Ubuntu 10.04 LTS / 11.04 / 11.10 / 12.04 LTS : dhcp3, isc-dhcp vulnerability (USN-1571-1)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-1571-1. 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(62180);
  script_version("1.13");
  script_cvs_date("Date: 2019/09/19 12:54:28");

  script_cve_id("CVE-2012-3955");
  script_bugtraq_id(55530);
  script_xref(name:"USN", value:"1571-1");

  script_name(english:"Ubuntu 10.04 LTS / 11.04 / 11.10 / 12.04 LTS : dhcp3, isc-dhcp vulnerability (USN-1571-1)");
  script_summary(english:"Checks dpkg output for updated packages.");

  script_set_attribute(
    attribute:"synopsis", 
    value:
"The remote Ubuntu host is missing one or more security-related
patches."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"Glen Eustace discovered that the DHCP server incorrectly handled IPv6
expiration times. A remote attacker could use this issue to cause DHCP
to crash, resulting in a denial of service. This issue only affected
Ubuntu 11.04, Ubuntu 11.10 and Ubuntu 12.04 LTS. (CVE-2012-3955)

Dan Rosenberg discovered that the DHCP AppArmor profile could be
escaped by using environment variables. This update mitigates the
issue by sanitizing certain variables in the DHCP shell scripts.

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://usn.ubuntu.com/1571-1/"
  );
  script_set_attribute(attribute:"solution", value:"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:N/I:N/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:dhcp3-client");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:dhcp3-server");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:isc-dhcp-client");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:isc-dhcp-server");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:10.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:11.04");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:11.10");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:12.04:-:lts");

  script_set_attribute(attribute:"vuln_publication_date", value:"2012/09/14");
  script_set_attribute(attribute:"patch_publication_date", value:"2012/09/18");
  script_set_attribute(attribute:"plugin_publication_date", value:"2012/09/18");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"Ubuntu Security Notice (C) 2012-2019 Canonical, Inc. / NASL script (C) 2012-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"Ubuntu Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/cpu", "Host/Ubuntu", "Host/Ubuntu/release", "Host/Debian/dpkg-l");

  exit(0);
}


include("audit.inc");
include("ubuntu.inc");
include("misc_func.inc");

if ( ! get_kb_item("Host/local_checks_enabled") ) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
release = get_kb_item("Host/Ubuntu/release");
if ( isnull(release) ) audit(AUDIT_OS_NOT, "Ubuntu");
release = chomp(release);
if (! preg(pattern:"^(10\.04|11\.04|11\.10|12\.04)$", string:release)) audit(AUDIT_OS_NOT, "Ubuntu 10.04 / 11.04 / 11.10 / 12.04", "Ubuntu " + release);
if ( ! get_kb_item("Host/Debian/dpkg-l") ) audit(AUDIT_PACKAGE_LIST_MISSING);

cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Ubuntu", cpu);

flag = 0;

if (ubuntu_check(osver:"10.04", pkgname:"dhcp3-client", pkgver:"3.1.3-2ubuntu3.4")) flag++;
if (ubuntu_check(osver:"10.04", pkgname:"dhcp3-server", pkgver:"3.1.3-2ubuntu3.4")) flag++;
if (ubuntu_check(osver:"11.04", pkgname:"isc-dhcp-client", pkgver:"4.1.1-P1-15ubuntu9.6")) flag++;
if (ubuntu_check(osver:"11.04", pkgname:"isc-dhcp-server", pkgver:"4.1.1-P1-15ubuntu9.6")) flag++;
if (ubuntu_check(osver:"11.10", pkgname:"isc-dhcp-client", pkgver:"4.1.1-P1-17ubuntu10.5")) flag++;
if (ubuntu_check(osver:"11.10", pkgname:"isc-dhcp-server", pkgver:"4.1.1-P1-17ubuntu10.5")) flag++;
if (ubuntu_check(osver:"12.04", pkgname:"isc-dhcp-client", pkgver:"4.1.ESV-R4-0ubuntu5.5")) flag++;
if (ubuntu_check(osver:"12.04", pkgname:"isc-dhcp-server", pkgver:"4.1.ESV-R4-0ubuntu5.5")) flag++;

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : ubuntu_report_get()
  );
  exit(0);
}
else
{
  tested = ubuntu_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "dhcp3-client / dhcp3-server / isc-dhcp-client / isc-dhcp-server");
}