FreeBSD : libvirt -- ACL bypass using ../ to access beyond storage pool (f714b4c9-a6c1-11e5-88d7-047d7b492d07)

2015-12-21T00:00:00
ID FREEBSD_PKG_F714B4C9A6C111E588D7047D7B492D07.NASL
Type nessus
Reporter This script is Copyright (C) 2015-2018 and is owned by Tenable, Inc. or an Affiliate thereof.
Modified 2020-08-02T00:00:00

Description

Libvit development team reports :

Various virStorageVol* API operate on user-supplied volume names by concatenating the volume name to the pool location. Note that the virStoragePoolListVolumes API, when used on a storage pool backed by a directory in a file system, will only list volumes immediately in that directory (there is no traversal into subdirectories). However, other APIs such as virStorageVolCreateXML were not checking if a potential volume name represented one of the volumes that could be returned by virStoragePoolListVolumes; because they were not rejecting the use of

                                        
                                            #
# (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(87515);
  script_version("2.6");
  script_cvs_date("Date: 2018/11/23 12:49:57");

  script_cve_id("CVE-2015-5313");

  script_name(english:"FreeBSD : libvirt -- ACL bypass using ../ to access beyond storage pool (f714b4c9-a6c1-11e5-88d7-047d7b492d07)");
  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:
"Libvit development team reports :

Various virStorageVol* API operate on user-supplied volume names by
concatenating the volume name to the pool location. Note that the
virStoragePoolListVolumes API, when used on a storage pool backed by a
directory in a file system, will only list volumes immediately in that
directory (there is no traversal into subdirectories). However, other
APIs such as virStorageVolCreateXML were not checking if a potential
volume name represented one of the volumes that could be returned by
virStoragePoolListVolumes; because they were not rejecting the use of
'/' in a volume name.

Because no checking was done on volume names, a user could supply a
potential volume name of something like '../../../etc/passwd' to
attempt to access a file not belonging to the storage pool. When
fine-grained Access Control Lists (ACL) are in effect, a user with
storage_vol:create ACL permission but lacking domain:write permission
could thus abuse virStorageVolCreateXML and similar APIs to gain
access to files not normally permitted to that user. Fortunately, it
appears that the only APIs that could leak information or corrupt
files require read-write connection to libvirtd; and when ACLs are not
in use (the default without any further configuration), a user with
read-write access can already be considered to have full access to the
machine, and without an escalation of privilege there is no security
problem."
  );
  # http://security.libvirt.org/2015/0004.html
  script_set_attribute(
    attribute:"see_also",
    value:"https://security.libvirt.org/2015/0004.html"
  );
  # https://vuxml.freebsd.org/freebsd/f714b4c9-a6c1-11e5-88d7-047d7b492d07.html
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?853d501e"
  );
  script_set_attribute(attribute:"solution", value:"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:M/Au:N/C:N/I:P/A:N");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:H/PR:L/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:libvirt");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:freebsd:freebsd");

  script_set_attribute(attribute:"vuln_publication_date", value:"2015/10/30");
  script_set_attribute(attribute:"patch_publication_date", value:"2015/12/20");
  script_set_attribute(attribute:"plugin_publication_date", value:"2015/12/21");
  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:"libvirt>=1.1.0<1.2.19_2")) flag++;
if (pkg_test(save_report:TRUE, pkg:"libvirt>=1.2.20<1.3.0")) flag++;

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