libpng pngwutil.c NULL pointer 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("1.3.6.1.4.1.25623.1.0.900071");
  script_version("2022-02-25T14:06:46+0000");
  script_tag(name:"last_modification", value:"2022-02-25 14:06:46 +0000 (Fri, 25 Feb 2022)");
  script_tag(name:"creation_date", value:"2009-01-22 12:00:13 +0100 (Thu, 22 Jan 2009)");
  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_cve_id("CVE-2008-5907");
  script_name("libpng pngwutil.c NULL pointer Vulnerability");
  script_xref(name:"URL", value:"http://openwall.com/lists/oss-security/2009/01/09/1");

  script_tag(name:"qod_type", value:"executable_version_unreliable");
  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2009 Greenbone Networks GmbH");
  script_family("General");
  script_dependencies("secpod_libpng_detect_lin.nasl");
  script_mandatory_keys("Libpng/Version");
  script_tag(name:"impact", value:"Successful remote exploitation could result in arbitrary code execution
  on the affected system.");
  script_tag(name:"affected", value:"libpng 1.0.41 and prior and 1.2.x to 1.2.33 on Linux.");
  script_tag(name:"insight", value:"Attackers can set the value of arbitrary memory location to zero via
  vectors involving creation of crafted PNG files with keywords, related
  to an implicit cast of the '\0' character constant to a NULL pointer.");
  script_tag(name:"solution", value:"Upgrade to libpng 1.0.42 or 1.2.34.");
  script_tag(name:"summary", value:"libpng is prone to a memory overwrite vulnerability.");

  script_tag(name:"solution_type", value:"VendorFix");

  exit(0);
}

include("version_func.inc");

pngVer = get_kb_item("Libpng/Version");
if(!pngVer)
  exit(0);

if(version_is_less_equal(version:pngVer, test_version:"1.0.41")||
   version_in_range(version:pngVer, test_version:"1.2.0", test_version2:"1.2.33")){
  security_message( port: 0, data: "The target host was found to be vulnerable" );
}