Amazon Linux 2023 : clamav1.4, clamav1.4-data, clamav1.4-devel (ALAS2023-2026-2084)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Amazon Linux 2023 Security Advisory ALAS2023-2026-2084.
##

include('compat.inc');

if (description)
{
  script_id(342038);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/08/31");

  script_cve_id(
    "CVE-2026-20339",
    "CVE-2026-20345",
    "CVE-2026-20346",
    "CVE-2026-20347",
    "CVE-2026-20348"
  );
  script_xref(name:"IAVB", value:"2026-B-0225");

  script_name(english:"Amazon Linux 2023 : clamav1.4, clamav1.4-data, clamav1.4-devel (ALAS2023-2026-2084)");

  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 ALAS2023-2026-2084 advisory.

    A vulnerability in the PESpin file format parser of ClamAV could allow an unauthenticated, remote attacker
    to cause a DoS condition or possibly other expanded impacts as a result of memory corruption on an
    affected device.

    This vulnerability is due to improper boundary checks for content in PESpin files during scanning, which
    may result in an integer overflow. An attacker could exploit this vulnerability by submitting a crafted
    file that contains PESpin content to be scanned by ClamAV on an affected device. A successful exploit
    could allow the attacker to cause the ClamAV scanning process to terminate, resulting in a DoS condition
    on the affected software. (CVE-2026-20339)

    A vulnerability in the GPT file format parser of ClamAV could allow an unauthenticated, remote attacker to
    cause a DoS condition or possibly other expanded impacts as a result of memory corruption on an affected
    device.

    This vulnerability is due to improper handling of an endian conversion operation, which may result in an
    out-of-bounds buffer write. An attacker could exploit this vulnerability by submitting a crafted GPT file
    to be scanned by ClamAV on an affected device. A successful exploit could allow the attacker to cause the
    ClamAV scanning process to terminate, resulting in a DoS condition on the affected software.
    (CVE-2026-20345)

    A vulnerability in the PDF file format parser of ClamAV could allow an unauthenticated, remote attacker to
    cause a DoS condition or possibly other expanded impacts as a result of memory corruption on an affected
    device.

    This vulnerability is due to improper boundary checks for content in PDF files during scanning, which may
    result in an out-of-bounds buffer read. An attacker could exploit this vulnerability by submitting a
    crafted PDF file to be scanned by ClamAV on an affected device. A successful exploit could allow the
    attacker to cause the ClamAV scanning process to terminate, resulting in a DoS condition on the affected
    software. (CVE-2026-20346)

    A vulnerability in the Mach-O file format parser of ClamAV could allow an unauthenticated, remote attacker
    to cause a DoS condition or possibly other expanded impacts as a result of memory corruption on an
    affected device.

    This vulnerability is due to improper boundary checks for content in Mach-O files during scanning, which
    may result in an out-of-bounds buffer read. An attacker could exploit this vulnerability by submitting a
    crafted Mach-O file to be scanned by ClamAV on an affected device. A successful exploit could allow the
    attacker to cause the ClamAV scanning process to terminate, resulting in a DoS condition on the affected
    software. (CVE-2026-20347)

    A vulnerability in the XAR file format parser of ClamAV could allow an unauthenticated, remote attacker to
    cause a DoS condition or possibly other expanded impacts as a result of memory corruption on an affected
    device.

    This vulnerability is due to improper boundary checks for content in XAR files during scanning. An
    attacker could exploit this vulnerability by submitting a crafted file that contains XAR content to be
    scanned by ClamAV on an affected device. A successful exploit could allow the attacker to cause the ClamAV
    scanning process to terminate, resulting in a DoS condition on the affected software. (CVE-2026-20348)

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/ALAS2023-2026-2084.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-2026-20339.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-20345.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-20346.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-20347.html");
  script_set_attribute(attribute:"see_also", value:"https://explore.alas.aws.amazon.com/CVE-2026-20348.html");
  script_set_attribute(attribute:"solution", value:
"Run 'dnf update clamav1.4 --releasever 2023.12.20260831' or
  or 'dnf update --advisory ALAS2023-2026-2084 --releasever 2023.12.20260831' to update your system.");
  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-2026-20348");

  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:"2026/08/07");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/08/31");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/08/31");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:clamav1.4");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:clamav1.4-data");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:clamav1.4-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:clamav1.4-debugsource");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:clamav1.4-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:clamav1.4-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:clamav1.4-filesystem");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:clamav1.4-freshclam");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:clamav1.4-freshclam-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:clamav1.4-lib");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:clamav1.4-lib-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:clamav1.4-milter");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:clamav1.4-milter-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:clamd1.4");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:clamd1.4-debuginfo");
  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':'clamav1.4-1.4.6-1.amzn2023.0.1', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'clamav1.4-1.4.6-1.amzn2023.0.1', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'clamav1.4-data-1.4.6-1.amzn2023.0.1', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'clamav1.4-debuginfo-1.4.6-1.amzn2023.0.1', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'clamav1.4-debuginfo-1.4.6-1.amzn2023.0.1', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'clamav1.4-debugsource-1.4.6-1.amzn2023.0.1', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'clamav1.4-debugsource-1.4.6-1.amzn2023.0.1', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'clamav1.4-devel-1.4.6-1.amzn2023.0.1', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'clamav1.4-devel-1.4.6-1.amzn2023.0.1', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'clamav1.4-doc-1.4.6-1.amzn2023.0.1', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'clamav1.4-filesystem-1.4.6-1.amzn2023.0.1', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'clamav1.4-freshclam-1.4.6-1.amzn2023.0.1', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'clamav1.4-freshclam-1.4.6-1.amzn2023.0.1', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'clamav1.4-freshclam-debuginfo-1.4.6-1.amzn2023.0.1', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'clamav1.4-freshclam-debuginfo-1.4.6-1.amzn2023.0.1', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'clamav1.4-lib-1.4.6-1.amzn2023.0.1', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'clamav1.4-lib-1.4.6-1.amzn2023.0.1', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'clamav1.4-lib-debuginfo-1.4.6-1.amzn2023.0.1', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'clamav1.4-lib-debuginfo-1.4.6-1.amzn2023.0.1', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'clamav1.4-milter-1.4.6-1.amzn2023.0.1', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'clamav1.4-milter-1.4.6-1.amzn2023.0.1', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'clamav1.4-milter-debuginfo-1.4.6-1.amzn2023.0.1', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'clamav1.4-milter-debuginfo-1.4.6-1.amzn2023.0.1', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'clamd1.4-1.4.6-1.amzn2023.0.1', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'clamd1.4-1.4.6-1.amzn2023.0.1', 'cpu':'x86_64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'clamd1.4-debuginfo-1.4.6-1.amzn2023.0.1', 'cpu':'aarch64', 'release':'AL-2023', 'rpm_spec_vers_cmp':TRUE},
    {'reference':'clamd1.4-debuginfo-1.4.6-1.amzn2023.0.1', '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_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, "clamav1.4 / clamav1.4-data / clamav1.4-debuginfo / etc");
}