Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 26.04 LTS : GVfs vulnerabilities (USN-8845-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-8845-1. 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(362461);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/10/01");

  script_cve_id("CVE-2026-84268", "CVE-2026-88924");
  script_xref(name:"USN", value:"8845-1");

  script_name(english:"Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 26.04 LTS : GVfs vulnerabilities (USN-8845-1)");

  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 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 26.04 LTS host has packages installed that
are affected by multiple vulnerabilities as referenced in the USN-8845-1 advisory.

    Keith Linneman discovered that GVfs did not properly validate data received from SFTP servers. An attacker
    could possibly use this issue to cause a heap buffer overflow, resulting in arbitrary code execution or a
    denial of service. (CVE-2026-84268)

    It was discovered that GVfs incorrectly handled file ownership when creating private D-Bus sockets in the
    admin backend. A local attacker could possibly use this issue to change the ownership of arbitrary system
    files, resulting in privilege escalation to root. This issue only affected Ubuntu 22.04 LTS, Ubuntu 24.04
    LTS, and Ubuntu 26.04 LTS. (CVE-2026-88924)

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-8845-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  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:R/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-2026-84268");

  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:"2026/09/30");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/10/01");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:16.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:18.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:20.04:-:lts");
  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:"cpe:/o:canonical:ubuntu_linux:26.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:gvfs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:gvfs-backends");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:gvfs-bin");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:gvfs-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:gvfs-daemons");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:gvfs-fuse");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:gvfs-libs");
  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) 2026 Canonical, Inc. / NASL script (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.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 (! ('16.04' >< os_release || '18.04' >< os_release || '20.04' >< os_release || '22.04' >< os_release || '24.04' >< os_release || '26.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 16.04 / 18.04 / 20.04 / 22.04 / 24.04 / 26.04', '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 pkgs = [
    {'osver': '16.04', 'pkgname': 'gvfs', 'pkgver': '1.28.2-1ubuntu1~16.04.3+esm1', 'cves': ['CVE-2026-84268']},
    {'osver': '16.04', 'pkgname': 'gvfs-backends', 'pkgver': '1.28.2-1ubuntu1~16.04.3+esm1', 'cves': ['CVE-2026-84268']},
    {'osver': '16.04', 'pkgname': 'gvfs-bin', 'pkgver': '1.28.2-1ubuntu1~16.04.3+esm1', 'cves': ['CVE-2026-84268']},
    {'osver': '16.04', 'pkgname': 'gvfs-common', 'pkgver': '1.28.2-1ubuntu1~16.04.3+esm1', 'cves': ['CVE-2026-84268']},
    {'osver': '16.04', 'pkgname': 'gvfs-daemons', 'pkgver': '1.28.2-1ubuntu1~16.04.3+esm1', 'cves': ['CVE-2026-84268']},
    {'osver': '16.04', 'pkgname': 'gvfs-fuse', 'pkgver': '1.28.2-1ubuntu1~16.04.3+esm1', 'cves': ['CVE-2026-84268']},
    {'osver': '16.04', 'pkgname': 'gvfs-libs', 'pkgver': '1.28.2-1ubuntu1~16.04.3+esm1', 'cves': ['CVE-2026-84268']},
    {'osver': '18.04', 'pkgname': 'gvfs', 'pkgver': '1.36.1-0ubuntu1.3.3+esm1', 'cves': ['CVE-2026-84268']},
    {'osver': '18.04', 'pkgname': 'gvfs-backends', 'pkgver': '1.36.1-0ubuntu1.3.3+esm1', 'cves': ['CVE-2026-84268']},
    {'osver': '18.04', 'pkgname': 'gvfs-bin', 'pkgver': '1.36.1-0ubuntu1.3.3+esm1', 'cves': ['CVE-2026-84268']},
    {'osver': '18.04', 'pkgname': 'gvfs-common', 'pkgver': '1.36.1-0ubuntu1.3.3+esm1', 'cves': ['CVE-2026-84268']},
    {'osver': '18.04', 'pkgname': 'gvfs-daemons', 'pkgver': '1.36.1-0ubuntu1.3.3+esm1', 'cves': ['CVE-2026-84268']},
    {'osver': '18.04', 'pkgname': 'gvfs-fuse', 'pkgver': '1.36.1-0ubuntu1.3.3+esm1', 'cves': ['CVE-2026-84268']},
    {'osver': '18.04', 'pkgname': 'gvfs-libs', 'pkgver': '1.36.1-0ubuntu1.3.3+esm1', 'cves': ['CVE-2026-84268']},
    {'osver': '20.04', 'pkgname': 'gvfs', 'pkgver': '1.44.1-1ubuntu1.2+esm1', 'cves': ['CVE-2026-84268']},
    {'osver': '20.04', 'pkgname': 'gvfs-backends', 'pkgver': '1.44.1-1ubuntu1.2+esm1', 'cves': ['CVE-2026-84268']},
    {'osver': '20.04', 'pkgname': 'gvfs-bin', 'pkgver': '1.44.1-1ubuntu1.2+esm1', 'cves': ['CVE-2026-84268']},
    {'osver': '20.04', 'pkgname': 'gvfs-common', 'pkgver': '1.44.1-1ubuntu1.2+esm1', 'cves': ['CVE-2026-84268']},
    {'osver': '20.04', 'pkgname': 'gvfs-daemons', 'pkgver': '1.44.1-1ubuntu1.2+esm1', 'cves': ['CVE-2026-84268']},
    {'osver': '20.04', 'pkgname': 'gvfs-fuse', 'pkgver': '1.44.1-1ubuntu1.2+esm1', 'cves': ['CVE-2026-84268']},
    {'osver': '20.04', 'pkgname': 'gvfs-libs', 'pkgver': '1.44.1-1ubuntu1.2+esm1', 'cves': ['CVE-2026-84268']},
    {'osver': '22.04', 'pkgname': 'gvfs', 'pkgver': '1.48.2-0ubuntu1.2', 'cves': ['CVE-2026-84268', 'CVE-2026-88924']},
    {'osver': '22.04', 'pkgname': 'gvfs-backends', 'pkgver': '1.48.2-0ubuntu1.2', 'cves': ['CVE-2026-84268', 'CVE-2026-88924']},
    {'osver': '22.04', 'pkgname': 'gvfs-common', 'pkgver': '1.48.2-0ubuntu1.2', 'cves': ['CVE-2026-84268', 'CVE-2026-88924']},
    {'osver': '22.04', 'pkgname': 'gvfs-daemons', 'pkgver': '1.48.2-0ubuntu1.2', 'cves': ['CVE-2026-84268', 'CVE-2026-88924']},
    {'osver': '22.04', 'pkgname': 'gvfs-fuse', 'pkgver': '1.48.2-0ubuntu1.2', 'cves': ['CVE-2026-84268', 'CVE-2026-88924']},
    {'osver': '22.04', 'pkgname': 'gvfs-libs', 'pkgver': '1.48.2-0ubuntu1.2', 'cves': ['CVE-2026-84268', 'CVE-2026-88924']},
    {'osver': '24.04', 'pkgname': 'gvfs', 'pkgver': '1.54.4-0ubuntu1~24.04.4', 'cves': ['CVE-2026-84268', 'CVE-2026-88924']},
    {'osver': '24.04', 'pkgname': 'gvfs-backends', 'pkgver': '1.54.4-0ubuntu1~24.04.4', 'cves': ['CVE-2026-84268', 'CVE-2026-88924']},
    {'osver': '24.04', 'pkgname': 'gvfs-common', 'pkgver': '1.54.4-0ubuntu1~24.04.4', 'cves': ['CVE-2026-84268', 'CVE-2026-88924']},
    {'osver': '24.04', 'pkgname': 'gvfs-daemons', 'pkgver': '1.54.4-0ubuntu1~24.04.4', 'cves': ['CVE-2026-84268', 'CVE-2026-88924']},
    {'osver': '24.04', 'pkgname': 'gvfs-fuse', 'pkgver': '1.54.4-0ubuntu1~24.04.4', 'cves': ['CVE-2026-84268', 'CVE-2026-88924']},
    {'osver': '24.04', 'pkgname': 'gvfs-libs', 'pkgver': '1.54.4-0ubuntu1~24.04.4', 'cves': ['CVE-2026-84268', 'CVE-2026-88924']},
    {'osver': '26.04', 'pkgname': 'gvfs', 'pkgver': '1.60.0-1ubuntu0.1', 'cves': ['CVE-2026-84268', 'CVE-2026-88924']},
    {'osver': '26.04', 'pkgname': 'gvfs-backends', 'pkgver': '1.60.0-1ubuntu0.1', 'cves': ['CVE-2026-84268', 'CVE-2026-88924']},
    {'osver': '26.04', 'pkgname': 'gvfs-common', 'pkgver': '1.60.0-1ubuntu0.1', 'cves': ['CVE-2026-84268', 'CVE-2026-88924']},
    {'osver': '26.04', 'pkgname': 'gvfs-daemons', 'pkgver': '1.60.0-1ubuntu0.1', 'cves': ['CVE-2026-84268', 'CVE-2026-88924']},
    {'osver': '26.04', 'pkgname': 'gvfs-fuse', 'pkgver': '1.60.0-1ubuntu0.1', 'cves': ['CVE-2026-84268', 'CVE-2026-88924']},
    {'osver': '26.04', 'pkgname': 'gvfs-libs', 'pkgver': '1.60.0-1ubuntu0.1', 'cves': ['CVE-2026-84268', 'CVE-2026-88924']}
];

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'];
  if (osver && pkgname && pkgver) {
    if (deb_check(release:osver, prefix:pkgname, reference:pkgver, cves:cves)) flag++;
  }
}

if (flag)
{
  var extra = '';
  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, 'gvfs / gvfs-backends / gvfs-bin / gvfs-common / gvfs-daemons / etc');
}