Ubuntu 14.04 LTS : Samba vulnerabilities (USN-2855-1)

#%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-2855-1. 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(87755);
  script_version("2.16");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/08/27");

  script_cve_id(
    "CVE-2015-3223",
    "CVE-2015-5252",
    "CVE-2015-5296",
    "CVE-2015-5299",
    "CVE-2015-5330",
    "CVE-2015-7540",
    "CVE-2015-8467"
  );
  script_xref(name:"USN", value:"2855-1");

  script_name(english:"Ubuntu 14.04 LTS : Samba vulnerabilities (USN-2855-1)");

  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 host has packages installed that are affected by multiple vulnerabilities as referenced in
the USN-2855-1 advisory.

    Thilo Uttendorfer discovered that the Samba LDAP server incorrectly handled certain packets. A remote
    attacker could use this issue to cause the LDAP server to stop responding, resulting in a denial of
    service. This issue only affected Ubuntu 14.04 LTS, Ubuntu 15.04 and Ubuntu 15.10. (CVE-2015-3223)

    Jan Kasprzak discovered that Samba incorrectly handled certain symlinks. A remote attacker could use this
    issue to access files outside the exported share path. (CVE-2015-5252)

    Stefan Metzmacher discovered that Samba did not enforce signing when creating encrypted connections. If a
    remote attacker were able to perform a machine-in-the-middle attack, this flaw could be exploited to view
    sensitive information. (CVE-2015-5296)

    It was discovered that Samba incorrectly performed access control when using the VFS shadow_copy2 module.
    A remote attacker could use this issue to access snapshots, contrary to intended permissions.
    (CVE-2015-5299)

    Douglas Bagnall discovered that Samba incorrectly handled certain string lengths. A remote attacker could
    use this issue to possibly access sensitive information. (CVE-2015-5330)

    It was discovered that the Samba LDAP server incorrectly handled certain packets. A remote attacker could
    use this issue to cause the LDAP server to stop responding, resulting in a denial of service. This issue
    only affected Ubuntu 14.04 LTS, Ubuntu 15.04 and Ubuntu 15.10. (CVE-2015-7540)

    Andrew Bartlett discovered that Samba incorrectly checked administrative privileges during creation of
    machine accounts. A remote attacker could possibly use this issue to bypass intended access restrictions
    in certain environments. This issue only affected Ubuntu 14.04 LTS, Ubuntu 15.04 and Ubuntu 15.10.
    (CVE-2015-8467)

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-2855-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:S/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:H/PR:L/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-2015-8467");

  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:"2015/12/29");
  script_set_attribute(attribute:"patch_publication_date", value:"2016/01/05");
  script_set_attribute(attribute:"plugin_publication_date", value:"2016/01/06");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:samba");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:samba-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:samba-common-bin");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:samba-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:samba-dsdb-modules");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:samba-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:samba-testsuite");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:samba-vfs-modules");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:smbclient");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:winbind");
  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:libnss-winbind");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libpam-smbpass");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libpam-winbind");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libparse-pidl-perl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libsmbclient");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libsmbclient-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libsmbsharemodes-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libsmbsharemodes0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libwbclient-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libwbclient0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:python-samba");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:registry-tools");
  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': 'libnss-winbind', 'pkgver': '2:4.1.6+dfsg-1ubuntu2.14.04.11'},
    {'osver': '14.04', 'pkgname': 'libpam-smbpass', 'pkgver': '2:4.1.6+dfsg-1ubuntu2.14.04.11'},
    {'osver': '14.04', 'pkgname': 'libpam-winbind', 'pkgver': '2:4.1.6+dfsg-1ubuntu2.14.04.11'},
    {'osver': '14.04', 'pkgname': 'libparse-pidl-perl', 'pkgver': '2:4.1.6+dfsg-1ubuntu2.14.04.11'},
    {'osver': '14.04', 'pkgname': 'libsmbclient', 'pkgver': '2:4.1.6+dfsg-1ubuntu2.14.04.11'},
    {'osver': '14.04', 'pkgname': 'libsmbclient-dev', 'pkgver': '2:4.1.6+dfsg-1ubuntu2.14.04.11'},
    {'osver': '14.04', 'pkgname': 'libsmbsharemodes-dev', 'pkgver': '2:4.1.6+dfsg-1ubuntu2.14.04.11'},
    {'osver': '14.04', 'pkgname': 'libsmbsharemodes0', 'pkgver': '2:4.1.6+dfsg-1ubuntu2.14.04.11'},
    {'osver': '14.04', 'pkgname': 'libwbclient-dev', 'pkgver': '2:4.1.6+dfsg-1ubuntu2.14.04.11'},
    {'osver': '14.04', 'pkgname': 'libwbclient0', 'pkgver': '2:4.1.6+dfsg-1ubuntu2.14.04.11'},
    {'osver': '14.04', 'pkgname': 'python-samba', 'pkgver': '2:4.1.6+dfsg-1ubuntu2.14.04.11'},
    {'osver': '14.04', 'pkgname': 'registry-tools', 'pkgver': '2:4.1.6+dfsg-1ubuntu2.14.04.11'},
    {'osver': '14.04', 'pkgname': 'samba', 'pkgver': '2:4.1.6+dfsg-1ubuntu2.14.04.11'},
    {'osver': '14.04', 'pkgname': 'samba-common', 'pkgver': '2:4.1.6+dfsg-1ubuntu2.14.04.11'},
    {'osver': '14.04', 'pkgname': 'samba-common-bin', 'pkgver': '2:4.1.6+dfsg-1ubuntu2.14.04.11'},
    {'osver': '14.04', 'pkgname': 'samba-dev', 'pkgver': '2:4.1.6+dfsg-1ubuntu2.14.04.11'},
    {'osver': '14.04', 'pkgname': 'samba-dsdb-modules', 'pkgver': '2:4.1.6+dfsg-1ubuntu2.14.04.11'},
    {'osver': '14.04', 'pkgname': 'samba-libs', 'pkgver': '2:4.1.6+dfsg-1ubuntu2.14.04.11'},
    {'osver': '14.04', 'pkgname': 'samba-testsuite', 'pkgver': '2:4.1.6+dfsg-1ubuntu2.14.04.11'},
    {'osver': '14.04', 'pkgname': 'samba-vfs-modules', 'pkgver': '2:4.1.6+dfsg-1ubuntu2.14.04.11'},
    {'osver': '14.04', 'pkgname': 'smbclient', 'pkgver': '2:4.1.6+dfsg-1ubuntu2.14.04.11'},
    {'osver': '14.04', 'pkgname': 'winbind', 'pkgver': '2:4.1.6+dfsg-1ubuntu2.14.04.11'}
];

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_WARNING,
    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, 'libnss-winbind / libpam-smbpass / libpam-winbind / etc');
}