Cisco ASA/FTD WebVPN/AnyConnect Improper Input Validation (CVE-2020-3452)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

include('compat.inc');

if (description)
{
  script_id(505544);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/07/21");

  script_cve_id("CVE-2020-3452");
  script_xref(name:"CISA-KNOWN-EXPLOITED", value:"2022/05/03");
  script_xref(name:"CEA-ID", value:"CEA-2020-0060");

  script_name(english:"Cisco ASA/FTD WebVPN/AnyConnect Improper Input Validation (CVE-2020-3452)");

  script_set_attribute(attribute:"synopsis", value:
"The remote OT asset is affected by a vulnerability.");
  script_set_attribute(attribute:"description", value:
"A vulnerability in the web services interface of Cisco Adaptive
Security Appliance (ASA) Software and Cisco Firepower Threat Defense
(FTD) Software could allow an unauthenticated, remote attacker to
conduct directory traversal attacks and read sensitive files on a
targeted system. The vulnerability is due to a lack of proper input
validation of URLs in HTTP requests processed by an affected device.
An attacker could exploit this vulnerability by sending a crafted
HTTP request containing directory traversal character sequences to an
affected device. A successful exploit could allow the attacker to view
arbitrary files within the web services file system on the targeted
device. The web services file system is enabled when the affected
device is configured with either WebVPN or AnyConnect features. This
vulnerability cannot be used to obtain access to ASA or FTD system
files or underlying operating system (OS) files.

This plugin only works with Tenable.ot.
Please visit https://www.tenable.com/products/tenable-ot for more information.");
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?ab4e06a8");
  script_set_attribute(attribute:"solution", value:
"Refer to the vendor advisory.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N");
  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:N/UI:N/S:U/C:H/I:N/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:F/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2020-3452");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_cwe_id(20);

  script_set_attribute(attribute:"vuln_publication_date", value:"2020/07/22");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/07/22");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/07/20");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:adaptive_security_appliance_software");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:firepower_threat_defense");
  script_set_attribute(attribute:"generated_plugin", value:"former");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Tenable.ot");

  script_copyright(english:"This script is Copyright (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("tenable_ot_api_integration.nasl");
  script_require_keys("Tenable.ot/Cisco");

  exit(0);
}


include('tenable_ot_cve_funcs.inc');

get_kb_item_or_exit('Tenable.ot/Cisco');

var asset = tenable_ot::assets::get(vendor:'Cisco');

var vuln_cpes = {
    "cpe:/o:cisco:adaptive_security_appliance_software:9.6_branch" :
        {"versionStartIncluding" : "9.6.0", "versionEndExcluding" : "9.6.4.42", "family" : "CiscoFirepower", "os" : "ASA"},
    "cpe:/o:cisco:adaptive_security_appliance_software:9.8_branch" :
        {"versionStartIncluding" : "9.8.0", "versionEndExcluding" : "9.8.4.20", "family" : "CiscoFirepower", "os" : "ASA"},
    "cpe:/o:cisco:adaptive_security_appliance_software:9.9_branch" :
        {"versionStartIncluding" : "9.9.0", "versionEndExcluding" : "9.9.2.74", "family" : "CiscoFirepower", "os" : "ASA"},
    "cpe:/o:cisco:adaptive_security_appliance_software:9.10_branch" :
        {"versionStartIncluding" : "9.10.0", "versionEndExcluding" : "9.10.1.42", "family" : "CiscoFirepower", "os" : "ASA"},
    "cpe:/o:cisco:adaptive_security_appliance_software:9.12_branch" :
        {"versionStartIncluding" : "9.12.0", "versionEndExcluding" : "9.12.3.12", "family" : "CiscoFirepower", "os" : "ASA"},
    "cpe:/o:cisco:adaptive_security_appliance_software:9.13_branch" :
        {"versionStartIncluding" : "9.13.0", "versionEndExcluding" : "9.13.1.10", "family" : "CiscoFirepower", "os" : "ASA"},
    "cpe:/o:cisco:adaptive_security_appliance_software:9.14_branch" :
        {"versionStartIncluding" : "9.14.0", "versionEndExcluding" : "9.14.1.10", "family" : "CiscoFirepower", "os" : "ASA"},
    "cpe:/o:cisco:firepower_threat_defense:6.2.3_branch" :
        {"versionStartIncluding" : "6.2.3", "versionEndExcluding" : "6.2.3.16", "family" : "CiscoFirepower", "os" : "FTD"},
    "cpe:/o:cisco:firepower_threat_defense:6.3.0_branch" :
        {"versionStartIncluding" : "6.3.0", "versionEndExcluding" : "6.3.0.6", "family" : "CiscoFirepower", "os" : "FTD"},
    "cpe:/o:cisco:firepower_threat_defense:6.4.0_branch" :
        {"versionStartIncluding" : "6.4.0", "versionEndExcluding" : "6.4.0.10", "family" : "CiscoFirepower", "os" : "FTD"},
    "cpe:/o:cisco:firepower_threat_defense:6.5.0_branch" :
        {"versionStartIncluding" : "6.5.0", "versionEndExcluding" : "6.5.0.5", "family" : "CiscoFirepower", "os" : "FTD"},
    "cpe:/o:cisco:firepower_threat_defense:6.6.0_branch" :
        {"versionStartIncluding" : "6.6.0", "versionEndExcluding" : "6.6.0.1", "family" : "CiscoFirepower", "os" : "FTD"}
};

tenable_ot::cve::compare_and_report(asset:asset, cpes:vuln_cpes, severity:SECURITY_WARNING);