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nessusUbuntu Security Notice (C) 2022-2023 Canonical, Inc. / NASL script (C) 2022-2023 and is owned by Tenable, Inc. or an Affiliate thereof.UBUNTU_USN-5767-2.NASL
HistoryDec 08, 2022 - 12:00 a.m.

Ubuntu 16.04 ESM : Python vulnerability (USN-5767-2)

2022-12-0800:00:00
Ubuntu Security Notice (C) 2022-2023 Canonical, Inc. / NASL script (C) 2022-2023 and is owned by Tenable, Inc. or an Affiliate thereof.
www.tenable.com
15

7.5 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

0.007 Low

EPSS

Percentile

79.6%

The remote Ubuntu 16.04 ESM host has packages installed that are affected by a vulnerability as referenced in the USN-5767-2 advisory.

  • An issue was discovered in Python before 3.11.1. An unnecessary quadratic algorithm exists in one path when processing some inputs to the IDNA (RFC 3490) decoder, such that a crafted, unreasonably long name being presented to the decoder could lead to a CPU denial of service. Hostnames are often supplied by remote servers that could be controlled by a malicious actor; in such a scenario, they could trigger excessive CPU consumption on the client attempting to make use of an attacker-supplied supposed hostname.
    For example, the attack payload could be placed in the Location header of an HTTP response with status code 302. A fix is planned in 3.11.1, 3.10.9, 3.9.16, 3.8.16, and 3.7.16. (CVE-2022-45061)

Note that Nessus has not tested for this issue but has instead relied only on the application’s self-reported version number.

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-5767-2. 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(168534);
  script_version("1.8");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/09/29");

  script_cve_id("CVE-2022-45061");
  script_xref(name:"USN", value:"5767-2");
  script_xref(name:"IAVA", value:"2023-A-0061-S");

  script_name(english:"Ubuntu 16.04 ESM : Python vulnerability (USN-5767-2)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Ubuntu host is missing a security update.");
  script_set_attribute(attribute:"description", value:
"The remote Ubuntu 16.04 ESM host has packages installed that are affected by a vulnerability as referenced in the
USN-5767-2 advisory.

  - An issue was discovered in Python before 3.11.1. An unnecessary quadratic algorithm exists in one path
    when processing some inputs to the IDNA (RFC 3490) decoder, such that a crafted, unreasonably long name
    being presented to the decoder could lead to a CPU denial of service. Hostnames are often supplied by
    remote servers that could be controlled by a malicious actor; in such a scenario, they could trigger
    excessive CPU consumption on the client attempting to make use of an attacker-supplied supposed hostname.
    For example, the attack payload could be placed in the Location header of an HTTP response with status
    code 302. A fix is planned in 3.11.1, 3.10.9, 3.9.16, 3.8.16, and 3.7.16. (CVE-2022-45061)

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-5767-2");
  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:N/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:N/UI:N/S:U/C:N/I:N/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-2022-45061");

  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:"2022/11/09");
  script_set_attribute(attribute:"patch_publication_date", value:"2022/12/08");
  script_set_attribute(attribute:"plugin_publication_date", value:"2022/12/08");

  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:"p-cpe:/a:canonical:ubuntu_linux:idle-python2.7");
  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: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:libpython3.5");
  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: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:python3.5");
  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:"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) 2022-2023 Canonical, Inc. / NASL script (C) 2022-2023 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)) audit(AUDIT_OS_NOT, 'Ubuntu 16.04', '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': '2.7.12-1ubuntu0~16.04.18+esm3'},
    {'osver': '16.04', 'pkgname': 'idle-python3.5', 'pkgver': '3.5.2-2ubuntu0~16.04.13+esm6'},
    {'osver': '16.04', 'pkgname': 'libpython2.7', 'pkgver': '2.7.12-1ubuntu0~16.04.18+esm3'},
    {'osver': '16.04', 'pkgname': 'libpython2.7-dev', 'pkgver': '2.7.12-1ubuntu0~16.04.18+esm3'},
    {'osver': '16.04', 'pkgname': 'libpython2.7-minimal', 'pkgver': '2.7.12-1ubuntu0~16.04.18+esm3'},
    {'osver': '16.04', 'pkgname': 'libpython2.7-stdlib', 'pkgver': '2.7.12-1ubuntu0~16.04.18+esm3'},
    {'osver': '16.04', 'pkgname': 'libpython2.7-testsuite', 'pkgver': '2.7.12-1ubuntu0~16.04.18+esm3'},
    {'osver': '16.04', 'pkgname': 'libpython3.5', 'pkgver': '3.5.2-2ubuntu0~16.04.13+esm6'},
    {'osver': '16.04', 'pkgname': 'libpython3.5-dev', 'pkgver': '3.5.2-2ubuntu0~16.04.13+esm6'},
    {'osver': '16.04', 'pkgname': 'libpython3.5-minimal', 'pkgver': '3.5.2-2ubuntu0~16.04.13+esm6'},
    {'osver': '16.04', 'pkgname': 'libpython3.5-stdlib', 'pkgver': '3.5.2-2ubuntu0~16.04.13+esm6'},
    {'osver': '16.04', 'pkgname': 'libpython3.5-testsuite', 'pkgver': '3.5.2-2ubuntu0~16.04.13+esm6'},
    {'osver': '16.04', 'pkgname': 'python2.7', 'pkgver': '2.7.12-1ubuntu0~16.04.18+esm3'},
    {'osver': '16.04', 'pkgname': 'python2.7-dev', 'pkgver': '2.7.12-1ubuntu0~16.04.18+esm3'},
    {'osver': '16.04', 'pkgname': 'python2.7-examples', 'pkgver': '2.7.12-1ubuntu0~16.04.18+esm3'},
    {'osver': '16.04', 'pkgname': 'python2.7-minimal', 'pkgver': '2.7.12-1ubuntu0~16.04.18+esm3'},
    {'osver': '16.04', 'pkgname': 'python3.5', 'pkgver': '3.5.2-2ubuntu0~16.04.13+esm6'},
    {'osver': '16.04', 'pkgname': 'python3.5-dev', 'pkgver': '3.5.2-2ubuntu0~16.04.13+esm6'},
    {'osver': '16.04', 'pkgname': 'python3.5-examples', 'pkgver': '3.5.2-2ubuntu0~16.04.13+esm6'},
    {'osver': '16.04', 'pkgname': 'python3.5-minimal', 'pkgver': '3.5.2-2ubuntu0~16.04.13+esm6'},
    {'osver': '16.04', 'pkgname': 'python3.5-venv', 'pkgver': '3.5.2-2ubuntu0~16.04.13+esm6'}
];

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_HOLE,
    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 / libpython2.7 / libpython2.7-dev / etc');
}
VendorProductVersionCPE
canonicalubuntu_linux16.04cpe:/o:canonical:ubuntu_linux:16.04:-:esm
canonicalubuntu_linuxidle-python2.7p-cpe:/a:canonical:ubuntu_linux:idle-python2.7
canonicalubuntu_linuxidle-python3.5p-cpe:/a:canonical:ubuntu_linux:idle-python3.5
canonicalubuntu_linuxlibpython2.7p-cpe:/a:canonical:ubuntu_linux:libpython2.7
canonicalubuntu_linuxlibpython2.7-devp-cpe:/a:canonical:ubuntu_linux:libpython2.7-dev
canonicalubuntu_linuxlibpython2.7-minimalp-cpe:/a:canonical:ubuntu_linux:libpython2.7-minimal
canonicalubuntu_linuxlibpython2.7-stdlibp-cpe:/a:canonical:ubuntu_linux:libpython2.7-stdlib
canonicalubuntu_linuxlibpython2.7-testsuitep-cpe:/a:canonical:ubuntu_linux:libpython2.7-testsuite
canonicalubuntu_linuxlibpython3.5p-cpe:/a:canonical:ubuntu_linux:libpython3.5
canonicalubuntu_linuxlibpython3.5-devp-cpe:/a:canonical:ubuntu_linux:libpython3.5-dev
Rows per page:
1-10 of 221

7.5 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

0.007 Low

EPSS

Percentile

79.6%