Cisco Secure Web Appliance Real-Time Scanning Archive File Bypass (cisco-sa-wsa-archive-bypass-Scx2e8zF)

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

include('compat.inc');

if (description)
{
  script_id(298243);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/03/03");

  script_cve_id("CVE-2026-20056");
  script_xref(name:"CISCO-BUG-ID", value:"CSCwq69761");
  script_xref(name:"CISCO-SA", value:"cisco-sa-wsa-archive-bypass-Scx2e8zF");
  script_xref(name:"IAVA", value:"2026-A-0179");
  script_xref(name:"IAVA", value:"2026-A-0108-S");

  script_name(english:"Cisco Secure Web Appliance Real-Time Scanning Archive File Bypass (cisco-sa-wsa-archive-bypass-Scx2e8zF)");

  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 Web Appliance Real-Time Scanning Archive File Bypass is affected by
a vulnerability.

  - A vulnerability in the Dynamic Vectoring and Streaming (DVS) Engine implementation of Cisco AsyncOS
    Software for Cisco Secure Web Appliance could allow an unauthenticated, remote attacker to bypass the
    anti-malware scanner, allowing malicious archive files to be downloaded. This vulnerability is due to
    improper handling of certain archive files. An attacker could exploit this vulnerability by sending a
    crafted archive file, which should be blocked, through an affected device. A successful exploit could
    allow the attacker to bypass the anti-malware scanner and download malware onto an end user workstation.
    The downloaded malware will not automatically execute unless the end user extracts and launches the
    malicious file. (CVE-2026-20056)

Please see the included Cisco BIDs and Cisco Security Advisory for more information.");
  # https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-wsa-archive-bypass-Scx2e8zF
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?7104852c");
  script_set_attribute(attribute:"see_also", value:"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwq69761");
  script_set_attribute(attribute:"solution", value:
"Upgrade to the relevant fixed version referenced in Cisco bug ID CSCwq69761");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:H/Au:N/C:N/I:P/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-20056");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_cwe_id(494);

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/02/04");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/02/04");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/02/06");

  script_set_attribute(attribute:"plugin_type", value:"combined");
  script_set_attribute(attribute:"cpe", value:"cpe:/h:cisco:web_security_appliance");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:cisco:web_security_appliance");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:asyncos");
  script_set_attribute(attribute:"stig_severity", value:"II");
  script_end_attributes();

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

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

  script_dependencies("cisco_wsa_version.nasl");
  script_require_keys("Host/AsyncOS/Cisco Web Security Appliance/DisplayVersion", "Host/AsyncOS/Cisco Web Security Appliance/Version");

  exit(0);
}

include('ccf.inc');

var product_info = cisco::get_product_info(name:'Cisco Web Security Appliance (WSA)');

var vuln_ranges = [
  {'min_ver': '0.0.0', 'max_ver': '15.2.0', 'fix_ver': '15.2.5-011'}
];

var reporting = make_array(
  'port'          , 0,
  'severity'      , SECURITY_NOTE,
  'version'       , product_info['version'],
  'bug_id'        , 'CSCwq69761',
  'disable_caveat', TRUE
);

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