resource consumption) because request cancellation
    can reset many streams quickly, as exploited in the wild in August through October 2023. (CVE-2023-44487)

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://bugs.debian.org/cgi-bin/bugreport.cgi?bug=962145");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/source-package/nghttp2");
  script_set_attribute(attribute:"see_also", value:"https://www.debian.org/lts/security/2023/dla-3621");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2020-11080");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2023-44487");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/buster/nghttp2");
  script_set_attribute(attribute:"solution", value:
"Upgrade the nghttp2 packages.

For Debian 10 buster, these problems have been fixed in version 1.36.0-2+deb10u2.");
  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:F/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:F/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2020-11080");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2023-44487");

  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:"2020/06/03");
  script_set_attribute(attribute:"patch_publication_date", value:"2023/10/16");
  script_set_attribute(attribute:"plugin_publication_date", value:"2023/10/16");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libnghttp2-14");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libnghttp2-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libnghttp2-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:nghttp2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:nghttp2-client");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:nghttp2-proxy");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:nghttp2-server");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:10.0");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2023-2024 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/Debian/release", "Host/Debian/dpkg-l");

  exit(0);
}

include('debian_package.inc');

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/Debian/dpkg-l")) audit(AUDIT_PACKAGE_LIST_MISSING);

var debian_release = get_kb_item('Host/Debian/release');
if ( isnull(debian_release) ) audit(AUDIT_OS_NOT, 'Debian');
debian_release = chomp(debian_release);
if (! preg(pattern:"^(10)\.[0-9]+", string:debian_release)) audit(AUDIT_OS_NOT, 'Debian 10.0', 'Debian ' + debian_release);
var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Debian', cpu);

var pkgs = [
    {'release': '10.0', 'prefix': 'libnghttp2-14', 'reference': '1.36.0-2+deb10u2'},
    {'release': '10.0', 'prefix': 'libnghttp2-dev', 'reference': '1.36.0-2+deb10u2'},
    {'release': '10.0', 'prefix': 'libnghttp2-doc', 'reference': '1.36.0-2+deb10u2'},
    {'release': '10.0', 'prefix': 'nghttp2', 'reference': '1.36.0-2+deb10u2'},
    {'release': '10.0', 'prefix': 'nghttp2-client', 'reference': '1.36.0-2+deb10u2'},
    {'release': '10.0', 'prefix': 'nghttp2-proxy', 'reference': '1.36.0-2+deb10u2'},
    {'release': '10.0', 'prefix': 'nghttp2-server', 'reference': '1.36.0-2+deb10u2'}
];

var flag = 0;
foreach package_array ( pkgs ) {
  var _release = NULL;
  var prefix = NULL;
  var reference = NULL;
  if (!empty_or_null(package_array['release'])) _release = package_array['release'];
  if (!empty_or_null(package_array['prefix'])) prefix = package_array['prefix'];
  if (!empty_or_null(package_array['reference'])) reference = package_array['reference'];
  if (_release && prefix && reference) {
    if (deb_check(release:_release, prefix:prefix, reference:reference)) flag++;
  }
}

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_WARNING,
    extra      : deb_report_get()
  );
  exit(0);
}
else
{
  var tested = deb_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'libnghttp2-14 / libnghttp2-dev / libnghttp2-doc / nghttp2 / etc');
}