Amazon Linux 2 : thunderbird (ALAS-2026-3952)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Amazon Linux 2 Security Advisory ALAS-2026-3952.
##

include('compat.inc');

if (description)
{
  script_id(351035);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/09/29");

  script_cve_id(
    "CVE-2026-84639",
    "CVE-2026-84640",
    "CVE-2026-84641",
    "CVE-2026-92014",
    "CVE-2026-92017",
    "CVE-2026-92021",
    "CVE-2026-92238",
    "CVE-2026-92239",
    "CVE-2026-92240"
  );
  script_xref(name:"IAVA", value:"2026-A-0929-S");
  script_xref(name:"IAVA", value:"2026-A-1017");

  script_name(english:"Amazon Linux 2 : thunderbird (ALAS-2026-3952)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Amazon Linux 2 host is missing a security update.");
  script_set_attribute(attribute:"description", value:
"The version of thunderbird installed on the remote host is prior to 140.16.0-1. It is, therefore, affected by multiple
vulnerabilities as referenced in the ALAS2-2026-3952 advisory.

    Triggering an error condition in certain MIME bodies would cause uninitialized memory to be used. This
    vulnerability was fixed in Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2. (CVE-2026-84639)

    A maliciously constructed mail header could lead to a one byte read past the end of a buffer. This
    vulnerability was fixed in Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2. (CVE-2026-84640)

    A malicious IMAP server can trigger use-after-free and heap-memory disclosure by sending a crafted ID
    response. Heap contents can ultimately be persisted to prefs.js. This vulnerability was fixed in
    Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2. (CVE-2026-84641)

    Privilege escalation due to incorrect boundary conditions in the Graphics component. This vulnerability
    was fixed in Firefox ESR 115.41, Firefox ESR 140.16, and Thunderbird 140.16. (CVE-2026-92014)

    Privilege escalation in the DOM: Service Workers component. This vulnerability was fixed in Firefox 156,
    Firefox ESR 115.41, Firefox ESR 140.16, and Firefox ESR 153.3. (CVE-2026-92017)

    Use-after-free in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox ESR 140.16
    and Thunderbird 140.16. (CVE-2026-92021)

    A maliciously constructed mail header could lead to multiple fields being parsed as one, or potential
    memory safety violations. This vulnerability was fixed in Thunderbird 156, Thunderbird 140.16, and
    Thunderbird 153.3. (CVE-2026-92238)

    A maliciously constructed IMAP line could cause an out-of-bounds buffer read. This vulnerability was fixed
    in Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3. (CVE-2026-92239)

    A malicious or compromised IMAP server can trigger an out-of-bounds read in the IMAP response parser by
    sending an untagged '* ID' response, crashing Thunderbird. The affected parsing path is reachable before
    authentication. This vulnerability was fixed in Thunderbird 156 and Thunderbird 140.16. (CVE-2026-92240)

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//AL2/ALAS2-2026-3952.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-2026-84639.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-84640.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-84641.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-92014.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-92017.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-92021.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-92238.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-92239.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-92240.html");
  script_set_attribute(attribute:"solution", value:
"Run 'yum update thunderbird' or
  or 'yum update --advisory ALAS2-2026-3952' to update your system.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/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:N/UI:N/S:U/C:H/I:H/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-2026-92238");

  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:"2026/09/01");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/09/28");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/09/29");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:thunderbird");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:amazon:linux:2");
  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 != "2")
{
  if (os_ver == 'A') os_ver = 'AMI';
  audit(AUDIT_OS_NOT, "Amazon Linux 2", "Amazon Linux " + os_ver);
}

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

var pkgs = [
    {'reference':'thunderbird-140.16.0-1.amzn2.0.1', 'cpu':'aarch64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE, 'allowmaj':TRUE},
    {'reference':'thunderbird-140.16.0-1.amzn2.0.1', 'cpu':'x86_64', 'release':'AL2', 'rpm_spec_vers_cmp':TRUE, 'allowmaj':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_HOLE,
      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, "thunderbird");
}