Debian dsa-6266 : 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 dsa-6266. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('compat.inc');

if (description)
{
  script_id(314609);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/05/14");

  script_cve_id("CVE-2026-27135");

  script_name(english:"Debian dsa-6266 : 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 12 / 13 host has packages installed that are affected by a vulnerability as referenced in the dsa-6266
advisory.

    - -------------------------------------------------------------------------
    Debian Security Advisory DSA-6266-1                   [email protected]
    https://www.debian.org/security/                                  Aron Xu
    May 14, 2026                          https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : nghttp2
    CVE ID         : CVE-2026-27135
    Debian Bug     : 1131369

    It was discovered that nghttp2, an implementation of the HTTP/2 protocol,
    could be crashed via an assertion failure. A remote attacker could exploit
    this to cause a DoS attack by sending a malformed frame immediately
    after triggering the termination path.

    For the oldstable distribution (bookworm), this problem has been fixed
    in version 1.52.0-1+deb12u3.

    For the stable distribution (trixie), this problem has been fixed in
    version 1.64.0-1.1+deb13u1.

    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 Security Advisories, how to apply
    these updates to your system and frequently asked questions can be
    found at: https://www.debian.org/security/

    Mailing list: [email protected]

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/bookworm/nghttp2");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/trixie/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:"2026/05/14");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/05/14");

  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:12.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:13.0");
  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:"^(12)\.[0-9]+|^(13)\.[0-9]+", string:debian_release)) audit(AUDIT_OS_NOT, 'Debian 12.0 / 13.0', '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': '12.0', 'prefix': 'libnghttp2-14', 'reference': '1.52.0-1+deb12u3'},
    {'release': '12.0', 'prefix': 'libnghttp2-dev', 'reference': '1.52.0-1+deb12u3'},
    {'release': '12.0', 'prefix': 'libnghttp2-doc', 'reference': '1.52.0-1+deb12u3'},
    {'release': '12.0', 'prefix': 'nghttp2', 'reference': '1.52.0-1+deb12u3'},
    {'release': '12.0', 'prefix': 'nghttp2-client', 'reference': '1.52.0-1+deb12u3'},
    {'release': '12.0', 'prefix': 'nghttp2-proxy', 'reference': '1.52.0-1+deb12u3'},
    {'release': '12.0', 'prefix': 'nghttp2-server', 'reference': '1.52.0-1+deb12u3'},
    {'release': '13.0', 'prefix': 'libnghttp2-14', 'reference': '1.64.0-1.1+deb13u1'},
    {'release': '13.0', 'prefix': 'libnghttp2-dev', 'reference': '1.64.0-1.1+deb13u1'},
    {'release': '13.0', 'prefix': 'libnghttp2-doc', 'reference': '1.64.0-1.1+deb13u1'},
    {'release': '13.0', 'prefix': 'nghttp2', 'reference': '1.64.0-1.1+deb13u1'},
    {'release': '13.0', 'prefix': 'nghttp2-client', 'reference': '1.64.0-1.1+deb13u1'},
    {'release': '13.0', 'prefix': 'nghttp2-proxy', 'reference': '1.64.0-1.1+deb13u1'},
    {'release': '13.0', 'prefix': 'nghttp2-server', 'reference': '1.64.0-1.1+deb13u1'}
];

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');
}