Ubuntu 22.04 LTS / 24.04 LTS : Nix vulnerabilities (USN-7633-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-7633-1. The text
# itself is copyright (C) Canonical, Inc. See
# <https://ubuntu.com/security/notices>. Ubuntu(R) is a registered
# trademark of Canonical, Inc.
##

include('compat.inc');

if (description)
{
  script_id(242201);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/07/16");

  script_cve_id(
    "CVE-2024-27297",
    "CVE-2024-38531",
    "CVE-2024-45593",
    "CVE-2024-47174"
  );
  script_xref(name:"USN", value:"7633-1");

  script_name(english:"Ubuntu 22.04 LTS / 24.04 LTS : Nix vulnerabilities (USN-7633-1)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Ubuntu host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The remote Ubuntu 22.04 LTS / 24.04 LTS host has packages installed that are affected by multiple vulnerabilities as
referenced in the USN-7633-1 advisory.

    Linus Heckemann discovered that Nix did not correctly handle certain binaries. An attacker could possibly
    use this issue to execute arbitrary code. (CVE-2024-38531)

    Pierre-Etienne Meunier discovered that Nix did not correctly handle TLS certificates. A remote attacker
    could possibly use this issue to leak sensitive information. (CVE-2024-47174)

    It was discovered that Nix did not correctly handle Unix sockets. An attacker could possibly use this
    issue execute arbitrary code. This issue only affected Ubuntu 24.04 LTS. (CVE-2024-27297)

    It was discovered that Nix did not correctly handle unpacking Nix archives (NARS). If a user or automated
    system were tricked into opening a specially crafted file, an attacker could possibly use this issue to
    cause a denial of service or execute arbitrary code. (CVE-2024-45593)

Tenable has extracted the preceding description block directly from the Ubuntu 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://ubuntu.com/security/notices/USN-7633-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected nix-bin and / or nix-setup-systemd packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2024-45593");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2024/03/11");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/07/14");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/07/16");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:22.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:24.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:nix-bin");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:nix-setup-systemd");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Ubuntu Local Security Checks");

  script_copyright(english:"Ubuntu Security Notice (C) 2025 Canonical, Inc. / NASL script (C) 2025 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl", "ubuntu_pro_sub_detect.nasl");
  script_require_keys("Host/cpu", "Host/Ubuntu", "Host/Ubuntu/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);
var os_release = get_kb_item('Host/Ubuntu/release');
if ( isnull(os_release) ) audit(AUDIT_OS_NOT, 'Ubuntu');
os_release = chomp(os_release);
if (! ('22.04' >< os_release || '24.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 22.04 / 24.04', 'Ubuntu ' + os_release);
if ( ! get_kb_item('Host/Debian/dpkg-l') ) audit(AUDIT_PACKAGE_LIST_MISSING);

var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 's390' >!< cpu && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Ubuntu', cpu);
var ubuntu_pro_detected = get_kb_item('Host/Ubuntu/Pro/Services/esm-apps');
ubuntu_pro_detected = !empty_or_null(ubuntu_pro_detected);

var pro_caveat_needed = FALSE;

var pkgs = [
    {'osver': '22.04', 'pkgname': 'nix-bin', 'pkgver': '2.6.0+dfsg-3ubuntu0.1~esm1', 'ubuntu_pro': TRUE, 'cves': ['CVE-2024-38531', 'CVE-2024-45593', 'CVE-2024-47174']},
    {'osver': '22.04', 'pkgname': 'nix-setup-systemd', 'pkgver': '2.6.0+dfsg-3ubuntu0.1~esm1', 'ubuntu_pro': TRUE, 'cves': ['CVE-2024-38531', 'CVE-2024-45593', 'CVE-2024-47174']},
    {'osver': '24.04', 'pkgname': 'nix-bin', 'pkgver': '2.18.1+dfsg-1ubuntu5+esm2', 'ubuntu_pro': TRUE, 'cves': ['CVE-2024-27297', 'CVE-2024-38531', 'CVE-2024-45593', 'CVE-2024-47174']},
    {'osver': '24.04', 'pkgname': 'nix-setup-systemd', 'pkgver': '2.18.1+dfsg-1ubuntu5+esm2', 'ubuntu_pro': TRUE, 'cves': ['CVE-2024-27297', 'CVE-2024-38531', 'CVE-2024-45593', 'CVE-2024-47174']}
];

var flag = 0;
foreach var package_array ( pkgs ) {
  var osver = NULL;
  var pkgname = NULL;
  var pkgver = NULL;
  if (!empty_or_null(package_array['osver'])) osver = package_array['osver'];
  if (!empty_or_null(package_array['pkgname'])) pkgname = package_array['pkgname'];
  if (!empty_or_null(package_array['pkgver'])) pkgver = package_array['pkgver'];
  if (!empty_or_null(package_array['cves'])) cves = package_array['cves'];
  var pro_required = NULL;
  if (!empty_or_null(package_array['ubuntu_pro'])) pro_required = package_array['ubuntu_pro'];
  if (osver && pkgname && pkgver) {
    if (deb_check(release:osver, prefix:pkgname, reference:pkgver, cves:cves)) {
        flag++;
        if (!ubuntu_pro_detected && !pro_caveat_needed) pro_caveat_needed = pro_required;
    }
  }
}

if (flag)
{
  var extra = '';
  if (pro_caveat_needed) {
    extra += 'NOTE: This vulnerability check contains fixes that apply to packages only \n';
    extra += 'available in Ubuntu ESM repositories. Access to these package security updates \n';
    extra += 'require an Ubuntu Pro subscription.\n\n';
  }
  extra += ubuntu_report_get();
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : extra
  );
  exit(0);
}
else
{
  var tested = ubuntu_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'nix-bin / nix-setup-systemd');
}