Ruby news :
CVE-2018-16395: OpenSSL::X509::Name equality check does not work correctly
An instance of OpenSSL::X509::Name contains entities such as CN, C and so on. Some two instances of OpenSSL::X509::Name are equal only when all entities are exactly equal. However, there is a bug that the equality check is not correct if the value of an entity of the argument (right-hand side) starts with the value of the receiver (left-hand side). So, if a malicious X.509 certificate is passed to compare with an existing certificate, there is a possibility to be judged incorrectly that they are equal.
CVE-2018-16396: Tainted flags are not propagated in Array#pack and String#unpack with some directives
Array#pack method converts the receiver’s contents into a string with specified format. If the receiver contains some tainted objects, the returned string also should be tainted. String#unpack method which converts the receiver into an array also should propagate its tainted flag to the objects contained in the returned array. But, with B, b, H and h directives, the tainted flags are not propagated. So, if a script processes unreliable inputs by Array#pack and/or String#unpack with these directives and checks the reliability with tainted flags, the check might be wrong.
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from the FreeBSD VuXML database :
#
# Copyright 2003-2022 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(118247);
script_version("1.4");
script_set_attribute(attribute:"plugin_modification_date", value:"2022/02/07");
script_cve_id("CVE-2018-16395", "CVE-2018-16396");
script_name(english:"FreeBSD : ruby -- multiple vulnerabilities (afc60484-0652-440e-b01a-5ef814747f06)");
script_summary(english:"Checks for updated packages in pkg_info output");
script_set_attribute(
attribute:"synopsis",
value:
"The remote FreeBSD host is missing one or more security-related
updates."
);
script_set_attribute(
attribute:"description",
value:
"Ruby news :
CVE-2018-16395: OpenSSL::X509::Name equality check does not work
correctly
An instance of OpenSSL::X509::Name contains entities such as CN, C and
so on. Some two instances of OpenSSL::X509::Name are equal only when
all entities are exactly equal. However, there is a bug that the
equality check is not correct if the value of an entity of the
argument (right-hand side) starts with the value of the receiver
(left-hand side). So, if a malicious X.509 certificate is passed to
compare with an existing certificate, there is a possibility to be
judged incorrectly that they are equal.
CVE-2018-16396: Tainted flags are not propagated in Array#pack and
String#unpack with some directives
Array#pack method converts the receiver's contents into a string with
specified format. If the receiver contains some tainted objects, the
returned string also should be tainted. String#unpack method which
converts the receiver into an array also should propagate its tainted
flag to the objects contained in the returned array. But, with B, b, H
and h directives, the tainted flags are not propagated. So, if a
script processes unreliable inputs by Array#pack and/or String#unpack
with these directives and checks the reliability with tainted flags,
the check might be wrong."
);
script_set_attribute(
attribute:"see_also",
value:"https://www.ruby-lang.org/en/news/2018/10/17/ruby-2-5-2-released/"
);
# https://www.ruby-lang.org/en/news/2018/10/17/openssl-x509-name-equality-check-does-not-work-correctly-cve-2018-16395/
script_set_attribute(
attribute:"see_also",
value:"http://www.nessus.org/u?2cb277f6"
);
# https://www.ruby-lang.org/en/news/2018/10/17/not-propagated-taint-flag-in-some-formats-of-pack-cve-2018-16396/
script_set_attribute(
attribute:"see_also",
value:"http://www.nessus.org/u?4ea53be8"
);
# https://vuxml.freebsd.org/freebsd/afc60484-0652-440e-b01a-5ef814747f06.html
script_set_attribute(
attribute:"see_also",
value:"http://www.nessus.org/u?60c17970"
);
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:U/RL:OF/RC:C");
script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/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-2018-16395");
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:freebsd:freebsd:ruby");
script_set_attribute(attribute:"cpe", value:"cpe:/o:freebsd:freebsd");
script_set_attribute(attribute:"vuln_publication_date", value:"2018/10/17");
script_set_attribute(attribute:"patch_publication_date", value:"2018/10/20");
script_set_attribute(attribute:"plugin_publication_date", value:"2018/10/22");
script_set_attribute(attribute:"generated_plugin", value:"current");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_copyright(english:"This script is Copyright (C) 2018-2022 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:"ruby>=2.3.0,1<2.3.8,1")) flag++;
if (pkg_test(save_report:TRUE, pkg:"ruby>=2.4.0,1<2.4.5,1")) flag++;
if (pkg_test(save_report:TRUE, pkg:"ruby>=2.5.0,1<2.5.2,1")) flag++;
if (flag)
{
if (report_verbosity > 0) security_hole(port:0, extra:pkg_report_get());
else security_hole(0);
exit(0);
}
else audit(AUDIT_HOST_NOT, "affected");