Debian dla-4532 : idle-python3.9 - 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-4532. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('compat.inc');

if (description)
{
  script_id(307623);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/04/20");

  script_cve_id("CVE-2025-15366", "CVE-2025-15367", "CVE-2026-6100");

  script_name(english:"Debian dla-4532 : idle-python3.9 - 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 11 host has packages installed that are affected by multiple vulnerabilities as referenced in the
dla-4532 advisory.

    - -------------------------------------------------------------------------
    Debian LTS Advisory DLA-4532-1                [email protected]
    https://www.debian.org/lts/security/                     Arnaud Rebillout
    April 15, 2026                                https://wiki.debian.org/LTS
    - -------------------------------------------------------------------------

    Package        : python3.9
    Version        : 3.9.2-1+deb11u6
    CVE ID         : CVE-2025-15366 CVE-2025-15367 CVE-2026-6100
    Debian Bug     :

    It was found that the patches for CVE-2025-15366 and CVE-2025-15367
    break backward compatibility, and upstream decided not to backport those
    patches to older Python releases. Therefore those 2 patches, applied in
    the previous version (python3.9 3.9.2-1+deb11u5), have been reverted.

    Additionally, the following CVE have been fixed:

    CVE-2026-6100

        Use-after-free (UAF) was possible in the `lzma.LZMADecompressor` and
        `bz2.BZ2Decompressor` when a memory allocation fails with a
        `MemoryError` and the decompression instance is re-used. This
        scenario can be triggered if the process is under memory pressure.
        The vulnerability is only present if the program re-uses
        decompressor instances across multiple decompression calls even
        after a `MemoryError` is raised during decompression. Using the
        helper functions to one-shot decompress data such as
        `lzma.decompress()` and `bz2.decompress()` are not affected as a new
        decompressor instance is used per call. If the decompressor instance
        is not re-used after an error condition, this usage is similarly not
        vulnerable.

    For Debian 11 bullseye, these problems have been fixed in version
    3.9.2-1+deb11u6.

    We recommend that you upgrade your python3.9 packages.

    For the detailed security status of python3.9 please refer to
    its security tracker page at:
    https://security-tracker.debian.org/tracker/python3.9

    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 these issues 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/python3.9");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2025-15366");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2025-15367");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-6100");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/bullseye/python3.9");
  script_set_attribute(attribute:"solution", value:
"Upgrade the idle-python3.9 packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:M/C:P/I:C/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:L/UI:N/S:U/C:L/I:H/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss4_vector", value:"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N");
  script_set_attribute(attribute:"cvss4_threat_vector", value:"CVSS:4.0/E:U");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2025-15367");
  script_set_attribute(attribute:"cvss4_score_source", value:"CVE-2026-6100");

  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:"2026/01/20");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/04/15");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/04/20");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:idle-python3.9");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libpython3.9");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libpython3.9-dbg");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libpython3.9-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libpython3.9-minimal");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libpython3.9-stdlib");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libpython3.9-testsuite");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:python3.9");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:python3.9-dbg");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:python3.9-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:python3.9-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:python3.9-examples");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:python3.9-full");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:python3.9-minimal");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:python3.9-venv");
  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': 'idle-python3.9', 'reference': '3.9.2-1+deb11u6'},
    {'release': '11.0', 'prefix': 'libpython3.9', 'reference': '3.9.2-1+deb11u6'},
    {'release': '11.0', 'prefix': 'libpython3.9-dbg', 'reference': '3.9.2-1+deb11u6'},
    {'release': '11.0', 'prefix': 'libpython3.9-dev', 'reference': '3.9.2-1+deb11u6'},
    {'release': '11.0', 'prefix': 'libpython3.9-minimal', 'reference': '3.9.2-1+deb11u6'},
    {'release': '11.0', 'prefix': 'libpython3.9-stdlib', 'reference': '3.9.2-1+deb11u6'},
    {'release': '11.0', 'prefix': 'libpython3.9-testsuite', 'reference': '3.9.2-1+deb11u6'},
    {'release': '11.0', 'prefix': 'python3.9', 'reference': '3.9.2-1+deb11u6'},
    {'release': '11.0', 'prefix': 'python3.9-dbg', 'reference': '3.9.2-1+deb11u6'},
    {'release': '11.0', 'prefix': 'python3.9-dev', 'reference': '3.9.2-1+deb11u6'},
    {'release': '11.0', 'prefix': 'python3.9-doc', 'reference': '3.9.2-1+deb11u6'},
    {'release': '11.0', 'prefix': 'python3.9-examples', 'reference': '3.9.2-1+deb11u6'},
    {'release': '11.0', 'prefix': 'python3.9-full', 'reference': '3.9.2-1+deb11u6'},
    {'release': '11.0', 'prefix': 'python3.9-minimal', 'reference': '3.9.2-1+deb11u6'},
    {'release': '11.0', 'prefix': 'python3.9-venv', 'reference': '3.9.2-1+deb11u6'}
];

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, 'idle-python3.9 / libpython3.9 / libpython3.9-dbg / libpython3.9-dev / etc');
}