UnrealIRCd Buffer Overflow Vulnerability

# SPDX-FileCopyrightText: 2010 Greenbone AG
# 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-only

CPE = "cpe:/a:unrealircd:unrealircd";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.901126");
  script_version("2025-03-05T05:38:52+0000");
  script_tag(name:"last_modification", value:"2025-03-05 05:38:52 +0000 (Wed, 05 Mar 2025)");
  script_tag(name:"creation_date", value:"2010-06-22 14:43:46 +0200 (Tue, 22 Jun 2010)");
  script_cve_id("CVE-2009-4893");
  script_tag(name:"cvss_base", value:"6.8");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:M/Au:N/C:P/I:P/A:P");
  script_name("UnrealIRCd Buffer Overflow Vulnerability");

  script_tag(name:"impact", value:"Successful exploitation will allow attacker
  to cause a denial of service and possibly execute arbitrary code via unspecified
  vectors.");

  script_tag(name:"affected", value:"UnrealIRCd version 3.2beta11 through 3.2.8");

  script_tag(name:"insight", value:"The flaw is caused by an error when
  allow::options::noident is enabled, which allows remote attackers to cause a
  denial of service and possibly execute arbitrary code via unspecified vectors.");

  script_tag(name:"summary", value:"UnrealIRCd is prone to a buffer overflow vulnerability.");

  script_tag(name:"solution", value:"Upgrade to UnrealIRCd version 3.2.8.1 or later.");

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

  script_xref(name:"URL", value:"http://security.gentoo.org/glsa/glsa-201006-21.xml");
  script_xref(name:"URL", value:"http://www.openwall.com/lists/oss-security/2010/06/14/13");
  script_xref(name:"URL", value:"http://www.unrealircd.com/txt/unrealsecadvisory.20090413.txt");

  ## not vulnerable if allow::options::noident is not enabled.
  script_tag(name:"qod_type", value:"remote_banner_unreliable");
  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2010 Greenbone AG");
  script_family("Buffer overflow");
  script_dependencies("gb_unrealircd_detect.nasl");
  script_mandatory_keys("UnrealIRCD/Detected");

  exit(0);
}

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

if(!UnPort = get_app_port(cpe:CPE)){
  exit(0);
}

if(!UnVer = get_app_version(cpe:CPE, port:UnPort)){
  exit(0);
}

if(UnVer =~ "^3\.2")
{
  if(version_in_range(version:UnVer, test_version:"3.2", test_version2:"3.2.8"))
  {
    report = report_fixed_ver(installed_version:UnVer, fixed_version:"3.2.8.1");
    security_message(data:report, port:UnPort);
    exit(0);
  }
}

exit(99);