Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS : Python vulnerabilities (USN-4428-1)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-4428-1. The text 
# itself is copyright (C) Canonical, Inc. See 
# <http://www.ubuntu.com/usn/>. Ubuntu(R) is a registered 
# trademark of Canonical, Inc.
#

include('compat.inc');

if (description)
{
  script_id(138872);
  script_version("1.9");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/10/21");

  script_cve_id(
    "CVE-2019-17514",
    "CVE-2019-20907",
    "CVE-2019-9674",
    "CVE-2020-14422"
  );
  script_xref(name:"USN", value:"4428-1");
  script_xref(name:"IAVA", value:"2020-A-0340-S");

  script_name(english:"Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS : Python vulnerabilities (USN-4428-1)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Ubuntu host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"It was discovered that Python documentation had a misleading
information. A security issue could be possibly caused by wrong
assumptions of this information. This issue only affected Ubuntu 12.04
ESM, Ubuntu 14.04 ESM, Ubuntu 16.04 LTS and Ubuntu 18.04 LTS.
(CVE-2019-17514) It was discovered that Python incorrectly handled
certain TAR archives. An attacker could possibly use this issue to
cause a denial of service. (CVE-2019-20907) It was discovered that
incorrectly handled certain ZIP files. An attacker could possibly use
this issue to cause a denial of service. This issue only affected
Ubuntu 12.04 ESM, Ubuntu 14.04 ESM, Ubuntu 16.04 LTS and Ubuntu 18.04
LTS. (CVE-2019-9674) It was discovered that Python incorrectly handled
certain IP values. An attacker could possibly use this issue to cause
a denial of service. This issue only affected Ubuntu 14.04 ESM, Ubuntu
16.04 LTS, Ubuntu 18.04 LTS and Ubuntu 20.04 LTS. (CVE-2020-14422).

Note that Tenable Network Security has extracted the preceding
description block directly from the Ubuntu security advisory. Tenable
has attempted to automatically clean and format it as much as possible
without introducing additional issues.");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/notices/USN-4428-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:N");
  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:N/UI:N/S:U/C:N/I:H/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2019-17514");

  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:"2019/10/12");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/07/22");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/07/23");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:python2.7");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:python2.7-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:python2.7-examples");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:python2.7-minimal");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:python3.4");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:python3.4-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:python3.4-examples");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:python3.4-minimal");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:python3.4-venv");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:python3.5");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:python3.5-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:python3.5-examples");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:python3.5-minimal");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:python3.5-venv");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:python3.6");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:python3.6-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:python3.6-examples");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:python3.6-minimal");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:python3.6-venv");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:python3.8");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:python3.8-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:python3.8-examples");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:python3.8-minimal");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:python3.8-venv");
  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:"p-cpe:/a:canonical:ubuntu_linux:idle-python2.7");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:idle-python3.4");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:idle-python3.5");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:idle-python3.6");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:idle-python3.8");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libpython2.7");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libpython2.7-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libpython2.7-minimal");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libpython2.7-stdlib");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libpython2.7-testsuite");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libpython3.4");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libpython3.4-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libpython3.4-minimal");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libpython3.4-stdlib");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libpython3.4-testsuite");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libpython3.5");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libpython3.5-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libpython3.5-minimal");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libpython3.5-stdlib");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libpython3.5-testsuite");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libpython3.6");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libpython3.6-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libpython3.6-minimal");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libpython3.6-stdlib");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libpython3.6-testsuite");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libpython3.8");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libpython3.8-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libpython3.8-minimal");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libpython3.8-stdlib");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libpython3.8-testsuite");
  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:"Ubuntu Local Security Checks");

  script_copyright(english:"Ubuntu Security Notice (C) 2020-2023 Canonical, Inc. / NASL script (C) 2020-2023 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': 'idle-python2.7', 'pkgver': '2.7.12-1ubuntu0~16.04.12'},
    {'osver': '16.04', 'pkgname': 'idle-python3.5', 'pkgver': '3.5.2-2ubuntu0~16.04.11'},
    {'osver': '16.04', 'pkgname': 'libpython2.7', 'pkgver': '2.7.12-1ubuntu0~16.04.12'},
    {'osver': '16.04', 'pkgname': 'libpython2.7-dev', 'pkgver': '2.7.12-1ubuntu0~16.04.12'},
    {'osver': '16.04', 'pkgname': 'libpython2.7-minimal', 'pkgver': '2.7.12-1ubuntu0~16.04.12'},
    {'osver': '16.04', 'pkgname': 'libpython2.7-stdlib', 'pkgver': '2.7.12-1ubuntu0~16.04.12'},
    {'osver': '16.04', 'pkgname': 'libpython2.7-testsuite', 'pkgver': '2.7.12-1ubuntu0~16.04.12'},
    {'osver': '16.04', 'pkgname': 'libpython3.5', 'pkgver': '3.5.2-2ubuntu0~16.04.11'},
    {'osver': '16.04', 'pkgname': 'libpython3.5-dev', 'pkgver': '3.5.2-2ubuntu0~16.04.11'},
    {'osver': '16.04', 'pkgname': 'libpython3.5-minimal', 'pkgver': '3.5.2-2ubuntu0~16.04.11'},
    {'osver': '16.04', 'pkgname': 'libpython3.5-stdlib', 'pkgver': '3.5.2-2ubuntu0~16.04.11'},
    {'osver': '16.04', 'pkgname': 'libpython3.5-testsuite', 'pkgver': '3.5.2-2ubuntu0~16.04.11'},
    {'osver': '16.04', 'pkgname': 'python2.7', 'pkgver': '2.7.12-1ubuntu0~16.04.12'},
    {'osver': '16.04', 'pkgname': 'python2.7-dev', 'pkgver': '2.7.12-1ubuntu0~16.04.12'},
    {'osver': '16.04', 'pkgname': 'python2.7-examples', 'pkgver': '2.7.12-1ubuntu0~16.04.12'},
    {'osver': '16.04', 'pkgname': 'python2.7-minimal', 'pkgver': '2.7.12-1ubuntu0~16.04.12'},
    {'osver': '16.04', 'pkgname': 'python3.5', 'pkgver': '3.5.2-2ubuntu0~16.04.11'},
    {'osver': '16.04', 'pkgname': 'python3.5-dev', 'pkgver': '3.5.2-2ubuntu0~16.04.11'},
    {'osver': '16.04', 'pkgname': 'python3.5-examples', 'pkgver': '3.5.2-2ubuntu0~16.04.11'},
    {'osver': '16.04', 'pkgname': 'python3.5-minimal', 'pkgver': '3.5.2-2ubuntu0~16.04.11'},
    {'osver': '16.04', 'pkgname': 'python3.5-venv', 'pkgver': '3.5.2-2ubuntu0~16.04.11'},
    {'osver': '18.04', 'pkgname': 'idle-python2.7', 'pkgver': '2.7.17-1~18.04ubuntu1.1'},
    {'osver': '18.04', 'pkgname': 'idle-python3.6', 'pkgver': '3.6.9-1~18.04ubuntu1.1'},
    {'osver': '18.04', 'pkgname': 'libpython2.7', 'pkgver': '2.7.17-1~18.04ubuntu1.1'},
    {'osver': '18.04', 'pkgname': 'libpython2.7-dev', 'pkgver': '2.7.17-1~18.04ubuntu1.1'},
    {'osver': '18.04', 'pkgname': 'libpython2.7-minimal', 'pkgver': '2.7.17-1~18.04ubuntu1.1'},
    {'osver': '18.04', 'pkgname': 'libpython2.7-stdlib', 'pkgver': '2.7.17-1~18.04ubuntu1.1'},
    {'osver': '18.04', 'pkgname': 'libpython2.7-testsuite', 'pkgver': '2.7.17-1~18.04ubuntu1.1'},
    {'osver': '18.04', 'pkgname': 'libpython3.6', 'pkgver': '3.6.9-1~18.04ubuntu1.1'},
    {'osver': '18.04', 'pkgname': 'libpython3.6-dev', 'pkgver': '3.6.9-1~18.04ubuntu1.1'},
    {'osver': '18.04', 'pkgname': 'libpython3.6-minimal', 'pkgver': '3.6.9-1~18.04ubuntu1.1'},
    {'osver': '18.04', 'pkgname': 'libpython3.6-stdlib', 'pkgver': '3.6.9-1~18.04ubuntu1.1'},
    {'osver': '18.04', 'pkgname': 'libpython3.6-testsuite', 'pkgver': '3.6.9-1~18.04ubuntu1.1'},
    {'osver': '18.04', 'pkgname': 'python2.7', 'pkgver': '2.7.17-1~18.04ubuntu1.1'},
    {'osver': '18.04', 'pkgname': 'python2.7-dev', 'pkgver': '2.7.17-1~18.04ubuntu1.1'},
    {'osver': '18.04', 'pkgname': 'python2.7-examples', 'pkgver': '2.7.17-1~18.04ubuntu1.1'},
    {'osver': '18.04', 'pkgname': 'python2.7-minimal', 'pkgver': '2.7.17-1~18.04ubuntu1.1'},
    {'osver': '18.04', 'pkgname': 'python3.6', 'pkgver': '3.6.9-1~18.04ubuntu1.1'},
    {'osver': '18.04', 'pkgname': 'python3.6-dev', 'pkgver': '3.6.9-1~18.04ubuntu1.1'},
    {'osver': '18.04', 'pkgname': 'python3.6-examples', 'pkgver': '3.6.9-1~18.04ubuntu1.1'},
    {'osver': '18.04', 'pkgname': 'python3.6-minimal', 'pkgver': '3.6.9-1~18.04ubuntu1.1'},
    {'osver': '18.04', 'pkgname': 'python3.6-venv', 'pkgver': '3.6.9-1~18.04ubuntu1.1'},
    {'osver': '20.04', 'pkgname': 'idle-python3.8', 'pkgver': '3.8.2-1ubuntu1.2'},
    {'osver': '20.04', 'pkgname': 'libpython3.8', 'pkgver': '3.8.2-1ubuntu1.2'},
    {'osver': '20.04', 'pkgname': 'libpython3.8-dev', 'pkgver': '3.8.2-1ubuntu1.2'},
    {'osver': '20.04', 'pkgname': 'libpython3.8-minimal', 'pkgver': '3.8.2-1ubuntu1.2'},
    {'osver': '20.04', 'pkgname': 'libpython3.8-stdlib', 'pkgver': '3.8.2-1ubuntu1.2'},
    {'osver': '20.04', 'pkgname': 'libpython3.8-testsuite', 'pkgver': '3.8.2-1ubuntu1.2'},
    {'osver': '20.04', 'pkgname': 'python3.8', 'pkgver': '3.8.2-1ubuntu1.2'},
    {'osver': '20.04', 'pkgname': 'python3.8-dev', 'pkgver': '3.8.2-1ubuntu1.2'},
    {'osver': '20.04', 'pkgname': 'python3.8-examples', 'pkgver': '3.8.2-1ubuntu1.2'},
    {'osver': '20.04', 'pkgname': 'python3.8-minimal', 'pkgver': '3.8.2-1ubuntu1.2'},
    {'osver': '20.04', 'pkgname': 'python3.8-venv', 'pkgver': '3.8.2-1ubuntu1.2'}
];

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, 'idle-python2.7 / idle-python3.5 / idle-python3.6 / idle-python3.8 / etc');
}