CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:L/Au:N/C:C/I:C/A:C
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
AI Score
Confidence
High
EPSS
Percentile
78.0%
The version of Palo Alto Networks PAN-OS running on the remote host is 8.0.x prior to 8.1.15 or 9.0.x prior to 9.0.9 or 9.1.x prior to 9.1.3. It is, therefore, affected by a buffer overflow condition in the Captive Portal or Multi-Factor Authentication interface. An unauthenticated, remote attacker can exploit this, via a malicious request to the Captive Portal or Multi-Factor Authentication interface, to disrupt system processes and potentially execute arbitrary code.
Note that Nessus has not tested for this issue but has instead relied only on the application’s self-reported version number.
#
# (C) Tenable Network Security, Inc.
#
include('compat.inc');
if (description)
{
script_id(140516);
script_version("1.4");
script_set_attribute(attribute:"plugin_modification_date", value:"2022/12/05");
script_cve_id("CVE-2020-2040");
script_xref(name:"IAVA", value:"2020-A-0418-S");
script_xref(name:"CEA-ID", value:"CEA-2020-0120");
script_name(english:"Palo Alto Networks PAN-OS 8.0.x < 8.1.15 / 9.0.x < 9.0.9 / 9.1.x < 9.1.3 Buffer Overflow");
script_set_attribute(attribute:"synopsis", value:
"The remote PAN-OS host is affected by a vulnerability");
script_set_attribute(attribute:"description", value:
"The version of Palo Alto Networks PAN-OS running on the remote host is 8.0.x prior to 8.1.15 or 9.0.x prior to 9.0.9
or 9.1.x prior to 9.1.3. It is, therefore, affected by a buffer overflow condition in the Captive Portal or
Multi-Factor Authentication interface. An unauthenticated, remote attacker can exploit this, via a malicious request
to the Captive Portal or Multi-Factor Authentication interface, to disrupt system processes and potentially execute
arbitrary code.
Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.");
script_set_attribute(attribute:"see_also", value:"https://security.paloaltonetworks.com/CVE-2020-2040");
script_set_attribute(attribute:"solution", value:
"Upgrade to PAN-OS 8.1.15 / 9.0.9 / 9.1.3 or later");
script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C");
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:H/I:H/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-2020-2040");
script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
script_cwe_id(120);
script_set_attribute(attribute:"vuln_publication_date", value:"2020/09/09");
script_set_attribute(attribute:"patch_publication_date", value:"2020/09/09");
script_set_attribute(attribute:"plugin_publication_date", value:"2020/09/11");
script_set_attribute(attribute:"potential_vulnerability", value:"true");
script_set_attribute(attribute:"plugin_type", value:"combined");
script_set_attribute(attribute:"cpe", value:"cpe:/o:paloaltonetworks:pan-os");
script_set_attribute(attribute:"stig_severity", value:"I");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"Palo Alto Local Security Checks");
script_copyright(english:"This script is Copyright (C) 2020-2022 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_dependencies("palo_alto_version.nbin");
script_require_keys("Host/Palo_Alto/Firewall/Version", "Host/Palo_Alto/Firewall/Full_Version", "Host/Palo_Alto/Firewall/Source", "Settings/ParanoidReport");
exit(0);
}
include('vcf.inc');
include('vcf_extras.inc');
vcf::palo_alto::initialize();
app_name = 'Palo Alto Networks PAN-OS';
app_info = vcf::get_app_info(app:app_name, kb_ver:'Host/Palo_Alto/Firewall/Full_Version', kb_source:'Host/Palo_Alto/Firewall/Source');
# Target is only vulnerable if Captive Portal is enabled or Multi-Factor Authentication configured.
if (report_paranoia < 2) audit(AUDIT_PARANOID);
constraints = [
{ 'min_version' : '8.0.0', 'fixed_version' : '8.1.15' },
{ 'min_version' : '9.0.0', 'fixed_version' : '9.0.9' },
{ 'min_version' : '9.1.0', 'fixed_version' : '9.1.3' }
];
vcf::check_version_and_report(app_info:app_info, constraints:constraints, severity:SECURITY_HOLE);
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:L/Au:N/C:C/I:C/A:C
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
AI Score
Confidence
High
EPSS
Percentile
78.0%