CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:N/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
Percentile
52.6%
According to its self-reported version, Cisco Web Security Appliance (WSA) is affected by a denial of service (DoS) vulnerability due to improper validation of HTTP / HTTPS requests. An unauthenticated, remote attacker can exploit this issue, by sending malformed requests, to cause the application to temporarily stop responding.
Please see the included Cisco BIDs and Cisco Security Advisory for more information
#TRUSTED 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
#
# (C) Tenable Network Security, Inc.
#
include('compat.inc');
if (description)
{
script_id(126632);
script_version("1.11");
script_set_attribute(attribute:"plugin_modification_date", value:"2021/05/14");
script_cve_id("CVE-2019-1817");
script_xref(name:"CISCO-BUG-ID", value:"CSCvn31450");
script_xref(name:"CISCO-SA", value:"cisco-sa-20190501-wsa-dos");
script_name(english:"Cisco Web Security Appliance Malformed Request Denial of Service Vulnerability");
script_summary(english:"Checks the version of Cisco Web Security Appliance (WSA)");
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 Web Security Appliance (WSA) is affected by a denial of service (DoS)
vulnerability due to improper validation of HTTP / HTTPS requests. An unauthenticated, remote attacker can exploit this
issue, by sending malformed requests, to cause the application to temporarily stop responding.
Please see the included Cisco BIDs and Cisco Security Advisory for more information");
# https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190501-wsa-dos
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?ed846d6a");
script_set_attribute(attribute:"see_also", value:"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvn31450");
script_set_attribute(attribute:"solution", value:
"Upgrade to the relevant fixed version referenced in Cisco bug ID CSCvn31450");
script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P");
script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H");
script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
script_set_attribute(attribute:"cvss_score_source", value:"CVE-2019-1817");
script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
script_cwe_id(20);
script_set_attribute(attribute:"vuln_publication_date", value:"2019/05/01");
script_set_attribute(attribute:"patch_publication_date", value:"2019/05/01");
script_set_attribute(attribute:"plugin_publication_date", value:"2019/07/12");
script_set_attribute(attribute:"plugin_type", value:"local");
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:web_security_appliance");
script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:asyncos");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"CISCO");
script_copyright(english:"This script is Copyright (C) 2019-2021 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('cisco_workarounds.inc');
include('ccf.inc');
product_info = cisco::get_product_info(name:'Cisco Web Security Appliance (WSA)');
workarounds = make_list(CISCO_WORKAROUNDS['no_workaround']);
workaround_params = make_list();
reporting = make_array(
'port' , 0,
'severity' , SECURITY_WARNING,
'version' , product_info['version'],
'bug_id' , 'CSCvn31450'
);
vuln_ranges = [
{ 'min_ver' : '11.5', 'fix_ver' : '11.5.2.020' },
{ 'min_ver' : '11.7', 'fix_ver' : '11.7.0.406' }
];
cisco::check_and_report(
product_info:product_info,
workarounds:workarounds,
workaround_params:workaround_params,
reporting:reporting,
vuln_ranges:vuln_ranges
);
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:N/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
Percentile
52.6%