Ubuntu 12.04 LTS / 14.04 LTS / 15.10 / 16.04 LTS : samba regressions (USN-2950-3) (Badlock)

2016-05-05T00:00:00
ID UBUNTU_USN-2950-3.NASL
Type nessus
Reporter Tenable
Modified 2016-12-01T00:00:00

Description

USN-2950-1 fixed vulnerabilities in Samba. The fixes introduced in Samba 4.3.8 caused certain regressions and interoperability issues.

This update resolves some of these issues by updating to Samba 4.3.9 in Ubuntu 14.04 LTS, Ubuntu 15.10 and Ubuntu 16.04 LTS. Backported regression fixes were added to Samba 3.6.25 in Ubuntu 12.04 LTS.

This advisory was inadvertently published as USN-2950-2 originally.

Jouni Knuutinen discovered that Samba contained multiple flaws in the DCE/RPC implementation. A remote attacker could use this issue to perform a denial of service, downgrade secure connections by performing a man in the middle attack, or possibly execute arbitrary code. (CVE-2015-5370)

Stefan Metzmacher discovered that Samba contained multiple flaws in the NTLMSSP authentication implementation. A remote attacker could use this issue to downgrade connections to plain text by performing a man in the middle attack. (CVE-2016-2110)

Alberto Solino discovered that a Samba domain controller would establish a secure connection to a server with a spoofed computer name. A remote attacker could use this issue to obtain sensitive information. (CVE-2016-2111)

Stefan Metzmacher discovered that the Samba LDAP implementation did not enforce integrity protection. A remote attacker could use this issue to hijack LDAP connections by performing a man in the middle attack. (CVE-2016-2112)

Stefan Metzmacher discovered that Samba did not validate TLS certificates. A remote attacker could use this issue to spoof a Samba server. (CVE-2016-2113)

Stefan Metzmacher discovered that Samba did not enforce SMB signing even if configured to. A remote attacker could use this issue to perform a man in the middle attack. (CVE-2016-2114)

Stefan Metzmacher discovered that Samba did not enable integrity protection for IPC traffic. A remote attacker could use this issue to perform a man in the middle attack. (CVE-2016-2115)

Stefan Metzmacher discovered that Samba incorrectly handled the MS-SAMR and MS-LSAD protocols. A remote attacker could use this flaw with a man in the middle attack to impersonate users and obtain sensitive information from the Security Account Manager database. This flaw is known as Badlock. (CVE-2016-2118)

Samba has been updated to 4.3.8 in Ubuntu 14.04 LTS and Ubuntu 15.10. Ubuntu 12.04 LTS has been updated to 3.6.25 with backported security fixes.

In addition to security fixes, the updated packages contain bug fixes, new features, and possibly incompatible changes. Configuration changes may be required in certain environments.

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.

                                        
                                            #
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-2950-3. 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(90915);
  script_version("$Revision: 2.16 $");
  script_cvs_date("$Date: 2016/12/01 21:07:48 $");

  script_cve_id("CVE-2015-5370", "CVE-2016-2110", "CVE-2016-2111", "CVE-2016-2112", "CVE-2016-2113", "CVE-2016-2114", "CVE-2016-2115", "CVE-2016-2118");
  script_osvdb_id(136339, 136989, 136990, 136991, 136992, 136993, 136994, 136995);
  script_xref(name:"USN", value:"2950-3");

  script_name(english:"Ubuntu 12.04 LTS / 14.04 LTS / 15.10 / 16.04 LTS : samba regressions (USN-2950-3) (Badlock)");
  script_summary(english:"Checks dpkg output for updated package.");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote Ubuntu host is missing a security-related patch."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"USN-2950-1 fixed vulnerabilities in Samba. The fixes introduced in
Samba 4.3.8 caused certain regressions and interoperability issues.

This update resolves some of these issues by updating to Samba 4.3.9
in Ubuntu 14.04 LTS, Ubuntu 15.10 and Ubuntu 16.04 LTS. Backported
regression fixes were added to Samba 3.6.25 in Ubuntu 12.04 LTS.

This advisory was inadvertently published as USN-2950-2 originally.

Jouni Knuutinen discovered that Samba contained multiple flaws in the
DCE/RPC implementation. A remote attacker could use this issue to
perform a denial of service, downgrade secure connections by
performing a man in the middle attack, or possibly execute arbitrary
code. (CVE-2015-5370)

Stefan Metzmacher discovered that Samba contained multiple
flaws in the NTLMSSP authentication implementation. A remote
attacker could use this issue to downgrade connections to
plain text by performing a man in the middle attack.
(CVE-2016-2110)

Alberto Solino discovered that a Samba domain controller
would establish a secure connection to a server with a
spoofed computer name. A remote attacker could use this
issue to obtain sensitive information. (CVE-2016-2111)

Stefan Metzmacher discovered that the Samba LDAP
implementation did not enforce integrity protection. A
remote attacker could use this issue to hijack LDAP
connections by performing a man in the middle attack.
(CVE-2016-2112)

Stefan Metzmacher discovered that Samba did not validate TLS
certificates. A remote attacker could use this issue to
spoof a Samba server. (CVE-2016-2113)

Stefan Metzmacher discovered that Samba did not enforce SMB
signing even if configured to. A remote attacker could use
this issue to perform a man in the middle attack.
(CVE-2016-2114)

Stefan Metzmacher discovered that Samba did not enable
integrity protection for IPC traffic. A remote attacker
could use this issue to perform a man in the middle attack.
(CVE-2016-2115)

Stefan Metzmacher discovered that Samba incorrectly handled
the MS-SAMR and MS-LSAD protocols. A remote attacker could
use this flaw with a man in the middle attack to impersonate
users and obtain sensitive information from the Security
Account Manager database. This flaw is known as Badlock.
(CVE-2016-2118)

Samba has been updated to 4.3.8 in Ubuntu 14.04 LTS and
Ubuntu 15.10. Ubuntu 12.04 LTS has been updated to 3.6.25
with backported security fixes.

In addition to security fixes, the updated packages contain
bug fixes, new features, and possibly incompatible changes.
Configuration changes may be required in certain
environments.

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:"solution", value:"Update the affected samba package.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:F/RL:OF/RC:ND");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:F/RL:O/RC:X");
  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  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:"cpe:/o:canonical:ubuntu_linux:12.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:14.04");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:15.10");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:16.04");

  script_set_attribute(attribute:"patch_publication_date", value:"2016/05/04");
  script_set_attribute(attribute:"in_the_news", value:"true");
  script_set_attribute(attribute:"plugin_publication_date", value:"2016/05/05");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"Ubuntu Security Notice (C) 2016 Canonical, Inc. / NASL script (C) 2016 Tenable Network Security, Inc.");
  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 (! ereg(pattern:"^(12\.04|14\.04|15\.10|16\.04)$", string:release)) audit(AUDIT_OS_NOT, "Ubuntu 12.04 / 14.04 / 15.10 / 16.04", "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:"12.04", pkgname:"samba", pkgver:"2:3.6.25-0ubuntu0.12.04.3")) flag++;
if (ubuntu_check(osver:"14.04", pkgname:"samba", pkgver:"2:4.3.9+dfsg-0ubuntu0.14.04.1")) flag++;
if (ubuntu_check(osver:"15.10", pkgname:"samba", pkgver:"2:4.3.9+dfsg-0ubuntu0.15.10.1")) flag++;
if (ubuntu_check(osver:"16.04", pkgname:"samba", pkgver:"2:4.3.9+dfsg-0ubuntu0.16.04.1")) flag++;

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_WARNING,
    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, "samba");
}