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nessusUbuntu Security Notice (C) 2016-2020 Canonical, Inc. / NASL script (C) 2016-2019 and is owned by Tenable, Inc. or an Affiliate thereof.UBUNTU_USN-2892-1.NASL
HistoryFeb 10, 2016 - 12:00 a.m.

Ubuntu 14.04 LTS : nginx vulnerabilities (USN-2892-1)

2016-02-1000:00:00
Ubuntu Security Notice (C) 2016-2020 Canonical, Inc. / NASL script (C) 2016-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
www.tenable.com
17

It was discovered that nginx incorrectly handled certain DNS server responses when the resolver is enabled. A remote attacker could possibly use this issue to cause nginx to crash, resulting in a denial of service. (CVE-2016-0742)

It was discovered that nginx incorrectly handled CNAME response processing when the resolver is enabled. A remote attacker could use this issue to cause nginx to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2016-0746)

It was discovered that nginx incorrectly handled CNAME resolution when the resolver is enabled. A remote attacker could possibly use this issue to cause nginx to consume resources, resulting in a denial of service. (CVE-2016-0747).

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.

#%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-2892-1. The text 
# itself is copyright (C) Canonical, Inc. See 
# <http://www.ubuntu.com/usn/>. Ubuntu(R) is a registered 
# trademark of Canonical, Inc.
#

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

if (description)
{
  script_id(88678);
  script_version("2.15");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/10/20");

  script_cve_id("CVE-2016-0742", "CVE-2016-0746", "CVE-2016-0747");
  script_xref(name:"USN", value:"2892-1");

  script_name(english:"Ubuntu 14.04 LTS : nginx vulnerabilities (USN-2892-1)");

  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 nginx incorrectly handled certain DNS server
responses when the resolver is enabled. A remote attacker could
possibly use this issue to cause nginx to crash, resulting in a denial
of service. (CVE-2016-0742)

It was discovered that nginx incorrectly handled CNAME response
processing when the resolver is enabled. A remote attacker could use
this issue to cause nginx to crash, resulting in a denial of service,
or possibly execute arbitrary code. (CVE-2016-0746)

It was discovered that nginx incorrectly handled CNAME resolution when
the resolver is enabled. A remote attacker could possibly use this
issue to cause nginx to consume resources, resulting in a denial of
service. (CVE-2016-0747).

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-2892-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2016-0746");

  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:"2016/02/15");
  script_set_attribute(attribute:"patch_publication_date", value:"2016/02/09");
  script_set_attribute(attribute:"plugin_publication_date", value:"2016/02/10");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:nginx-core");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:nginx-extras");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:nginx-full");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:nginx-light");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:nginx-naxsi");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:nginx-naxsi-ui");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:14.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:nginx");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:nginx-common");
  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) 2016-2020 Canonical, Inc. / NASL script (C) 2016-2019 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 (! ('14.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 14.04', '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': '14.04', 'pkgname': 'nginx', 'pkgver': '1.4.6-1ubuntu3.4'},
    {'osver': '14.04', 'pkgname': 'nginx-common', 'pkgver': '1.4.6-1ubuntu3.4'},
    {'osver': '14.04', 'pkgname': 'nginx-core', 'pkgver': '1.4.6-1ubuntu3.4'},
    {'osver': '14.04', 'pkgname': 'nginx-extras', 'pkgver': '1.4.6-1ubuntu3.4'},
    {'osver': '14.04', 'pkgname': 'nginx-full', 'pkgver': '1.4.6-1ubuntu3.4'},
    {'osver': '14.04', 'pkgname': 'nginx-light', 'pkgver': '1.4.6-1ubuntu3.4'},
    {'osver': '14.04', 'pkgname': 'nginx-naxsi', 'pkgver': '1.4.6-1ubuntu3.4'},
    {'osver': '14.04', 'pkgname': 'nginx-naxsi-ui', 'pkgver': '1.4.6-1ubuntu3.4'}
];

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_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, 'nginx / nginx-common / nginx-core / nginx-extras / nginx-full / etc');
}
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