Debian dla-4463 : pypy-pyasn1 - 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-4463. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('compat.inc');

if (description)
{
  script_id(297504);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/02/01");

  script_cve_id("CVE-2026-23490");

  script_name(english:"Debian dla-4463 : pypy-pyasn1 - 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-4463
advisory.

    - -----------------------------------------------------------------------
    Debian LTS Advisory DLA-4463-1              [email protected]
    https://www.debian.org/lts/security/                      Utkarsh Gupta
    February 01, 2026                           https://wiki.debian.org/LTS
    - -----------------------------------------------------------------------

    Package        : pyasn1
    Version        : 0.4.8-1+deb11u1
    CVE ID         : CVE-2026-23490
    Debian Bug     : 1125753

    It was discovered that pyasn1, a generic ASN.1 library for Python, is
    prone to a denial of service vulnerability, which may result in memory
    exhaustion from malformed OID/RELATIVE-OID with excessive continuation
    octets.

    For Debian 11 bullseye, this problem has been fixed in version
    0.4.8-1+deb11u1.

    We recommend that you upgrade your pyasn1 packages.

    For the detailed security status of pyasn1 please refer to
    its security tracker page at:
    https://security-tracker.debian.org/tracker/pyasn1

    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

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/pyasn1");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-23490");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/bullseye/pyasn1");
  script_set_attribute(attribute:"solution", value:
"Upgrade the pypy-pyasn1 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-2026-23490");

  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:"2026/01/16");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/02/01");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/02/01");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:pypy-pyasn1");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:python-pyasn1-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:python3-pyasn1");
  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': 'pypy-pyasn1', 'reference': '0.4.8-1+deb11u1'},
    {'release': '11.0', 'prefix': 'python-pyasn1-doc', 'reference': '0.4.8-1+deb11u1'},
    {'release': '11.0', 'prefix': 'python3-pyasn1', 'reference': '0.4.8-1+deb11u1'}
];

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, 'pypy-pyasn1 / python-pyasn1-doc / python3-pyasn1');
}