Vulnerabilities > CVE-2015-6817 - Improper Authentication vulnerability in Pgbouncer 1.6

#
# (C) Tenable Network Security, Inc.
#

include("compat.inc");

if (description)
{
  script_id(93006);
  script_version("1.6");
  script_cvs_date("Date: 2019/11/19");

  script_cve_id("CVE-2015-6817");

  script_name(english:"Pgbouncer 1.6 Invalid User Authentication Bypass");
  script_summary(english:"Attempts to log in through Pgbouncer using a random user name.");

  script_set_attribute(attribute:"synopsis", value:
"The remote database connection pooler is affected by an
authentication bypass vulnerability.");
  script_set_attribute(attribute:"description", value:
"The version of Pgbouncer running on the remote host is affected by an
authentication bypass vulnerability due to a flaw in the
start_auth_request() function within file client.c when handling
requests for invalid users. A remote attacker can exploit this issue
to bypass authentication and log into PostgreSQL via Pgbouncer using a
random user name.");
  script_set_attribute(attribute:"see_also", value:"https://seclists.org/oss-sec/2015/q3/495");
  script_set_attribute(attribute:"see_also", value:"https://github.com/pgbouncer/pgbouncer/issues/69");
  # https://web.archive.org/web/20150911232806/http://comments.gmane.org/gmane.comp.db.postgresql.pgbouncer.general/1251
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?342233a3");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Pgbouncer version 1.6.1 or later. Alternatively, disable
'auth_user' in the Pgbouncer configuration.");
  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:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2015-6817");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"vuln_publication_date", value:"2015/08/27");
  script_set_attribute(attribute:"patch_publication_date", value:"2015/09/03");
  script_set_attribute(attribute:"plugin_publication_date", value:"2016/08/17");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"x-cpe:/a:pgbouncer:pgbouncer");
  script_end_attributes();

  script_category(ACT_ATTACK);
  script_family(english:"Misc.");

  script_copyright(english:"This script is Copyright (C) 2016-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("pgbouncer_detect.nbin");
  script_exclude_keys("global_settings/supplied_logins_only");
  script_require_ports("Services/pgbouncer", 5432, 6432);

  exit(0);
}

include("audit.inc");
include("global_settings.inc");
include("misc_func.inc");
include("pgbouncer_func.inc");

app = 'pgbouncer';
port = get_service(svc:"pgbouncer", exit_on_fail:TRUE);

if (!get_port_state(port)) audit(AUDIT_NOT_LISTEN, app, port);

if (supplied_logins_only) audit(AUDIT_SUPPLIED_LOGINS_ONLY);

user = rand_str(length:16); # generate random user name
res = pgbouncer_login(port:port, user:user, database:'postgres');

# look for indication of successful login
if (!empty_or_null(res) &&
    "server_version" >< res &&
    "is_superuser" >< res &&
    "application_name" >< res
  )
{
  report =
    '\n  Nessus was able to log into PostgreSQL via Pgbouncer using' +
    '\n  the following randomly generated user name:' +
    '\n    ' + user;
  security_report_v4(port:port, severity:SECURITY_WARNING, extra:report);
  exit(0);
}
else audit(AUDIT_LISTEN_NOT_VULN, app, port);

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from the FreeBSD VuXML database :
#
# Copyright 2003-2018 Jacques Vidrine and contributors
#
# Redistribution and use in source (VuXML) and 'compiled' forms (SGML,
# HTML, PDF, PostScript, RTF and so forth) with or without modification,
# are permitted provided that the following conditions are met:
# 1. Redistributions of source code (VuXML) must retain the above
#    copyright notice, this list of conditions and the following
#    disclaimer as the first lines of this file unmodified.
# 2. Redistributions in compiled form (transformed to other DTDs,
#    published online in any format, converted to PDF, PostScript,
#    RTF and other formats) must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer
#    in the documentation and/or other materials provided with the
#    distribution.
# 
# THIS DOCUMENTATION IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
# THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
# OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
# OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
# BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
# OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS DOCUMENTATION,
# EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#

include("compat.inc");

if (description)
{
  script_id(85894);
  script_version("2.5");
  script_cvs_date("Date: 2018/11/23 12:49:57");

  script_cve_id("CVE-2015-6817");

  script_name(english:"FreeBSD : pgbouncer -- failed auth_query lookup leads to connection as auth_user (d76961da-56f6-11e5-934b-002590263bf5)");
  script_summary(english:"Checks for updated package in pkg_info output");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote FreeBSD host is missing a security-related update."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"PgBouncer reports :

New auth_user functionality introduced in 1.6 allows login as
auth_user when client presents unknown username. It's quite likely
auth_user is superuser. Affects only setups that have enabled
auth_user in their config."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://pgbouncer.github.io/2015/09/pgbouncer-1-6-1/"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://github.com/pgbouncer/pgbouncer/issues/69"
  );
  # http://www.openwall.com/lists/oss-security/2015/09/04/3
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.openwall.com/lists/oss-security/2015/09/04/3"
  );
  # https://vuxml.freebsd.org/freebsd/d76961da-56f6-11e5-934b-002590263bf5.html
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?81940f79"
  );
  script_set_attribute(attribute:"solution", value:"Update the affected package.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:freebsd:freebsd:pgbouncer");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:freebsd:freebsd");

  script_set_attribute(attribute:"vuln_publication_date", value:"2015/09/03");
  script_set_attribute(attribute:"patch_publication_date", value:"2015/09/09");
  script_set_attribute(attribute:"plugin_publication_date", value:"2015/09/10");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2015-2018 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"FreeBSD Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/FreeBSD/release", "Host/FreeBSD/pkg_info");

  exit(0);
}


include("audit.inc");
include("freebsd_package.inc");


if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/FreeBSD/release")) audit(AUDIT_OS_NOT, "FreeBSD");
if (!get_kb_item("Host/FreeBSD/pkg_info")) audit(AUDIT_PACKAGE_LIST_MISSING);


flag = 0;

if (pkg_test(save_report:TRUE, pkg:"pgbouncer=1.6.0")) flag++;

if (flag)
{
  if (report_verbosity > 0) security_warning(port:0, extra:pkg_report_get());
  else security_warning(0);
  exit(0);
}
else audit(AUDIT_HOST_NOT, "affected");

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Gentoo Linux Security Advisory GLSA 201701-24.
#
# The advisory text is Copyright (C) 2001-2018 Gentoo Foundation, Inc.
# and licensed under the Creative Commons - Attribution / Share Alike 
# license. See http://creativecommons.org/licenses/by-sa/3.0/
#

include("compat.inc");

if (description)
{
  script_id(96418);
  script_version("$Revision: 3.4 $");
  script_cvs_date("$Date: 2018/01/26 17:15:57 $");

  script_cve_id("CVE-2015-4054", "CVE-2015-6817");
  script_xref(name:"GLSA", value:"201701-24");

  script_name(english:"GLSA-201701-24 : PgBouncer: Multiple vulnerabilities");
  script_summary(english:"Checks for updated package(s) in /var/db/pkg");

  script_set_attribute(
    attribute:"synopsis", 
    value:
"The remote Gentoo host is missing one or more security-related
patches."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"The remote host is affected by the vulnerability described in GLSA-201701-24
(PgBouncer: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in PgBouncer. Please
      review the CVE identifiers referenced below for details.
  
Impact :

    A remote attacker might send a specially crafted package possibly
      resulting in a Denial of Service condition. Furthermore, a remote
      attacker might bypass authentication in configurations using the
      “auth_user” feature.
  
Workaround :

    There is no known workaround at this time."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security.gentoo.org/glsa/201701-24"
  );
  script_set_attribute(
    attribute:"solution", 
    value:
"All PgBouncer users should upgrade to the latest version:
      # emerge --sync
      # emerge --ask --oneshot --verbose '>=dev-db/pgbouncer-1.7.2'"
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:gentoo:linux:pgbouncer");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:gentoo:linux");

  script_set_attribute(attribute:"patch_publication_date", value:"2017/01/11");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/01/12");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2017-2018 Tenable Network Security, Inc.");
  script_family(english:"Gentoo Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/Gentoo/release", "Host/Gentoo/qpkg-list");

  exit(0);
}


include("audit.inc");
include("global_settings.inc");
include("qpkg.inc");

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/Gentoo/release")) audit(AUDIT_OS_NOT, "Gentoo");
if (!get_kb_item("Host/Gentoo/qpkg-list")) audit(AUDIT_PACKAGE_LIST_MISSING);


flag = 0;

if (qpkg_check(package:"dev-db/pgbouncer", unaffected:make_list("ge 1.7.2"), vulnerable:make_list("lt 1.7.2"))) flag++;

if (flag)
{
  if (report_verbosity > 0) security_warning(port:0, extra:qpkg_report_get());
  else security_warning(0);
  exit(0);
}
else
{
  tested = qpkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "PgBouncer");
}