Cisco Secure Firewall Adaptive Security Appliance VPN Web Server Remote Code Execution (cisco-sa-asaftd-webvpn-z5xP8EUB)

#TRUSTED 2965837ff177a5599e1996b34d82c3c2add514e0db4eb06e474a1771111a7d5b8ee62070f593440a2a81ff29347e39657778c667b054d81436e937b41b998d3614099bdc0b5e3cf475f98950041ba5fdc34443b58d3af17877ee0b00101ec46546ea799da55885decd4323c37822b36d2cc53db20461a0b2f34258e93e69aef7272ccb040fae5aafec6ea446b161bcf1cae7aeb5d757b436d8600a0c4a4ebd1fd11c12da496095b3d35a0d4b7bc1e3f80eef33860935e0ba0f6b511a272859cd9e59ded4287ef2f8e53abe0da163613799e5039da4e064b48e0ba5461c8d4dc9825bc4f65cf6fe3bbd7dc24272b1e4b9da66f0675e7c6354ec2635bb410e68d5c3a375ff109ed2beccd315f21c985e7a9e7e474e367ffeebd05e86e63bb81e60f2a4da6821ececee599f672017744ce8935cca4cb786641f0c904ca352278128744090fc8272b00ecdbf4bc738f2df6c4af1825244bf8c33062e8447b7d334f9eb593aaaba470a3e33e8a8c12d3e1bc87007bdc4e06aba5c196ddcfe0299570560593ffb72d4d88345ce4397607b257e55664e92ec0484b89957d98ba4717526cf58b035410943f6feb50087f4356fd7b91ef323ea4aa284c17ad60df574ddfdc2c98a329a8dbd7231d4b6913c06e3699d36de3bcc9ed371046eee6610186b111aa1592af7ec24b71361e1a84164d1cc087f940783e20adf15734fb183b1eacc
#TRUST-RSA-SHA256 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
#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

include('compat.inc');

if (description)
{
  script_id(265942);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/10/27");

  script_cve_id("CVE-2025-20333");
  script_xref(name:"CISCO-BUG-ID", value:"CSCwq79831");
  script_xref(name:"CISCO-SA", value:"cisco-sa-asaftd-webvpn-z5xP8EUB");
  script_xref(name:"IAVA", value:"2025-A-0702");
  script_xref(name:"CISA-KNOWN-EXPLOITED", value:"2025/09/26");

  script_name(english:"Cisco Secure Firewall Adaptive Security Appliance VPN Web Server Remote Code Execution (cisco-sa-asaftd-webvpn-z5xP8EUB)");

  script_set_attribute(attribute:"synopsis", value:
"The remote device is missing a vendor-supplied security patch");
  script_set_attribute(attribute:"description", value:
"According to its self-reported version, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software is affected by
a vulnerability:

  - A vulnerability in the VPN web server of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco
    Secure Firewall Threat Defense (FTD) Software could allow an authenticated, remote attacker to execute arbitrary
    code on an affected device. This vulnerability is due to improper validation of user-supplied input in HTTP(S)
    requests. An attacker with valid VPN user credentials could exploit this vulnerability by sending crafted HTTP
    requests to an affected device. A successful exploit could allow the attacker to execute arbitrary code as root,
    possibly resulting in the complete compromise of the affected device. (CVE-2025-20333)

Please see the included Cisco BIDs and Cisco Security Advisory for more information.");
  # https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-webvpn-z5xP8EUB
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?a46635ab");
  script_set_attribute(attribute:"see_also", value:"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwq79831");
  script_set_attribute(attribute:"solution", value:
"Upgrade to the relevant fixed version referenced in Cisco bug ID CSCwq79831");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:F/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:F/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2025-20333");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2025/09/25");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/09/25");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/09/26");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:cisco:adaptive_security_appliance_software");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"CISCO");

  script_copyright(english:"This script is Copyright (C) 2025 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/Cisco/ASA/model");

  exit(0);
}

include('ccf.inc');
include('cisco_workarounds.inc');

var product_info = cisco::get_product_info(name:'Cisco Adaptive Security Appliance (ASA) Software');

var vuln_ranges = [
  {'min_ver':'9.12', 'fix_ver':'9.12.4.72'},
  {'min_ver':'9.14', 'fix_ver':'9.14.4.28'},
  {'min_ver':'9.16', 'fix_ver':'9.16.4.85'},
  {'min_ver':'9.17', 'fix_ver':'9.17.1.45'},
  {'min_ver':'9.18', 'fix_ver':'9.18.4.47'},
  {'min_ver':'9.19', 'fix_ver':'9.19.1.37'},
  {'min_ver':'9.20', 'fix_ver':'9.20.3.7'},
  {'min_ver':'9.22', 'fix_ver':'9.22.1.3'}
];

var workarounds = make_list(CISCO_WORKAROUNDS['generic_workaround']);
var workaround_params = [
  WORKAROUND_CONFIG['anyconnect_client_services'],
  WORKAROUND_CONFIG['mobile_user_security'],
  WORKAROUND_CONFIG['ssl_vpn']
];

var reporting = make_array(
  'port'    , 0,
  'severity', SECURITY_HOLE,
  'version' , product_info['version'],
  'bug_id'  , 'CSCwq79831'
);

cisco::check_and_report(
  product_info:product_info,
  workarounds:workarounds,
  workaround_params:workaround_params,
  reporting:reporting,
  vuln_ranges:vuln_ranges
);