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nessusUbuntu Security Notice (C) 2020-2023 Canonical, Inc. / NASL script (C) 2020-2023 and is owned by Tenable, Inc. or an Affiliate thereof.UBUNTU_USN-4417-1.NASL
HistoryJul 07, 2020 - 12:00 a.m.

Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS : NSS vulnerability (USN-4417-1)

2020-07-0700:00:00
Ubuntu Security Notice (C) 2020-2023 Canonical, Inc. / NASL script (C) 2020-2023 and is owned by Tenable, Inc. or an Affiliate thereof.
www.tenable.com
13

CVSS2

1.2

Attack Vector

LOCAL

Attack Complexity

HIGH

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

NONE

AV:L/AC:H/Au:N/C:P/I:N/A:N

CVSS3

4.4

Attack Vector

LOCAL

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

NONE

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

EPSS

0.001

Percentile

29.0%

Cesar Pereida, Billy Bob Brumley, Yuval Yarom, and Nicola Tuveri discovered that NSS incorrectly handled RSA key generation. A local attacker could possibly use this issue to perform a timing attack and recover RSA keys.

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.

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-4417-1. 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(138167);
  script_version("1.8");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/10/21");

  script_cve_id("CVE-2020-12402");
  script_xref(name:"USN", value:"4417-1");

  script_name(english:"Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS : NSS vulnerability (USN-4417-1)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Ubuntu host is missing a security update.");
  script_set_attribute(attribute:"description", value:
"Cesar Pereida, Billy Bob Brumley, Yuval Yarom, and Nicola Tuveri
discovered that NSS incorrectly handled RSA key generation. A local
attacker could possibly use this issue to perform a timing attack and
recover RSA keys.

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-4417-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:H/Au:N/C:P/I:N/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2020-12402");

  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:"2020/07/09");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/07/06");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/07/07");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libnss3");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libnss3-1d");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libnss3-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libnss3-nssdb");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libnss3-tools");
  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:"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) 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': 'libnss3', 'pkgver': '2:3.28.4-0ubuntu0.16.04.12'},
    {'osver': '16.04', 'pkgname': 'libnss3-1d', 'pkgver': '2:3.28.4-0ubuntu0.16.04.12'},
    {'osver': '16.04', 'pkgname': 'libnss3-dev', 'pkgver': '2:3.28.4-0ubuntu0.16.04.12'},
    {'osver': '16.04', 'pkgname': 'libnss3-nssdb', 'pkgver': '2:3.28.4-0ubuntu0.16.04.12'},
    {'osver': '16.04', 'pkgname': 'libnss3-tools', 'pkgver': '2:3.28.4-0ubuntu0.16.04.12'},
    {'osver': '18.04', 'pkgname': 'libnss3', 'pkgver': '2:3.35-2ubuntu2.9'},
    {'osver': '18.04', 'pkgname': 'libnss3-dev', 'pkgver': '2:3.35-2ubuntu2.9'},
    {'osver': '18.04', 'pkgname': 'libnss3-tools', 'pkgver': '2:3.35-2ubuntu2.9'},
    {'osver': '20.04', 'pkgname': 'libnss3', 'pkgver': '2:3.49.1-1ubuntu1.2'},
    {'osver': '20.04', 'pkgname': 'libnss3-dev', 'pkgver': '2:3.49.1-1ubuntu1.2'},
    {'osver': '20.04', 'pkgname': 'libnss3-tools', 'pkgver': '2:3.49.1-1ubuntu1.2'}
];

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_NOTE,
    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, 'libnss3 / libnss3-1d / libnss3-dev / libnss3-nssdb / libnss3-tools');
}
VendorProductVersionCPE
canonicalubuntu_linuxlibnss3p-cpe:/a:canonical:ubuntu_linux:libnss3
canonicalubuntu_linuxlibnss3-1dp-cpe:/a:canonical:ubuntu_linux:libnss3-1d
canonicalubuntu_linuxlibnss3-devp-cpe:/a:canonical:ubuntu_linux:libnss3-dev
canonicalubuntu_linuxlibnss3-nssdbp-cpe:/a:canonical:ubuntu_linux:libnss3-nssdb
canonicalubuntu_linuxlibnss3-toolsp-cpe:/a:canonical:ubuntu_linux:libnss3-tools
canonicalubuntu_linux16.04cpe:/o:canonical:ubuntu_linux:16.04:-:lts
canonicalubuntu_linux18.04cpe:/o:canonical:ubuntu_linux:18.04:-:lts
canonicalubuntu_linux20.04cpe:/o:canonical:ubuntu_linux:20.04:-:lts

CVSS2

1.2

Attack Vector

LOCAL

Attack Complexity

HIGH

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

NONE

AV:L/AC:H/Au:N/C:P/I:N/A:N

CVSS3

4.4

Attack Vector

LOCAL

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

NONE

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

EPSS

0.001

Percentile

29.0%