BackupPC 'ClientNameAlias' Function Security Bypass Vulnerability

# Copyright (C) 2009 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.

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.801107");
  script_version("2022-06-01T08:09:05+0000");
  script_tag(name:"last_modification", value:"2022-06-01 08:09:05 +0000 (Wed, 01 Jun 2022)");
  script_tag(name:"creation_date", value:"2009-10-08 08:22:29 +0200 (Thu, 08 Oct 2009)");
  script_tag(name:"cvss_base", value:"8.5");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:M/Au:S/C:C/I:C/A:C");
  script_cve_id("CVE-2009-3369");
  script_name("BackupPC 'ClientNameAlias' Function Security Bypass Vulnerability");

  script_xref(name:"URL", value:"http://secunia.com/advisories/36393");
  script_xref(name:"URL", value:"http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=542218");

  script_tag(name:"qod_type", value:"executable_version");
  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2009 Greenbone Networks GmbH");
  script_family("General");
  script_dependencies("gb_backuppc_detect.nasl");
  script_mandatory_keys("BackupPC/Ver");

  script_tag(name:"impact", value:"Successful attacks may allow remote authenticated users to read
  and write sensitive files by modifying ClientNameAlias to match another system,
  then initiating a backup or restore on the victim's system.");

  script_tag(name:"affected", value:"BackupPC version 3.1.0 and prior.");

  script_tag(name:"insight", value:"The security issue is due to the application allowing users to
  set the 'ClientNameAlias' option for configured hosts. This can be exploited to
  backup arbitrary directories from client systems for which Rsync over SSH is
  configured as a transfer method.");

  script_tag(name:"summary", value:"BackupPC is prone to a security bypass vulnerability.");

  script_tag(name:"solution_type", value:"VendorFix");
  script_tag(name:"solution", value:"Update to version 3.1.0-7 or later.");
  exit(0);
}

include("version_func.inc");

backuppcVer = get_kb_item("BackupPC/Ver");
if(backuppcVer)
{
  if(version_in_range(version:backuppcVer, test_version:"3.0", test_version2:"3.1.0")){
     report = report_fixed_ver(installed_version:backuppcVer, vulnerable_range:"3.0 - 3.1.0");
     security_message(port: 0, data: report);
  }
}