CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
AV:N/AC:L/Au:N/C:N/I:N/A:C
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 IOS XE SD-WAN Software is affected by a denial of service vulnerability due to insufficient handling of malformed packets. An unauthenticated, remote attacker can exploit this by sending crafted traffic to an affected device, which could allow the attacker to cause the device to reload, resulting in a DoS condition.
Please see the included Cisco BIDs and Cisco Security Advisory for more information.
#TRUSTED 54dcfa245abab080113eedce88fad996a323bf44ec99f02a9169762144d9291a318a063973a89b304aa1f68d69559418bbd900b4c1dd077b1aa143ff3bf9b7517a79857987e6bb479480acb29c376537fae069f68092f723ce34dd99dd257cb5d42ae2c009113622026faf685efb0ca2bdc0e22dcaf0ed624b11037d6f9c5f04b2efa1842fac43029118ee5d0c0c33fdc89b467742e995065f5cfaee0c32b7ae87c17e2e3c2be6b62550c9785eea6ece8df1d39bb79adf4e8fbe1116df0ab8b9620beae6d747195c9d8076ea4126900453b9bbf8c8fec06b304c6fc453fa63869724e293fe3eb95784fbb27116f11fda2670ccb2cdd7ca59faf0f2d1a2e66bce35e43202cadadaab2916567ab10cd87f304363d9eab087b3cbd18cfb201da0d334794a4133ec6cbfd0555d18053121016f199b76a7f257caab3efeea2f6fbbe6af30872e25f0bece50e1aeca2cb4225aa5d351485d0858db71fa2694e285f568e024b39cc7e2aeed598468f5eb7e7bd02cb5d693f6659d6caffd5957fad2840804c46d6fdf630db732221428ec163ef20a4d267fc09d7c507f74425441bfdb2e76261ee8f28c4396635595056d3637d5d066359cf3abfd75e9eb9e63829f0fd1b2f502f8f3cfe8e2b04ac84eabae1cb7f5f2db8bd2541a7738e579655531aefb2eb5d58ab92aa85b8e8ddbb78d928e9d91085463a69ad35f78b6dde31d10cbbe
##
# (C) Tenable Network Security, Inc.
##
include('compat.inc');
if (description)
{
script_id(148327);
script_version("1.6");
script_set_attribute(attribute:"plugin_modification_date", value:"2021/09/24");
script_cve_id("CVE-2021-1431");
script_xref(name:"IAVA", value:"2021-A-0141-S");
script_xref(name:"CISCO-BUG-ID", value:"CSCvu95283");
script_xref(name:"CISCO-SA", value:"cisco-sa-iosxe-sdwdos-4zeEeC9w");
script_name(english:"Cisco IOS XE Software SD WAN vDaemon DoS (cisco-sa-iosxe-sdwdos-4zeEeC9w)");
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 IOS XE SD-WAN Software is affected by a denial of service vulnerability
due to insufficient handling of malformed packets. An unauthenticated, remote attacker can exploit this by sending
crafted traffic to an affected device, which could allow the attacker to cause the device to reload, resulting in a DoS
condition.
Please see the included Cisco BIDs and Cisco Security Advisory for more information.");
# https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-sdwdos-4zeEeC9w
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?0e861716");
script_set_attribute(attribute:"see_also", value:"http://tools.cisco.com/security/center/viewErp.x?alertId=ERP-74408");
script_set_attribute(attribute:"see_also", value:"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvu95283");
script_set_attribute(attribute:"solution", value:
"Upgrade to the relevant fixed version referenced in Cisco bug ID CSCvu95283");
script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/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: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-2021-1431");
script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
script_cwe_id(20);
script_set_attribute(attribute:"vuln_publication_date", value:"2021/03/24");
script_set_attribute(attribute:"patch_publication_date", value:"2021/03/24");
script_set_attribute(attribute:"plugin_publication_date", value:"2021/04/06");
script_set_attribute(attribute:"plugin_type", value:"combined");
script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ios_xe");
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) 2021 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_dependencies("cisco_ios_xe_version.nasl");
script_require_keys("Host/Cisco/SDWAN/Version");
exit(0);
}
include('ccf.inc');
include('cisco_workarounds.inc');
product_info = cisco::get_product_info(name:'Cisco IOS XE SD-WAN Software');
var sdwan = get_kb_item('Host/Cisco/SDWAN/Version');
var model_check = tolower(product_info['model']);
#Model checking for IOS XE SDWAN model
if(model_check !~ "^[aci]sr[14][0-9]{3}v?")
audit(AUDIT_HOST_NOT, 'affected');
if(sdwan !~ "([0-9]\.)+")
audit(AUDIT_HOST_NOT, 'affected');
version_list=make_list(
'3.15.1xbS',
'3.15.2xbS',
'16.11.1',
'16.11.1a',
'16.11.1b',
'16.11.1c',
'16.11.1s',
'16.11.2',
'16.12.1',
'16.12.1a',
'16.12.1c',
'16.12.1s',
'16.12.1t',
'16.12.1w',
'16.12.1x',
'16.12.1y',
'16.12.1z',
'16.12.2',
'16.12.2a',
'16.12.2s',
'16.12.2t',
'16.12.3',
'16.12.3a',
'16.12.3s',
'16.12.4',
'16.12.4a',
'17.2.1',
'17.2.1a',
'17.2.1r',
'17.2.1v',
'17.2.2'
);
workarounds = make_list(CISCO_WORKAROUNDS['show_version']);
workaround_params = {'pat' : "Router operating mode: Controller-Managed"};
reporting = make_array(
'port' , product_info['port'],
'severity' , SECURITY_HOLE,
'version' , product_info['version'],
'cmds' , make_list('show version'),
'bug_id' , 'CSCvu95283'
);
cisco::check_and_report(
product_info:product_info,
reporting:reporting,
workarounds : workarounds,
workaround_params:workaround_params,
vuln_versions:version_list
);
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
AV:N/AC:L/Au:N/C:N/I:N/A:C
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%