Ubuntu 14.04 LTS / 16.04 LTS : Squid vulnerabilities (USN-2995-1)

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-2995-1. 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(91558);
  script_version("2.12");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/09/03");

  script_cve_id(
    "CVE-2016-3947",
    "CVE-2016-4051",
    "CVE-2016-4052",
    "CVE-2016-4053",
    "CVE-2016-4054",
    "CVE-2016-4553",
    "CVE-2016-4554",
    "CVE-2016-4555",
    "CVE-2016-4556"
  );
  script_xref(name:"USN", value:"2995-1");

  script_name(english:"Ubuntu 14.04 LTS / 16.04 LTS : Squid vulnerabilities (USN-2995-1)");

  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 host has packages installed that are affected by multiple vulnerabilities as
referenced in the USN-2995-1 advisory.

    Yuriy M. Kaminskiy discovered that the Squid pinger utility incorrectly handled certain ICMPv6 packets. A
    remote attacker could use this issue to cause Squid to crash, resulting in a denial of service, or
    possibly cause Squid to leak information into log files. (CVE-2016-3947)

    Yuriy M. Kaminskiy discovered that the Squid cachemgr.cgi tool incorrectly handled certain crafted data. A
    remote attacker could use this issue to cause Squid to crash, resulting in a denial of service, or
    possibly execute arbitrary code. (CVE-2016-4051)

    It was discovered that Squid incorrectly handled certain Edge Side Includes (ESI) responses. A remote
    attacker could possibly use this issue to cause Squid to crash, resulting in a denial of service, or
    possibly execute arbitrary code. (CVE-2016-4052, CVE-2016-4053, CVE-2016-4054)

    Jianjun Chen discovered that Squid did not correctly ignore the Host header when absolute-URI is provided.
    A remote attacker could possibly use this issue to conduct cache-poisoning attacks. This issue only
    affected Ubuntu 14.04 LTS, Ubuntu 15.10 and Ubuntu 16.04 LTS. (CVE-2016-4553)

    Jianjun Chen discovered that Squid incorrectly handled certain HTTP Host headers. A remote attacker could
    possibly use this issue to conduct cache-poisoning attacks. (CVE-2016-4554)

    It was discovered that Squid incorrectly handled certain Edge Side Includes (ESI) responses. A remote
    attacker could possibly use this issue to cause Squid to crash, resulting in a denial of service.
    (CVE-2016-4555, CVE-2016-4556)

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-2995-1");
  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:R/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-2016-3947");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2016-4051");

  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:"2016/04/07");
  script_set_attribute(attribute:"patch_publication_date", value:"2016/06/09");
  script_set_attribute(attribute:"plugin_publication_date", value:"2016/06/10");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:squid-cgi");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:squid-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:squid-purge");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:squid3");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:squid3-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:squidclient");
  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:"p-cpe:/a:canonical:ubuntu_linux:squid");
  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) 2016-2025 Canonical, Inc. / NASL script (C) 2016-2025 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)) audit(AUDIT_OS_NOT, 'Ubuntu 14.04 / 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': '14.04', 'pkgname': 'squid', 'pkgver': '3.3.8-1ubuntu6.8', 'cves': ['CVE-2016-3947', 'CVE-2016-4051', 'CVE-2016-4052', 'CVE-2016-4053', 'CVE-2016-4054', 'CVE-2016-4553', 'CVE-2016-4554', 'CVE-2016-4555', 'CVE-2016-4556']},
    {'osver': '14.04', 'pkgname': 'squid-cgi', 'pkgver': '3.3.8-1ubuntu6.8', 'cves': ['CVE-2016-3947', 'CVE-2016-4051', 'CVE-2016-4052', 'CVE-2016-4053', 'CVE-2016-4054', 'CVE-2016-4553', 'CVE-2016-4554', 'CVE-2016-4555', 'CVE-2016-4556']},
    {'osver': '14.04', 'pkgname': 'squid-purge', 'pkgver': '3.3.8-1ubuntu6.8', 'cves': ['CVE-2016-3947', 'CVE-2016-4051', 'CVE-2016-4052', 'CVE-2016-4053', 'CVE-2016-4054', 'CVE-2016-4553', 'CVE-2016-4554', 'CVE-2016-4555', 'CVE-2016-4556']},
    {'osver': '14.04', 'pkgname': 'squid3', 'pkgver': '3.3.8-1ubuntu6.8', 'cves': ['CVE-2016-3947', 'CVE-2016-4051', 'CVE-2016-4052', 'CVE-2016-4053', 'CVE-2016-4054', 'CVE-2016-4553', 'CVE-2016-4554', 'CVE-2016-4555', 'CVE-2016-4556']},
    {'osver': '14.04', 'pkgname': 'squid3-common', 'pkgver': '3.3.8-1ubuntu6.8', 'cves': ['CVE-2016-3947', 'CVE-2016-4051', 'CVE-2016-4052', 'CVE-2016-4053', 'CVE-2016-4054', 'CVE-2016-4553', 'CVE-2016-4554', 'CVE-2016-4555', 'CVE-2016-4556']},
    {'osver': '14.04', 'pkgname': 'squidclient', 'pkgver': '3.3.8-1ubuntu6.8', 'cves': ['CVE-2016-3947', 'CVE-2016-4051', 'CVE-2016-4052', 'CVE-2016-4053', 'CVE-2016-4054', 'CVE-2016-4553', 'CVE-2016-4554', 'CVE-2016-4555', 'CVE-2016-4556']},
    {'osver': '16.04', 'pkgname': 'squid', 'pkgver': '3.5.12-1ubuntu7.2', 'cves': ['CVE-2016-3947', 'CVE-2016-4051', 'CVE-2016-4052', 'CVE-2016-4053', 'CVE-2016-4054', 'CVE-2016-4553', 'CVE-2016-4554', 'CVE-2016-4555', 'CVE-2016-4556']},
    {'osver': '16.04', 'pkgname': 'squid-cgi', 'pkgver': '3.5.12-1ubuntu7.2', 'cves': ['CVE-2016-3947', 'CVE-2016-4051', 'CVE-2016-4052', 'CVE-2016-4053', 'CVE-2016-4054', 'CVE-2016-4553', 'CVE-2016-4554', 'CVE-2016-4555', 'CVE-2016-4556']},
    {'osver': '16.04', 'pkgname': 'squid-common', 'pkgver': '3.5.12-1ubuntu7.2', 'cves': ['CVE-2016-3947', 'CVE-2016-4051', 'CVE-2016-4052', 'CVE-2016-4053', 'CVE-2016-4054', 'CVE-2016-4553', 'CVE-2016-4554', 'CVE-2016-4555', 'CVE-2016-4556']},
    {'osver': '16.04', 'pkgname': 'squid-purge', 'pkgver': '3.5.12-1ubuntu7.2', 'cves': ['CVE-2016-3947', 'CVE-2016-4051', 'CVE-2016-4052', 'CVE-2016-4053', 'CVE-2016-4054', 'CVE-2016-4553', 'CVE-2016-4554', 'CVE-2016-4555', 'CVE-2016-4556']},
    {'osver': '16.04', 'pkgname': 'squid3', 'pkgver': '3.5.12-1ubuntu7.2', 'cves': ['CVE-2016-3947', 'CVE-2016-4051', 'CVE-2016-4052', 'CVE-2016-4053', 'CVE-2016-4054', 'CVE-2016-4553', 'CVE-2016-4554', 'CVE-2016-4555', 'CVE-2016-4556']},
    {'osver': '16.04', 'pkgname': 'squidclient', 'pkgver': '3.5.12-1ubuntu7.2', 'cves': ['CVE-2016-3947', 'CVE-2016-4051', 'CVE-2016-4052', 'CVE-2016-4053', 'CVE-2016-4054', 'CVE-2016-4553', 'CVE-2016-4554', 'CVE-2016-4555', 'CVE-2016-4556']}
];

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 (!empty_or_null(package_array['cves'])) cves = package_array['cves'];
  if (osver && pkgname && pkgver) {
    if (deb_check(release:osver, prefix:pkgname, reference:pkgver, cves:cves)) 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, 'squid / squid-cgi / squid-common / squid-purge / squid3 / etc');
}