Debian dla-4581 : libnghttp2-14 - 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-4581. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('compat.inc');

if (description)
{
  script_id(314499);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/05/13");

  script_cve_id("CVE-2026-27135");

  script_name(english:"Debian dla-4581 : libnghttp2-14 - security update");

  script_set_attribute(attribute:"synopsis", value:
"The remote Debian host is missing a security-related update.");
  script_set_attribute(attribute:"description", value:
"The remote Debian 11 host has packages installed that are affected by a vulnerability as referenced in the dla-4581
advisory.

    -------------------------------------------------------------------------
    Debian LTS Advisory DLA-4581-1                [email protected]
    https://www.debian.org/lts/security/                       Lukas Mrdian
    May 13, 2026                                  https://wiki.debian.org/LTS
    -------------------------------------------------------------------------

    Package        : nghttp2
    Version        : 1.43.0-1+deb11u3
    CVE ID         : CVE-2026-27135
    Debian Bug     : 1131369

    A vulnerabilitie was discovered in nghttp2, a server, proxy and client
    implementing HTTP/2.

    CVE-2026-27135

        Fix missing iframe->state validations to avoid assertion failure. As
        backported from upstream v1.68.1 (commit 5c7df8f), incl. upstream test case
        from commit c619c7be0737ac78051b1cacf4b1ce5467eb838d.

    For Debian 11 bullseye, this problem has been fixed in version
    1.43.0-1+deb11u3.

    We recommend that you upgrade your nghttp2 packages.

    For the detailed security status of nghttp2 please refer to
    its security tracker page at:
    https://security-tracker.debian.org/tracker/nghttp2

    Further information about Debian LTS security advisories, how to apply
    these updates to your system and frequently asked questions can be
    found at: https://wiki.debian.org/LTS
    Attachment:
    signature.asc
    Description: PGP signature

Tenable has extracted the preceding description block directly from the Debian security advisory.

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://security-tracker.debian.org/tracker/source-package/nghttp2");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-27135");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/bullseye/nghttp2");
  script_set_attribute(attribute:"solution", value:
"Upgrade the libnghttp2-14 packages.");
  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:U/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-2026-27135");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/03/18");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/05/13");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/05/13");

  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:11.0");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2026 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:"^(11)\.[0-9]+", string:debian_release)) audit(AUDIT_OS_NOT, 'Debian 11.0', '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': '11.0', 'prefix': 'libnghttp2-14', 'reference': '1.43.0-1+deb11u3'},
    {'release': '11.0', 'prefix': 'libnghttp2-dev', 'reference': '1.43.0-1+deb11u3'},
    {'release': '11.0', 'prefix': 'libnghttp2-doc', 'reference': '1.43.0-1+deb11u3'},
    {'release': '11.0', 'prefix': 'nghttp2', 'reference': '1.43.0-1+deb11u3'},
    {'release': '11.0', 'prefix': 'nghttp2-client', 'reference': '1.43.0-1+deb11u3'},
    {'release': '11.0', 'prefix': 'nghttp2-proxy', 'reference': '1.43.0-1+deb11u3'},
    {'release': '11.0', 'prefix': 'nghttp2-server', 'reference': '1.43.0-1+deb11u3'}
];

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_HOLE,
    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');
}