Amazon Linux 2023 : python3, python3-devel, python3-idle (ALAS2023-2026-1963)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Amazon Linux 2023 Security Advisory ALAS2023-2026-1963.
##

include('compat.inc');

if (description)
{
  script_id(328474);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/07/20");

  script_cve_id(
    "CVE-2026-0864",
    "CVE-2026-3276",
    "CVE-2026-9669",
    "CVE-2026-11940",
    "CVE-2026-11972"
  );
  script_xref(name:"IAVA", value:"2026-A-0549");

  script_name(english:"Amazon Linux 2023 : python3, python3-devel, python3-idle (ALAS2023-2026-1963)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Amazon Linux 2023 host is missing a security update.");
  script_set_attribute(attribute:"description", value:
"It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-1963 advisory.

    When using the configparser module to write configuration filescontaining multi-line text values with
    carriage return characters (\r) theresulting file could be injected with unexpected keys and values if
    theattacker controls the written value. (CVE-2026-0864)

    tarfile.extractall() with the 'data' or 'tar'filter could be bypassed by a crafted archive where a
    hardlinkreferences a symlink stored at a deeper name than the hardlink itself.The extraction fallback
    validated the symlink at it's archived locationbut recreated it at the hardlink's shallowerpath, letting a
    relativetarget the filter judged contained escape the destination directory.This allowed a malicious tar
    archive to create a symlink pointingoutside the destination, enabling out-of-destination file reads
    orwrites. This was an incomplete fix of CVE-2025-4330. (CVE-2026-11940)

    When using the tarfile module with a file opened in streaming mode (mode=r|) the tarfile module did
    not properly handle EOF, making archive parsing take exponentially longer. (CVE-2026-11972)

    unicodedata.normalize() can take excessive CPU time when processing specially crafted Unicode input
    containing long runs of combining characters with alternating Canonical Combining Class values. This
    affects all normalization forms. (CVE-2026-3276)

    bz2.BZ2Decompressor objects could be reused after a decompression error. If an application caught the
    resulting OSError and retried with the same decompressor, crafted input could cause the decompressor to
    resume from an invalid internal state and perform out-of-bounds writes to a stack buffer. This could crash
    the process when processing untrusted data. (CVE-2026-9669)

Tenable has extracted the preceding description block directly from the tested product 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://alas.aws.amazon.com//AL2023/ALAS2023-2026-1963.html");
  script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/faqs.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-0864.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-11940.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-11972.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-3276.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-9669.html");
  script_set_attribute(attribute:"solution", value:
"Run 'dnf update python3.9 --releasever 2023.12.20260720' or
  or 'dnf update --advisory ALAS2023-2026-1963 --releasever 2023.12.20260720' to update your system.");
  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: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:"cvss4_vector", value:"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/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-2026-3276");
  script_set_attribute(attribute:"cvss4_score_source", value:"CVE-2026-9669");

  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:"2026/06/03");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/07/20");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/07/20");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:python-unversioned-command");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:python3");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:python3-debug");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:python3-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:python3-idle");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:python3-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:python3-test");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:python3-tkinter");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:python3.9-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:python3.9-debugsource");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:amazon:linux:2023");
  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:"Amazon Linux 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/AmazonLinux/release", "Host/AmazonLinux/rpm-list");

  exit(0);
}

include("rpm2.inc");

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);

var alas_release = get_kb_item("Host/AmazonLinux/release");
if (isnull(alas_release) || !strlen(alas_release)) audit(AUDIT_OS_NOT, "Amazon Linux");
var os_ver = pregmatch(pattern: "^AL(A|\d+|-\d+)", string:alas_release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Amazon Linux");
os_ver = os_ver[1];
if (os_ver != "-2023")
{
  if (os_ver == 'A') os_ver = 'AMI';
  audit(AUDIT_OS_NOT, "Amazon Linux 2023", "Amazon Linux " + os_ver);
}

if (!get_kb_item("Host/AmazonLinux/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);

var pkgs = [
    {'reference':'python-unversioned-command-3.9.25-1.amzn2023.0.8', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'python3-3.9.25-1.amzn2023.0.8', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'python3-3.9.25-1.amzn2023.0.8', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'python3-debug-3.9.25-1.amzn2023.0.8', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'python3-debug-3.9.25-1.amzn2023.0.8', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'python3-devel-3.9.25-1.amzn2023.0.8', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'python3-devel-3.9.25-1.amzn2023.0.8', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'python3-idle-3.9.25-1.amzn2023.0.8', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'python3-idle-3.9.25-1.amzn2023.0.8', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'python3-libs-3.9.25-1.amzn2023.0.8', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'python3-libs-3.9.25-1.amzn2023.0.8', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'python3-test-3.9.25-1.amzn2023.0.8', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'python3-test-3.9.25-1.amzn2023.0.8', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'python3-tkinter-3.9.25-1.amzn2023.0.8', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'python3-tkinter-3.9.25-1.amzn2023.0.8', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'python3.9-debuginfo-3.9.25-1.amzn2023.0.8', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'python3.9-debuginfo-3.9.25-1.amzn2023.0.8', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'python3.9-debugsource-3.9.25-1.amzn2023.0.8', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'python3.9-debugsource-3.9.25-1.amzn2023.0.8', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE}
];

var flag = 0;
foreach var package_array ( pkgs ) {
  var reference = NULL;
  var _release = NULL;
  var sp = NULL;
  var _cpu = NULL;
  var el_string = NULL;
  var rpm_spec_vers_cmp = NULL;
  var epoch = NULL;
  var allowmaj = NULL;
  var exists_check = NULL;
  var cves = NULL;
  if (!empty_or_null(package_array['reference'])) reference = package_array['reference'];
  if (!empty_or_null(package_array['release'])) _release = package_array['release'];
  if (!empty_or_null(package_array['sp'])) sp = package_array['sp'];
  if (!empty_or_null(package_array['cpu'])) _cpu = package_array['cpu'];
  if (!empty_or_null(package_array['el_string'])) el_string = package_array['el_string'];
  if (!empty_or_null(package_array['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = package_array['rpm_spec_vers_cmp'];
  if (!empty_or_null(package_array['epoch'])) epoch = package_array['epoch'];
  if (!empty_or_null(package_array['allowmaj'])) allowmaj = package_array['allowmaj'];
  if (!empty_or_null(package_array['exists_check'])) exists_check = package_array['exists_check'];
  if (!empty_or_null(package_array['cves'])) cves = package_array['cves'];
  if (reference && _release && (!exists_check || rpm_exists(release:_release, rpm:exists_check))) {
    if (rpm_check(release:_release, sp:sp, cpu:_cpu, reference:reference, epoch:epoch, el_string:el_string, rpm_spec_vers_cmp:rpm_spec_vers_cmp, allowmaj:allowmaj, cves:cves)) flag++;
  }
}

if (flag)
{
  security_report_v4(
      port       : 0,
      severity   : SECURITY_WARNING,
      extra      : rpm_report_get()
  );
  exit(0);
}
else
{
  var tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "python-unversioned-command / python3 / python3-debug / etc");
}