Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS : BusyBox vulnerabilities (USN-3935-1)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-3935-1. 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(123751);
  script_version("1.7");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/08/27");

  script_cve_id(
    "CVE-2011-5325",
    "CVE-2014-9645",
    "CVE-2015-9261",
    "CVE-2016-2147",
    "CVE-2016-2148",
    "CVE-2017-15873",
    "CVE-2017-16544",
    "CVE-2018-1000517",
    "CVE-2018-20679",
    "CVE-2019-5747"
  );
  script_xref(name:"USN", value:"3935-1");

  script_name(english:"Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS : BusyBox vulnerabilities (USN-3935-1)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Ubuntu host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The remote Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS host has packages installed that are affected by multiple
vulnerabilities as referenced in the USN-3935-1 advisory.

    Tyler Hicks discovered that BusyBox incorrectly handled symlinks inside tar archives. If a user or
    automated system were tricked into processing a specially crafted tar archive, a remote attacker could
    overwrite arbitrary files outside of the current directory. This issue only affected Ubuntu 14.04 LTS and
    Ubuntu 16.04 LTS. (CVE-2011-5325)

    Mathias Krause discovered that BusyBox incorrectly handled kernel module loading restrictions. A local
    attacker could possibly use this issue to bypass intended restrictions. This issue only affected Ubuntu
    14.04 LTS. (CVE-2014-9645)

    It was discovered that BusyBox incorrectly handled certain ZIP archives. If a user or automated system
    were tricked into processing a specially crafted ZIP archive, a remote attacker could cause BusyBox to
    crash, leading to a denial of service. This issue only affected Ubuntu 14.04 LTS and Ubuntu 16.04 LTS.
    (CVE-2015-9261)

    Nico Golde discovered that the BusyBox DHCP client incorrectly handled certain malformed domain names. A
    remote attacker could possibly use this issue to cause the DHCP client to crash, leading to a denial of
    service. This issue only affected Ubuntu 14.04 LTS and Ubuntu 16.04 LTS. (CVE-2016-2147)

    Nico Golde discovered that the BusyBox DHCP client incorrectly handled certain 6RD options. A remote
    attacker could use this issue to cause the DHCP client to crash, leading to a denial of service, or
    possibly execute arbitrary code. This issue only affected Ubuntu 14.04 LTS and Ubuntu 16.04 LTS.
    (CVE-2016-2148)

    It was discovered that BusyBox incorrectly handled certain bzip2 archives. If a user or automated system
    were tricked into processing a specially crafted bzip2 archive, a remote attacker could cause BusyBox to
    crash, leading to a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu
    14.04 LTS and Ubuntu 16.04 LTS. (CVE-2017-15873)

    It was discovered that BusyBox incorrectly handled tab completion. A local attacker could possibly use
    this issue to execute arbitrary code. This issue only affected Ubuntu 14.04 LTS and Ubuntu 16.04 LTS.
    (CVE-2017-16544)

    It was discovered that the BusyBox wget utility incorrectly handled certain responses. A remote attacker
    could use this issue to cause BusyBox to crash, resulting in a denial of service, or possibly execute
    arbitrary code. (CVE-2018-1000517)

    It was discovered that the BusyBox DHCP utilities incorrectly handled certain memory operations. A remote
    attacker could possibly use this issue to access sensitive information. (CVE-2018-20679, CVE-2019-5747)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues 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-3935-1");
  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:POC/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:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2018-1000517");

  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:"2017/02/09");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/04/03");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/04/04");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:busybox");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:busybox-initramfs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:busybox-static");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:busybox-syslogd");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:busybox-udeb");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:udhcpc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:udhcpd");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:14.04:-:lts");
  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:"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) 2019-2024 Canonical, Inc. / NASL script (C) 2019-2024 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 || '16.04' >< os_release || '18.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 14.04 / 16.04 / 18.04', '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': 'busybox', 'pkgver': '1:1.21.0-1ubuntu1.4'},
    {'osver': '14.04', 'pkgname': 'busybox-initramfs', 'pkgver': '1:1.21.0-1ubuntu1.4'},
    {'osver': '14.04', 'pkgname': 'busybox-static', 'pkgver': '1:1.21.0-1ubuntu1.4'},
    {'osver': '14.04', 'pkgname': 'busybox-syslogd', 'pkgver': '1:1.21.0-1ubuntu1.4'},
    {'osver': '14.04', 'pkgname': 'busybox-udeb', 'pkgver': '1:1.21.0-1ubuntu1.4'},
    {'osver': '14.04', 'pkgname': 'udhcpc', 'pkgver': '1:1.21.0-1ubuntu1.4'},
    {'osver': '14.04', 'pkgname': 'udhcpd', 'pkgver': '1:1.21.0-1ubuntu1.4'},
    {'osver': '16.04', 'pkgname': 'busybox', 'pkgver': '1:1.22.0-15ubuntu1.4'},
    {'osver': '16.04', 'pkgname': 'busybox-initramfs', 'pkgver': '1:1.22.0-15ubuntu1.4'},
    {'osver': '16.04', 'pkgname': 'busybox-static', 'pkgver': '1:1.22.0-15ubuntu1.4'},
    {'osver': '16.04', 'pkgname': 'busybox-syslogd', 'pkgver': '1:1.22.0-15ubuntu1.4'},
    {'osver': '16.04', 'pkgname': 'busybox-udeb', 'pkgver': '1:1.22.0-15ubuntu1.4'},
    {'osver': '16.04', 'pkgname': 'udhcpc', 'pkgver': '1:1.22.0-15ubuntu1.4'},
    {'osver': '16.04', 'pkgname': 'udhcpd', 'pkgver': '1:1.22.0-15ubuntu1.4'},
    {'osver': '18.04', 'pkgname': 'busybox', 'pkgver': '1:1.27.2-2ubuntu3.2'},
    {'osver': '18.04', 'pkgname': 'busybox-initramfs', 'pkgver': '1:1.27.2-2ubuntu3.2'},
    {'osver': '18.04', 'pkgname': 'busybox-static', 'pkgver': '1:1.27.2-2ubuntu3.2'},
    {'osver': '18.04', 'pkgname': 'busybox-syslogd', 'pkgver': '1:1.27.2-2ubuntu3.2'},
    {'osver': '18.04', 'pkgname': 'busybox-udeb', 'pkgver': '1:1.27.2-2ubuntu3.2'},
    {'osver': '18.04', 'pkgname': 'udhcpc', 'pkgver': '1:1.27.2-2ubuntu3.2'},
    {'osver': '18.04', 'pkgname': 'udhcpd', 'pkgver': '1:1.27.2-2ubuntu3.2'}
];

var flag = 0;
foreach var 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)
{
  var extra = '';
  extra += ubuntu_report_get();
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : extra
  );
  exit(0);
}
else
{
  var tested = ubuntu_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'busybox / busybox-initramfs / busybox-static / busybox-syslogd / etc');
}