Vulnerabilities > CVE-2017-14727 - Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability in Weechat Logger

047910
CVSS 5.0 - MEDIUM
Attack vector
NETWORK
Attack complexity
LOW
Privileges required
NONE
Confidentiality impact
NONE
Integrity impact
NONE
Availability impact
PARTIAL
network
low complexity
weechat
CWE-119
nessus
NVD
Published: 2017-09-23
Updated: 2017-09-29

Summary

logger.c in the logger plugin in WeeChat before 1.9.1 allows a crash via strftime date/time specifiers, because a buffer is not initialized.

Vulnerable Configurations

Part Description Count
Application
Weechat
28

Common Weakness Enumeration (CWE)

Common Attack Pattern Enumeration and Classification (CAPEC)

  • Buffer Overflow via Environment Variables
    This attack pattern involves causing a buffer overflow through manipulation of environment variables. Once the attacker finds that they can modify an environment variable, they may try to overflow associated buffers. This attack leverages implicit trust often placed in environment variables.
  • Overflow Buffers
    Buffer Overflow attacks target improper or missing bounds checking on buffer operations, typically triggered by input injected by an attacker. As a consequence, an attacker is able to write past the boundaries of allocated buffer regions in memory, causing a program crash or potentially redirection of execution as per the attackers' choice.
  • Client-side Injection-induced Buffer Overflow
    This type of attack exploits a buffer overflow vulnerability in targeted client software through injection of malicious content from a custom-built hostile service.
  • Filter Failure through Buffer Overflow
    In this attack, the idea is to cause an active filter to fail by causing an oversized transaction. An attacker may try to feed overly long input strings to the program in an attempt to overwhelm the filter (by causing a buffer overflow) and hoping that the filter does not fail securely (i.e. the user input is let into the system unfiltered).
  • MIME Conversion
    An attacker exploits a weakness in the MIME conversion routine to cause a buffer overflow and gain control over the mail server machine. The MIME system is designed to allow various different information formats to be interpreted and sent via e-mail. Attack points exist when data are converted to MIME compatible format and back.

Nessus

  • NASL familyFreeBSD Local Security Checks
    NASL idFREEBSD_PKG_B63421B6A1E011E7AC58B499BAEBFEAF.NASL
    descriptionWeeChat reports : security problem: a crash can happen in logger plugin when converting date/time specifiers in file mask.
    last seen2020-06-01
    modified2020-06-02
    plugin id103461
    published2017-09-26
    reporterThis script is Copyright (C) 2017-2018 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/103461
    titleFreeBSD : weechat -- crash in logger plugin (b63421b6-a1e0-11e7-ac58-b499baebfeaf)
    code
    #
# (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(103461);
  script_version("3.4");
  script_cvs_date("Date: 2018/11/10 11:49:46");

  script_cve_id("CVE-2017-14727");

  script_name(english:"FreeBSD : weechat -- crash in logger plugin (b63421b6-a1e0-11e7-ac58-b499baebfeaf)");
  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:
"WeeChat reports :

security problem: a crash can happen in logger plugin when converting
date/time specifiers in file mask."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://weechat.org/news/98/20170923-Version-1.9.1-security-release/"
  );
  # https://vuxml.freebsd.org/freebsd/b63421b6-a1e0-11e7-ac58-b499baebfeaf.html
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?376a2deb"
  );
  script_set_attribute(attribute:"solution", value:"Update the affected package.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2017/09/23");
  script_set_attribute(attribute:"patch_publication_date", value:"2017/09/25");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/09/26");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2017-2018 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:"weechat<1.9.1")) 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");
  • NASL familyDebian Local Security Checks
    NASL idDEBIAN_DLA-1111.NASL
    descriptionIt was discovered that WeeChat
    last seen2020-03-17
    modified2017-09-27
    plugin id103469
    published2017-09-27
    reporterThis script is Copyright (C) 2017-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/103469
    titleDebian DLA-1111-1 : weechat security update
    code
    #%NASL_MIN_LEVEL 80502
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Debian Security Advisory DLA-1111-1. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include("compat.inc");

if (description)
{
  script_id(103469);
  script_version("3.6");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/03/12");

  script_cve_id("CVE-2017-14727");

  script_name(english:"Debian DLA-1111-1 : weechat security update");
  script_summary(english:"Checks dpkg output for the updated packages.");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote Debian host is missing a security update."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"It was discovered that WeeChat's logger plugin is vulnerable to an
invalid buffer read which can be exploited remotely to trigger an
application crash or other undefined behaviour.

For Debian 7 'Wheezy', these problems have been fixed in version
0.3.8-1+deb7u3.

We recommend that you upgrade your weechat packages.

NOTE: Tenable Network Security has extracted the preceding description
block directly from the DLA security advisory. Tenable has attempted
to automatically clean and format it as much as possible without
introducing additional issues."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://lists.debian.org/debian-lts-announce/2017/09/msg00028.html"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://packages.debian.org/source/wheezy/weechat"
  );
  script_set_attribute(attribute:"solution", value:"Upgrade the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/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:L/PR:N/UI:N/S:U/C:N/I:N/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:weechat");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:weechat-core");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:weechat-curses");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:weechat-dbg");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:weechat-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:weechat-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:weechat-plugins");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:7.0");

  script_set_attribute(attribute:"patch_publication_date", value:"2017/09/26");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/09/27");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2017-2020 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"Debian Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/Debian/release", "Host/Debian/dpkg-l");

  exit(0);
}


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


if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/Debian/release")) audit(AUDIT_OS_NOT, "Debian");
if (!get_kb_item("Host/Debian/dpkg-l")) audit(AUDIT_PACKAGE_LIST_MISSING);


flag = 0;
if (deb_check(release:"7.0", prefix:"weechat", reference:"0.3.8-1+deb7u3")) flag++;
if (deb_check(release:"7.0", prefix:"weechat-core", reference:"0.3.8-1+deb7u3")) flag++;
if (deb_check(release:"7.0", prefix:"weechat-curses", reference:"0.3.8-1+deb7u3")) flag++;
if (deb_check(release:"7.0", prefix:"weechat-dbg", reference:"0.3.8-1+deb7u3")) flag++;
if (deb_check(release:"7.0", prefix:"weechat-dev", reference:"0.3.8-1+deb7u3")) flag++;
if (deb_check(release:"7.0", prefix:"weechat-doc", reference:"0.3.8-1+deb7u3")) flag++;
if (deb_check(release:"7.0", prefix:"weechat-plugins", reference:"0.3.8-1+deb7u3")) flag++;

if (flag)
{
  if (report_verbosity > 0) security_warning(port:0, extra:deb_report_get());
  else security_warning(0);
  exit(0);
}
else audit(AUDIT_HOST_NOT, "affected");
  • NASL familySuSE Local Security Checks
    NASL idOPENSUSE-2017-1111.NASL
    descriptionThis update for weechat fixes the following issues : - CVE-2017-14727: A uninitialized buffer could be used to crash the logger plugin in WeeChat (boo#1060140)
    last seen2020-06-05
    modified2017-10-02
    plugin id103591
    published2017-10-02
    reporterThis script is Copyright (C) 2017-2020 Tenable Network Security, Inc.
    sourcehttps://www.tenable.com/plugins/nessus/103591
    titleopenSUSE Security Update : weechat (openSUSE-2017-1111)
    code
    #%NASL_MIN_LEVEL 80502
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from openSUSE Security Update openSUSE-2017-1111.
#
# The text description of this plugin is (C) SUSE LLC.
#

include("compat.inc");

if (description)
{
  script_id(103591);
  script_version("3.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/06/04");

  script_cve_id("CVE-2017-14727");

  script_name(english:"openSUSE Security Update : weechat (openSUSE-2017-1111)");
  script_summary(english:"Check for the openSUSE-2017-1111 patch");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote openSUSE host is missing a security update."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"This update for weechat fixes the following issues :

  - CVE-2017-14727: A uninitialized buffer could be used to
    crash the logger plugin in WeeChat (boo#1060140)"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.opensuse.org/show_bug.cgi?id=1060140"
  );
  script_set_attribute(
    attribute:"solution", 
    value:"Update the affected weechat packages."
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:weechat");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:weechat-aspell");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:weechat-aspell-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:weechat-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:weechat-debugsource");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:weechat-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:weechat-guile");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:weechat-guile-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:weechat-lang");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:weechat-lua");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:weechat-lua-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:weechat-perl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:weechat-perl-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:weechat-python");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:weechat-python-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:weechat-ruby");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:weechat-ruby-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:weechat-tcl");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:weechat-tcl-debuginfo");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:novell:opensuse:42.2");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:novell:opensuse:42.3");

  script_set_attribute(attribute:"patch_publication_date", value:"2017/09/29");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/10/02");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2017-2020 Tenable Network Security, Inc.");
  script_family(english:"SuSE Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/SuSE/release", "Host/SuSE/rpm-list", "Host/cpu");

  exit(0);
}


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

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
release = get_kb_item("Host/SuSE/release");
if (isnull(release) || release =~ "^(SLED|SLES)") audit(AUDIT_OS_NOT, "openSUSE");
if (release !~ "^(SUSE42\.2|SUSE42\.3)$") audit(AUDIT_OS_RELEASE_NOT, "openSUSE", "42.2 / 42.3", release);
if (!get_kb_item("Host/SuSE/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);

ourarch = get_kb_item("Host/cpu");
if (!ourarch) audit(AUDIT_UNKNOWN_ARCH);
if (ourarch !~ "^(i586|i686|x86_64)$") audit(AUDIT_ARCH_NOT, "i586 / i686 / x86_64", ourarch);

flag = 0;

if ( rpm_check(release:"SUSE42.2", reference:"weechat-1.5-2.6.1") ) flag++;
if ( rpm_check(release:"SUSE42.2", reference:"weechat-aspell-1.5-2.6.1") ) flag++;
if ( rpm_check(release:"SUSE42.2", reference:"weechat-aspell-debuginfo-1.5-2.6.1") ) flag++;
if ( rpm_check(release:"SUSE42.2", reference:"weechat-debuginfo-1.5-2.6.1") ) flag++;
if ( rpm_check(release:"SUSE42.2", reference:"weechat-debugsource-1.5-2.6.1") ) flag++;
if ( rpm_check(release:"SUSE42.2", reference:"weechat-devel-1.5-2.6.1") ) flag++;
if ( rpm_check(release:"SUSE42.2", reference:"weechat-guile-1.5-2.6.1") ) flag++;
if ( rpm_check(release:"SUSE42.2", reference:"weechat-guile-debuginfo-1.5-2.6.1") ) flag++;
if ( rpm_check(release:"SUSE42.2", reference:"weechat-lang-1.5-2.6.1") ) flag++;
if ( rpm_check(release:"SUSE42.2", reference:"weechat-lua-1.5-2.6.1") ) flag++;
if ( rpm_check(release:"SUSE42.2", reference:"weechat-lua-debuginfo-1.5-2.6.1") ) flag++;
if ( rpm_check(release:"SUSE42.2", reference:"weechat-perl-1.5-2.6.1") ) flag++;
if ( rpm_check(release:"SUSE42.2", reference:"weechat-perl-debuginfo-1.5-2.6.1") ) flag++;
if ( rpm_check(release:"SUSE42.2", reference:"weechat-python-1.5-2.6.1") ) flag++;
if ( rpm_check(release:"SUSE42.2", reference:"weechat-python-debuginfo-1.5-2.6.1") ) flag++;
if ( rpm_check(release:"SUSE42.2", reference:"weechat-ruby-1.5-2.6.1") ) flag++;
if ( rpm_check(release:"SUSE42.2", reference:"weechat-ruby-debuginfo-1.5-2.6.1") ) flag++;
if ( rpm_check(release:"SUSE42.2", reference:"weechat-tcl-1.5-2.6.1") ) flag++;
if ( rpm_check(release:"SUSE42.2", reference:"weechat-tcl-debuginfo-1.5-2.6.1") ) flag++;
if ( rpm_check(release:"SUSE42.3", reference:"weechat-1.8-3.1") ) flag++;
if ( rpm_check(release:"SUSE42.3", reference:"weechat-aspell-1.8-3.1") ) flag++;
if ( rpm_check(release:"SUSE42.3", reference:"weechat-aspell-debuginfo-1.8-3.1") ) flag++;
if ( rpm_check(release:"SUSE42.3", reference:"weechat-debuginfo-1.8-3.1") ) flag++;
if ( rpm_check(release:"SUSE42.3", reference:"weechat-debugsource-1.8-3.1") ) flag++;
if ( rpm_check(release:"SUSE42.3", reference:"weechat-devel-1.8-3.1") ) flag++;
if ( rpm_check(release:"SUSE42.3", reference:"weechat-guile-1.8-3.1") ) flag++;
if ( rpm_check(release:"SUSE42.3", reference:"weechat-guile-debuginfo-1.8-3.1") ) flag++;
if ( rpm_check(release:"SUSE42.3", reference:"weechat-lang-1.8-3.1") ) flag++;
if ( rpm_check(release:"SUSE42.3", reference:"weechat-lua-1.8-3.1") ) flag++;
if ( rpm_check(release:"SUSE42.3", reference:"weechat-lua-debuginfo-1.8-3.1") ) flag++;
if ( rpm_check(release:"SUSE42.3", reference:"weechat-perl-1.8-3.1") ) flag++;
if ( rpm_check(release:"SUSE42.3", reference:"weechat-perl-debuginfo-1.8-3.1") ) flag++;
if ( rpm_check(release:"SUSE42.3", reference:"weechat-python-1.8-3.1") ) flag++;
if ( rpm_check(release:"SUSE42.3", reference:"weechat-python-debuginfo-1.8-3.1") ) flag++;
if ( rpm_check(release:"SUSE42.3", reference:"weechat-ruby-1.8-3.1") ) flag++;
if ( rpm_check(release:"SUSE42.3", reference:"weechat-ruby-debuginfo-1.8-3.1") ) flag++;
if ( rpm_check(release:"SUSE42.3", reference:"weechat-tcl-1.8-3.1") ) flag++;
if ( rpm_check(release:"SUSE42.3", reference:"weechat-tcl-debuginfo-1.8-3.1") ) flag++;

if (flag)
{
  if (report_verbosity > 0) security_warning(port:0, extra:rpm_report_get());
  else security_warning(0);
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "weechat / weechat-aspell / weechat-aspell-debuginfo / etc");
}

References