Ubuntu 18.04 LTS / 20.04 LTS : Vim vulnerabilities (USN-5247-1)

#%NASL_MIN_LEVEL 70300
##
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-5247-1. The text
# itself is copyright (C) Canonical, Inc. See
# <https://ubuntu.com/security/notices>. Ubuntu(R) is a registered
# trademark of Canonical, Inc.
##

include('deprecated_nasl_level.inc');
include('compat.inc');

if (description)
{
  script_id(157143);
  script_version("1.6");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/08/27");

  script_cve_id(
    "CVE-2021-3973",
    "CVE-2021-3974",
    "CVE-2021-3984",
    "CVE-2021-4019",
    "CVE-2021-4069"
  );
  script_xref(name:"USN", value:"5247-1");

  script_name(english:"Ubuntu 18.04 LTS / 20.04 LTS : Vim vulnerabilities (USN-5247-1)");

  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 18.04 LTS / 20.04 LTS host has packages installed that are affected by multiple vulnerabilities as
referenced in the USN-5247-1 advisory.

    It was discovered that vim incorrectly handled parsing of filenames in its search functionality. If a user
    was tricked into opening a specially crafted file, an attacker could crash the application, leading to a
    denial of service. This issue only affected Ubuntu 21.10. (CVE-2021-3973)

    It was discovered that vim incorrectly handled memory when opening and searching the contents of certain
    files. If a user was tricked into opening a specially crafted file, an attacker could crash the
    application, leading to a denial of service, or possibly achieve code execution with user privileges. This
    issue only affected Ubuntu 20.04 LTS and Ubuntu 21.10. (CVE-2021-3974)

    It was discovered that vim incorrectly handled memory when opening and editing certain files. If a user
    was tricked into opening a specially crafted file, an attacker could crash the application, leading to a
    denial of service, or possibly achieve code execution with user privileges. (CVE-2021-3984)

    It was discovered that vim incorrectly handled memory when opening and editing certain files. If a user
    was tricked into opening a specially crafted file, an attacker could crash the application, leading to a
    denial of service, or possibly achieve code execution with user privileges. (CVE-2021-4019)

    It was discovered that vim incorrectly handled memory when opening and editing certain files. If a user
    was tricked into opening a specially crafted file, an attacker could crash the application, leading to a
    denial of service, or possibly achieve code execution with user privileges.(CVE-2021-4069)

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-5247-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/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:L/AC:L/PR:N/UI:R/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-2021-3973");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2021-4069");

  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:"2021/11/19");
  script_set_attribute(attribute:"patch_publication_date", value:"2022/01/27");
  script_set_attribute(attribute:"plugin_publication_date", value:"2022/01/27");

  script_set_attribute(attribute:"plugin_type", value:"local");
  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-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-gtk");
  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-gui-common");
  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-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_end_attributes();

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

  script_copyright(english:"Ubuntu Security Notice (C) 2022-2024 Canonical, Inc. / NASL script (C) 2022-2024 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 (! ('18.04' >< os_release || '20.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 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': '18.04', 'pkgname': 'vim', 'pkgver': '2:8.0.1453-1ubuntu1.8'},
    {'osver': '18.04', 'pkgname': 'vim-athena', 'pkgver': '2:8.0.1453-1ubuntu1.8'},
    {'osver': '18.04', 'pkgname': 'vim-common', 'pkgver': '2:8.0.1453-1ubuntu1.8'},
    {'osver': '18.04', 'pkgname': 'vim-gnome', 'pkgver': '2:8.0.1453-1ubuntu1.8'},
    {'osver': '18.04', 'pkgname': 'vim-gtk', 'pkgver': '2:8.0.1453-1ubuntu1.8'},
    {'osver': '18.04', 'pkgname': 'vim-gtk3', 'pkgver': '2:8.0.1453-1ubuntu1.8'},
    {'osver': '18.04', 'pkgname': 'vim-gui-common', 'pkgver': '2:8.0.1453-1ubuntu1.8'},
    {'osver': '18.04', 'pkgname': 'vim-nox', 'pkgver': '2:8.0.1453-1ubuntu1.8'},
    {'osver': '18.04', 'pkgname': 'vim-runtime', 'pkgver': '2:8.0.1453-1ubuntu1.8'},
    {'osver': '18.04', 'pkgname': 'vim-tiny', 'pkgver': '2:8.0.1453-1ubuntu1.8'},
    {'osver': '18.04', 'pkgname': 'xxd', 'pkgver': '2:8.0.1453-1ubuntu1.8'},
    {'osver': '20.04', 'pkgname': 'vim', 'pkgver': '2:8.1.2269-1ubuntu5.6'},
    {'osver': '20.04', 'pkgname': 'vim-athena', 'pkgver': '2:8.1.2269-1ubuntu5.6'},
    {'osver': '20.04', 'pkgname': 'vim-common', 'pkgver': '2:8.1.2269-1ubuntu5.6'},
    {'osver': '20.04', 'pkgname': 'vim-gtk', 'pkgver': '2:8.1.2269-1ubuntu5.6'},
    {'osver': '20.04', 'pkgname': 'vim-gtk3', 'pkgver': '2:8.1.2269-1ubuntu5.6'},
    {'osver': '20.04', 'pkgname': 'vim-gui-common', 'pkgver': '2:8.1.2269-1ubuntu5.6'},
    {'osver': '20.04', 'pkgname': 'vim-nox', 'pkgver': '2:8.1.2269-1ubuntu5.6'},
    {'osver': '20.04', 'pkgname': 'vim-runtime', 'pkgver': '2:8.1.2269-1ubuntu5.6'},
    {'osver': '20.04', 'pkgname': 'vim-tiny', 'pkgver': '2:8.1.2269-1ubuntu5.6'},
    {'osver': '20.04', 'pkgname': 'xxd', 'pkgver': '2:8.1.2269-1ubuntu5.6'}
];

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 (osver && pkgname && pkgver) {
    if (ubuntu_check(osver:osver, pkgname:pkgname, pkgver:pkgver)) 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, 'vim / vim-athena / vim-common / vim-gnome / vim-gtk / vim-gtk3 / etc');
}