Insufficient symlink verification could allow data access
outside share path.
# Copyright (C) 2021 Greenbone Networks GmbH
# Some text descriptions might be excerpted from (a) referenced
# source(s), and are Copyright (C) by the respective right holder(s).
#
# SPDX-License-Identifier: GPL-2.0-or-later
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
CPE = "cpe:/a:samba:samba";
if(description)
{
script_oid("1.3.6.1.4.1.25623.1.0.150746");
script_version("2022-08-31T10:10:28+0000");
script_tag(name:"last_modification", value:"2022-08-31 10:10:28 +0000 (Wed, 31 Aug 2022)");
script_tag(name:"creation_date", value:"2021-09-24 10:59:30 +0000 (Fri, 24 Sep 2021)");
script_tag(name:"cvss_base", value:"5.0");
script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:N/I:P/A:N");
script_tag(name:"severity_vector", value:"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N");
script_tag(name:"severity_origin", value:"NVD");
script_tag(name:"severity_date", value:"2022-08-29 20:26:00 +0000 (Mon, 29 Aug 2022)");
script_cve_id("CVE-2015-5252");
script_tag(name:"qod_type", value:"remote_banner_unreliable");
script_tag(name:"solution_type", value:"VendorFix");
script_name("Samba 3.0.0 <= 4.3.2 Bypass File-Access Restrictions Vulnerability (CVE-2015-5252)");
script_category(ACT_GATHER_INFO);
script_copyright("Copyright (C) 2021 Greenbone Networks GmbH");
script_family("Denial of Service");
script_dependencies("smb_nativelanman.nasl", "gb_samba_detect.nasl");
script_mandatory_keys("samba/smb_or_ssh/detected");
script_tag(name:"summary", value:"Insufficient symlink verification could allow data access
outside share path.");
script_tag(name:"vuldetect", value:"Checks if a vulnerable version is present on the target host.");
script_tag(name:"insight", value:"All versions of Samba from 3.0.0 to 4.3.2 inclusive are vulnerable to
a bug in symlink verification, which under certain circumstances could
allow client access to files outside the exported share path.
If a Samba share is configured with a path that shares a common path
prefix with another directory on the file system, the smbd daemon may
allow the client to follow a symlink pointing to a file or directory
in that other directory, even if the share parameter 'wide links' is
set to 'no' (the default).");
script_tag(name:"affected", value:"Samba versions 3.0.0 through 4.1.21, 4.2.0 through 4.2.6 and
4.3.0 through 4.3.2.");
script_tag(name:"solution", value:"Update to version 4.1.22, 4.2.7, 4.3.3 or later.");
script_xref(name:"URL", value:"https://www.samba.org/samba/security/CVE-2015-5252.html");
exit(0);
}
include("host_details.inc");
include("version_func.inc");
if (isnull(port = get_app_port(cpe: CPE)))
exit(0);
if (!infos = get_app_version_and_location(cpe: CPE, port: port, exit_no_version: TRUE))
exit(0);
version = infos["version"];
location = infos["location"];
if (version_in_range(version: version, test_version: "3.0.0", test_version2: "4.1.21")) {
report = report_fixed_ver(installed_version: version, fixed_version: "4.1.22", install_path: location);
security_message(port: port, data: report);
exit(0);
}
if (version_in_range(version: version, test_version: "4.2.0", test_version2: "4.2.6")) {
report = report_fixed_ver(installed_version: version, fixed_version: "4.2.7", install_path: location);
security_message(port: port, data: report);
exit(0);
}
if (version_in_range(version: version, test_version: "4.3.0", test_version2: "4.3.2")) {
report = report_fixed_ver(installed_version: version, fixed_version: "4.3.3", install_path: location);
security_message(port: port, data: report);
exit(0);
}
exit(99);