ModSecurity 'SecCacheTransformations' Security Bypass Vulnerability

###############################################################################
# OpenVAS Vulnerability Test
# $Id: secpod_modsecurity_sec_bypass_vuln.nasl 4522 2016-11-15 14:52:19Z teissa $
#
# ModSecurity 'SecCacheTransformations' Security Bypass Vulnerability
#
# Authors:
# Sujit Ghosal <[email protected]>
#
# Copyright:
# Copyright (c) 2008 SecPod, http://www.secpod.com
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2
# (or any later version), as published by the Free Software Foundation.
#
# 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.
###############################################################################

tag_impact = "Successful exploitation will allow attacker to execute arbitrary codes in
  the context of the web application and bypass certain security restrictions.";
tag_affected = "ModSecurity version from 2.5.0 to 2.5.5 on Linux.";
tag_insight = "This flaw is due an error within the transformation caching which can cause
  evasion into ModSecurity. These can be exploited when SecCacheTransformations
  is enabled.";
tag_solution = "Upgrade to version 2.5.6 or later.
  http://www.modsecurity.org/download/";
tag_summary = "This host is running ModSecurity and is prone to Security Bypass
  vulnerability.";

if(description)
{
  script_id(900414);
  script_version("$Revision: 4522 $");
  script_tag(name:"last_modification", value:"$Date: 2016-11-15 15:52:19 +0100 (Tue, 15 Nov 2016) $");
  script_tag(name:"creation_date", value:"2008-12-31 15:14:17 +0100 (Wed, 31 Dec 2008)");
  script_tag(name:"cvss_base", value:"5.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:N/I:N/A:P");
  script_cve_id("CVE-2008-5676");
  script_bugtraq_id(31672);
  script_name("ModSecurity 'SecCacheTransformations' Security Bypass Vulnerability");
  script_xref(name : "URL" , value : "http://secunia.com/advisories/32146");
  script_xref(name : "URL" , value : "http://blog.modsecurity.org/2008/08/transformation.html");

  script_category(ACT_GATHER_INFO);
  script_tag(name:"qod_type", value:"executable_version");
  script_copyright("Copyright (C) 2008 SecPod");
  script_family("Web Servers");
  script_mandatory_keys("login/SSH/success");
  script_dependencies("gather-package-list.nasl");
  script_tag(name : "impact" , value : tag_impact);
  script_tag(name : "affected" , value : tag_affected);
  script_tag(name : "insight" , value : tag_insight);
  script_tag(name : "solution" , value : tag_solution);
  script_tag(name : "summary" , value : tag_summary);
  exit(0);
}


include("ssh_func.inc");
include("version_func.inc");

sock = ssh_login_or_reuse_connection();
if(!sock){
  exit(0);
}

grep = find_bin(prog_name:"grep", sock:sock);
grep = chomp(grep[0]);

garg[0] = "-o";
garg[1] = "-m1";
garg[2] = "-a";
garg[3] = string("ModSecurity v[0-9]\\+.[0-9]\\+.[0-9]\\+");

modName = find_file(file_name:"mod_security.so", file_path:"/",
                      useregex:TRUE, regexpar:"$", sock:sock);
foreach binaryName (modName)
{
  binaryName = chomp(binaryName);
  if(islocalhost())
  {
    garg[4] = binaryName;
    arg = garg;
  }
  else{
    arg = garg[0] + " " + garg[1] + " " + garg[2] + " " + raw_string(0x22) +
          garg[3] + raw_string(0x22) + " " + binaryName;
  }

  modsecVer = get_bin_version(full_prog_name:grep, version_argv:arg,
                              ver_pattern:"[0-9]+.[0-9]+.[0-9]+", sock:sock);
  if(modsecVer[0] != NULL)
  {
    if(version_in_range(version:modsecVer[0], test_version:"2.5.0",
                                           test_version2:"2.5.5")){
      security_message(0);
    }
    ssh_close_connection();
    exit(0);
  }
}
ssh_close_connection();