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:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
Percentile
77.8%
According to its self-reported version, Cisco IOS XE Software is affected by a denial of service (DoS) vulnerability in the IPv4 fragment reassembly function due to the corruption of an internal data structure that occurs when the affected software reassembles an IPv4 packet. An unauthenticated, remote attacker can exploit this, by sending crafted IPv4 fragments to an affected device, to cause the device to reload and stop responding.
Please see the included Cisco BIDs and Cisco Security Advisory for more information.
Note that Nessus has not tested for this issue but has instead relied only on the application’s self-reported version number.
#TRUSTED 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
#
# (C) Tenable Network Security, Inc.
#
include('compat.inc');
if (description)
{
script_id(130971);
script_version("1.8");
script_set_attribute(attribute:"plugin_modification_date", value:"2021/06/28");
script_cve_id("CVE-2016-6386");
script_bugtraq_id(93202);
script_xref(name:"CISCO-BUG-ID", value:"CSCux66005");
script_xref(name:"CISCO-SA", value:"cisco-sa-20160928-frag");
script_name(english:"Cisco IOS XE Software IP Fragment Reassembly DoS (cisco-sa-20160928-frag)");
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 Software is affected by a denial of service (DoS) vulnerability in
the IPv4 fragment reassembly function due to the corruption of an internal data structure that occurs when the affected
software reassembles an IPv4 packet. An unauthenticated, remote attacker can exploit this, by sending crafted IPv4
fragments to an affected device, to cause the device to reload and stop responding.
Please see the included Cisco BIDs and Cisco Security Advisory for more information.
Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
# https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160928-frag
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?62f9a0ef");
script_set_attribute(attribute:"see_also", value:"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCux66005");
script_set_attribute(attribute:"solution", value:
"Upgrade to the relevant fixed version referenced in Cisco bug ID(s) CSCux66005.");
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-2016-6386");
script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
script_set_attribute(attribute:"vuln_publication_date", value:"2016/10/05");
script_set_attribute(attribute:"patch_publication_date", value:"2016/09/28");
script_set_attribute(attribute:"plugin_publication_date", value:"2019/11/14");
script_set_attribute(attribute:"plugin_type", value:"combined");
script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ios_xe");
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_ios_xe_version.nasl");
script_require_keys("Host/Cisco/IOS-XE/Version");
exit(0);
}
include('audit.inc');
include('cisco_workarounds.inc');
include('ccf.inc');
product_info = cisco::get_product_info(name:'Cisco IOS XE Software');
# Only 64 bit devices are affected
show_ver = get_kb_item('Host/Cisco/show_ver');
sys_desc = get_kb_item('SNMP/sysDesc');
if ('X86_64' >!< show_ver && 'X86_64' >!< sys_desc)
audit(AUDIT_HOST_NOT, 'affected');
version_list = make_list(
'3.2.0SG',
'3.2.1SG',
'3.2.2SG',
'3.2.3SG',
'3.2.4SG',
'3.2.5SG',
'3.2.6SG',
'3.2.7SG',
'3.2.8SG',
'3.2.9SG',
'3.2.10SG',
'3.7.0S',
'3.7.1S',
'3.7.2S',
'3.7.3S',
'3.7.4S',
'3.7.5S',
'3.7.6S',
'3.7.7S',
'3.7.8S',
'3.7.4aS',
'3.7.2tS',
'3.7.0bS',
'3.7.1aS',
'3.3.0SG',
'3.3.2SG',
'3.3.1SG',
'3.8.0S',
'3.8.1S',
'3.8.2S',
'3.9.1S',
'3.9.0S',
'3.9.2S',
'3.9.0xaS',
'3.9.1aS',
'3.9.0aS',
'3.2.0SE',
'3.2.1SE',
'3.2.2SE',
'3.2.3SE',
'3.3.0SE',
'3.3.1SE',
'3.3.2SE',
'3.3.3SE',
'3.3.4SE',
'3.3.5SE',
'3.3.0XO',
'3.3.1XO',
'3.3.2XO',
'3.4.0SG',
'3.4.2SG',
'3.4.1SG',
'3.4.3SG',
'3.4.4SG',
'3.4.5SG',
'3.4.6SG',
'3.4.7SG',
'3.5.0E',
'3.5.1E',
'3.5.2E',
'3.5.3E',
'3.10.0S',
'3.10.1S',
'3.10.2S',
'3.10.3S',
'3.10.4S',
'3.10.5S',
'3.10.6S',
'3.10.2aS',
'3.10.2tS',
'3.10.7S',
'3.10.1xbS',
'3.11.1S',
'3.11.2S',
'3.11.0S',
'3.11.3S',
'3.11.4S',
'3.12.0S',
'3.12.1S',
'3.12.2S',
'3.12.3S',
'3.12.0aS',
'3.12.4S',
'3.13.0S',
'3.13.1S',
'3.13.2S',
'3.13.3S',
'3.13.4S',
'3.13.2aS',
'3.13.0aS',
'3.6.0E',
'3.6.1E',
'3.6.0aE',
'3.6.0bE',
'3.6.2aE',
'3.6.2E',
'3.6.3E',
'3.6.4E',
'3.14.0S',
'3.14.1S',
'3.14.2S',
'3.14.3S',
'3.14.4S',
'3.15.0S',
'3.15.1S',
'3.15.2S',
'3.15.1cS',
'3.15.2xbS',
'3.3.0SQ',
'3.3.1SQ',
'3.4.0SQ',
'3.4.1SQ',
'3.7.0E',
'3.7.1E',
'3.7.2E',
'3.7.3E',
'3.5.0SQ',
'3.5.1SQ',
'3.5.2SQ',
'3.5.3SQ',
'3.5.4SQ',
'3.5.5SQ',
'3.5.6SQ',
'3.16.0S',
'3.16.1S',
'3.16.0aS',
'3.16.1aS',
'3.16.0cS',
'3.17.0S',
'16.1.1',
'16.1.2',
'16.1.3',
'3.2.0JA',
'3.8.0E',
'3.8.1E',
'3.18.3bSP'
);
reporting = make_array(
'port' , product_info['port'],
'severity' , SECURITY_HOLE,
'version' , product_info['version'],
'bug_id' , 'CSCux66005',
'cmds' , make_list('show version'),
'disable_caveat', TRUE
);
cisco::check_and_report(product_info:product_info, reporting:reporting, 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:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
Percentile
77.8%