Ubuntu 16.04 ESM / 18.04 LTS / 20.04 LTS : Vim vulnerabilities (USN-5147-1)

##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-5147-1. 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(155351);
  script_version("1.9");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/10/16");

  script_cve_id(
    "CVE-2017-17087",
    "CVE-2019-20807",
    "CVE-2021-3872",
    "CVE-2021-3903",
    "CVE-2021-3927",
    "CVE-2021-3928"
  );
  script_xref(name:"USN", value:"5147-1");
  script_xref(name:"IAVB", value:"2020-B-0053-S");

  script_name(english:"Ubuntu 16.04 ESM / 18.04 LTS / 20.04 LTS : Vim vulnerabilities (USN-5147-1)");

  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 host has packages installed that are affected by multiple
vulnerabilities as referenced in the USN-5147-1 advisory.

  - vim is vulnerable to Heap-based Buffer Overflow (CVE-2021-3872, CVE-2021-3903, CVE-2021-3927)

  - fileio.c in Vim prior to 8.0.1263 sets the group ownership of a .swp file to the editor's primary group
    (which may be different from the group ownership of the original file), which allows local users to obtain
    sensitive information by leveraging an applicable group membership, as demonstrated by /etc/shadow owned
    by root:shadow mode 0640, but /etc/.shadow.swp owned by root:users mode 0640, a different vulnerability
    than CVE-2017-1000382. (CVE-2017-17087)

  - In Vim before 8.1.0881, users can circumvent the rvim restricted mode and execute arbitrary OS commands
    via scripting interfaces (e.g., Python, Ruby, or Lua). (CVE-2019-20807)

  - vim is vulnerable to Use of Uninitialized Variable (CVE-2021-3928)

Note that Nessus has not tested for this issue 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-5147-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/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-2021-3927");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2021-3928");

  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:"2017/12/01");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/11/15");
  script_set_attribute(attribute:"plugin_publication_date", value:"2021/11/15");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:16.04:-:esm");
  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:"p-cpe:/a:canonical:ubuntu_linux:vim");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:vim-athena");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:vim-athena-py2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:vim-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:vim-gnome");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:vim-gnome-py2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:vim-gtk");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:vim-gtk-py2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:vim-gtk3");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:vim-gtk3-py2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:vim-gui-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:vim-lesstif");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:vim-nox");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:vim-nox-py2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:vim-runtime");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:vim-tiny");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:xxd");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_set_attribute(attribute:"stig_severity", value:"II");
  script_end_attributes();

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

  script_copyright(english:"Ubuntu Security Notice (C) 2021-2023 Canonical, Inc. / NASL script (C) 2021-2023 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)) audit(AUDIT_OS_NOT, 'Ubuntu 16.04 / 18.04 / 20.04', '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': 'vim', 'pkgver': '2:7.4.1689-3ubuntu1.5+esm3'},
    {'osver': '16.04', 'pkgname': 'vim-athena', 'pkgver': '2:7.4.1689-3ubuntu1.5+esm3'},
    {'osver': '16.04', 'pkgname': 'vim-athena-py2', 'pkgver': '2:7.4.1689-3ubuntu1.5+esm3'},
    {'osver': '16.04', 'pkgname': 'vim-common', 'pkgver': '2:7.4.1689-3ubuntu1.5+esm3'},
    {'osver': '16.04', 'pkgname': 'vim-gnome', 'pkgver': '2:7.4.1689-3ubuntu1.5+esm3'},
    {'osver': '16.04', 'pkgname': 'vim-gnome-py2', 'pkgver': '2:7.4.1689-3ubuntu1.5+esm3'},
    {'osver': '16.04', 'pkgname': 'vim-gtk', 'pkgver': '2:7.4.1689-3ubuntu1.5+esm3'},
    {'osver': '16.04', 'pkgname': 'vim-gtk-py2', 'pkgver': '2:7.4.1689-3ubuntu1.5+esm3'},
    {'osver': '16.04', 'pkgname': 'vim-gtk3', 'pkgver': '2:7.4.1689-3ubuntu1.5+esm3'},
    {'osver': '16.04', 'pkgname': 'vim-gtk3-py2', 'pkgver': '2:7.4.1689-3ubuntu1.5+esm3'},
    {'osver': '16.04', 'pkgname': 'vim-gui-common', 'pkgver': '2:7.4.1689-3ubuntu1.5+esm3'},
    {'osver': '16.04', 'pkgname': 'vim-nox', 'pkgver': '2:7.4.1689-3ubuntu1.5+esm3'},
    {'osver': '16.04', 'pkgname': 'vim-nox-py2', 'pkgver': '2:7.4.1689-3ubuntu1.5+esm3'},
    {'osver': '16.04', 'pkgname': 'vim-runtime', 'pkgver': '2:7.4.1689-3ubuntu1.5+esm3'},
    {'osver': '16.04', 'pkgname': 'vim-tiny', 'pkgver': '2:7.4.1689-3ubuntu1.5+esm3'},
    {'osver': '18.04', 'pkgname': 'vim', 'pkgver': '2:8.0.1453-1ubuntu1.7'},
    {'osver': '18.04', 'pkgname': 'vim-athena', 'pkgver': '2:8.0.1453-1ubuntu1.7'},
    {'osver': '18.04', 'pkgname': 'vim-common', 'pkgver': '2:8.0.1453-1ubuntu1.7'},
    {'osver': '18.04', 'pkgname': 'vim-gnome', 'pkgver': '2:8.0.1453-1ubuntu1.7'},
    {'osver': '18.04', 'pkgname': 'vim-gtk', 'pkgver': '2:8.0.1453-1ubuntu1.7'},
    {'osver': '18.04', 'pkgname': 'vim-gtk3', 'pkgver': '2:8.0.1453-1ubuntu1.7'},
    {'osver': '18.04', 'pkgname': 'vim-gui-common', 'pkgver': '2:8.0.1453-1ubuntu1.7'},
    {'osver': '18.04', 'pkgname': 'vim-nox', 'pkgver': '2:8.0.1453-1ubuntu1.7'},
    {'osver': '18.04', 'pkgname': 'vim-runtime', 'pkgver': '2:8.0.1453-1ubuntu1.7'},
    {'osver': '18.04', 'pkgname': 'vim-tiny', 'pkgver': '2:8.0.1453-1ubuntu1.7'},
    {'osver': '18.04', 'pkgname': 'xxd', 'pkgver': '2:8.0.1453-1ubuntu1.7'},
    {'osver': '20.04', 'pkgname': 'vim', 'pkgver': '2:8.1.2269-1ubuntu5.4'},
    {'osver': '20.04', 'pkgname': 'vim-athena', 'pkgver': '2:8.1.2269-1ubuntu5.4'},
    {'osver': '20.04', 'pkgname': 'vim-common', 'pkgver': '2:8.1.2269-1ubuntu5.4'},
    {'osver': '20.04', 'pkgname': 'vim-gtk', 'pkgver': '2:8.1.2269-1ubuntu5.4'},
    {'osver': '20.04', 'pkgname': 'vim-gtk3', 'pkgver': '2:8.1.2269-1ubuntu5.4'},
    {'osver': '20.04', 'pkgname': 'vim-gui-common', 'pkgver': '2:8.1.2269-1ubuntu5.4'},
    {'osver': '20.04', 'pkgname': 'vim-nox', 'pkgver': '2:8.1.2269-1ubuntu5.4'},
    {'osver': '20.04', 'pkgname': 'vim-runtime', 'pkgver': '2:8.1.2269-1ubuntu5.4'},
    {'osver': '20.04', 'pkgname': 'vim-tiny', 'pkgver': '2:8.1.2269-1ubuntu5.4'},
    {'osver': '20.04', 'pkgname': 'xxd', 'pkgver': '2:8.1.2269-1ubuntu5.4'}
];

var flag = 0;
foreach 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 (osver && pkgname && pkgver) {
    if (ubuntu_check(osver:osver, pkgname:pkgname, pkgver:pkgver)) flag++;
  }
}

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_WARNING,
    extra      : ubuntu_report_get()
  );
  exit(0);
}
else
{
  var tested = ubuntu_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'vim / vim-athena / vim-athena-py2 / vim-common / vim-gnome / etc');
}