FreeBSD : py-rsa -- Bleichenbacher'06 signature forgery vulnerability (e78bfc9d-cb1e-11e5-b251-0050562a4d7b)

2016-02-05T00:00:00
ID FREEBSD_PKG_E78BFC9DCB1E11E5B2510050562A4D7B.NASL
Type nessus
Reporter Tenable
Modified 2018-12-19T00:00:00

Description

Filippo Valsorda reports :

python-rsa is vulnerable to a straightforward variant of the Bleichenbacher'06 attack against RSA signature verification with low public exponent.

                                        
                                            #
# (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(88585);
  script_version("2.5");
  script_cvs_date("Date: 2018/12/19 13:21:18");

  script_cve_id("CVE-2016-1494");

  script_name(english:"FreeBSD : py-rsa -- Bleichenbacher'06 signature forgery vulnerability (e78bfc9d-cb1e-11e5-b251-0050562a4d7b)");
  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:
"Filippo Valsorda reports :

python-rsa is vulnerable to a straightforward variant of the
Bleichenbacher'06 attack against RSA signature verification with low
public exponent."
  );
  # https://blog.filippo.io/bleichenbacher-06-signature-forgery-in-python-rsa/
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?24eb0dd8"
  );
  # https://bitbucket.org/sybren/python-rsa/pull-requests/14/security-fix-bb06-attack-in-verify-by
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?525636eb"
  );
  # https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-1494
  script_set_attribute(
    attribute:"see_also",
    value:"https://nvd.nist.gov/vuln/detail/CVE-2016-1494"
  );
  # http://www.openwall.com/lists/oss-security/2016/01/05/3
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.openwall.com/lists/oss-security/2016/01/05/3"
  );
  # http://www.openwall.com/lists/oss-security/2016/01/05/1
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.openwall.com/lists/oss-security/2016/01/05/1"
  );
  # https://vuxml.freebsd.org/freebsd/e78bfc9d-cb1e-11e5-b251-0050562a4d7b.html
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?57f521bd"
  );
  script_set_attribute(attribute:"solution", value:"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:N");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:freebsd:freebsd:py27-rsa");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:freebsd:freebsd:py32-rsa");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:freebsd:freebsd:py33-rsa");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:freebsd:freebsd:py34-rsa");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:freebsd:freebsd:py35-rsa");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:freebsd:freebsd");

  script_set_attribute(attribute:"vuln_publication_date", value:"2016/01/05");
  script_set_attribute(attribute:"patch_publication_date", value:"2016/02/04");
  script_set_attribute(attribute:"plugin_publication_date", value:"2016/02/05");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2016-2018 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:"py27-rsa<3.3")) flag++;
if (pkg_test(save_report:TRUE, pkg:"py32-rsa<3.3")) flag++;
if (pkg_test(save_report:TRUE, pkg:"py33-rsa<3.3")) flag++;
if (pkg_test(save_report:TRUE, pkg:"py34-rsa<3.3")) flag++;
if (pkg_test(save_report:TRUE, pkg:"py35-rsa<3.3")) 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");