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, the SIP inspection process of Cisco Firepower Threat Defense (FTD) Software is affected by denial of service vulnerability due to a watchdog timeout and crash during the cleanup of threads that are associated with a SIP connection that is being deleted from the connection list. An unauthenticated, remote attacker can exploit this by sending a high rate of crafted SIP traffic through an affected device. A successful exploit could allow the attacker to cause a watchdog timeout and crash, resulting in a crash and reload of the affected device.
Please see the included Cisco BID 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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
#%NASL_MIN_LEVEL 70300
##
# (C) Tenable Network Security, Inc.
##
include('deprecated_nasl_level.inc');
include('compat.inc');
if (description)
{
script_id(149355);
script_version("1.4");
script_set_attribute(attribute:"plugin_modification_date", value:"2021/05/10");
script_cve_id("CVE-2020-3555");
script_xref(name:"CISCO-BUG-ID", value:"CSCvu15801");
script_xref(name:"CISCO-SA", value:"cisco-sa-asaftd-sipdos-3DGvdjvg");
script_name(english:"Cisco Firepower Threat Defense Software SIP DoS (cisco-sa-asaftd-sipdos-3DGvdjvg)");
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, the SIP inspection process of Cisco Firepower Threat Defense (FTD) Software is
affected by denial of service vulnerability due to a watchdog timeout and crash during the cleanup of threads that are
associated with a SIP connection that is being deleted from the connection list. An unauthenticated, remote attacker can
exploit this by sending a high rate of crafted SIP traffic through an affected device. A successful exploit could allow
the attacker to cause a watchdog timeout and crash, resulting in a crash and reload of the affected device.
Please see the included Cisco BID 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-asaftd-sipdos-3DGvdjvg
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?421e590f");
script_set_attribute(attribute:"see_also", value:"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvu15801");
script_set_attribute(attribute:"solution", value:
"Upgrade to the relevant fixed version referenced in Cisco bug ID CSCvu15801");
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-2020-3555");
script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
script_cwe_id(404);
script_set_attribute(attribute:"vuln_publication_date", value:"2020/10/21");
script_set_attribute(attribute:"patch_publication_date", value:"2020/10/21");
script_set_attribute(attribute:"plugin_publication_date", value:"2021/05/07");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:firepower_threat_defense");
script_set_attribute(attribute:"cpe", value:"cpe:/a:cisco:firepower_threat_defense");
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_enumerate_firepower.nbin");
script_require_keys("installed_sw/Cisco Firepower Threat Defense");
exit(0);
}
include('ccf.inc');
include('cisco_workarounds.inc');
var product_info = cisco::get_product_info(name:'Cisco Firepower Threat Defense');
var vuln_ranges = [
{'min_ver': '0.0', 'fix_ver': '6.3.0.6'},
{'min_ver': '6.4.0', 'fix_ver': '6.4.0.10'},
{'min_ver': '6.5.0', 'fix_ver': '6.5.0.5'},
{'min_ver': '6.6.0', 'fix_ver': '6.6.1'}
];
var is_ftd_cli = get_kb_item_or_exit("Host/Cisco/Firepower/is_ftd_cli");
var workarounds, extra, cmds, workaround_params;
if (!is_ftd_cli)
{
if (report_paranoia < 2)
audit(AUDIT_PARANOID);
workarounds = make_list();
extra = 'Note that Nessus was unable to check for workarounds';
}
else
{
workarounds = make_list(CISCO_WORKAROUNDS['generic_workaround']);
workaround_params = WORKAROUND_CONFIG['sip_inspection'];
cmds = make_list('show service-policy');
}
var reporting = make_array(
'port' , 0,
'severity' , SECURITY_HOLE,
'version' , product_info['version'],
'bug_id' , 'CSCvu15801',
'extra' , extra
);
if (max_index(cmds) > 0)
reporting['cmds'] = cmds;
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
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%