7.2 High
CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:L/AC:L/Au:N/C:C/I:C/A:C
7.8 High
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
0.0004 Low
EPSS
Percentile
12.8%
According to its self-reported version, Cisco IOS XR Software is affected by a privilege escalation vulnerability in task group assignment for a specific CLI command due to incorrect mapping to task groups. An attacker could exploit this vulnerability by first authenticating to the local CLI shell on the device and using the CLI command to bypass the task groupโbased checks. A successful exploit could allow the attacker to elevate privileges and gain full administrative control of the device. There are workarounds that address this vulnerability.
Please see the included Cisco BID and Cisco Security Advisory for more information.
#TRUSTED 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
#
# (C) Tenable Network Security, Inc.
#
include('compat.inc');
if (description)
{
script_id(140793);
script_version("1.10");
script_set_attribute(attribute:"plugin_modification_date", value:"2021/09/10");
script_cve_id("CVE-2020-3473");
script_xref(name:"CISCO-BUG-ID", value:"CSCvs12604");
script_xref(name:"CISCO-SA", value:"cisco-sa-iosxr-LJtNFjeN");
script_xref(name:"IAVA", value:"2020-A-0374-S");
script_name(english:"Cisco IOS XR Software Authenticated User Privilege Escalation (cisco-sa-iosxr-LJtNFjeN)");
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 XR Software is affected by a privilege escalation vulnerability in
task group assignment for a specific CLI command due to incorrect mapping to task groups. An attacker could exploit
this vulnerability by first authenticating to the local CLI shell on the device and using the CLI command to bypass
the task groupรขยยbased checks. A successful exploit could allow the attacker to elevate privileges and gain full
administrative control of the device. There are workarounds that address this vulnerability.
Please see the included Cisco BID and Cisco Security Advisory for more information.");
# https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxr-LJtNFjeN
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?9d85a259");
script_set_attribute(attribute:"see_also", value:"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvs12604");
script_set_attribute(attribute:"solution", value:
"Upgrade to the relevant fixed version referenced in Cisco bug ID CSCvs12604");
script_set_cvss_base_vector("CVSS2#AV:L/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:L/AC:L/PR:L/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-2020-3473");
script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
script_cwe_id(264);
script_set_attribute(attribute:"vuln_publication_date", value:"2020/09/02");
script_set_attribute(attribute:"patch_publication_date", value:"2020/09/02");
script_set_attribute(attribute:"plugin_publication_date", value:"2020/09/25");
script_set_attribute(attribute:"plugin_type", value:"combined");
script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ios_xr");
script_set_attribute(attribute:"stig_severity", value:"II");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"CISCO");
script_copyright(english:"This script is Copyright (C) 2020-2021 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_dependencies("cisco_ios_xr_version.nasl", "cisco_enum_smu.nasl");
script_require_keys("Host/Cisco/IOS-XR/Version", "Settings/ParanoidReport");
exit(0);
}
include('ccf.inc');
product_info = cisco::get_product_info(name:'Cisco IOS XR');
if (report_paranoia < 2) audit(AUDIT_PARANOID);
model = get_kb_item('CISCO/model');
if (empty_or_null(model))
model = product_info['model'];
model = toupper(model);
if (model =~ "8[0-9]{3}") // 8000 Series Routers
{
vuln_ranges = [
{ 'min_ver' : '5', 'fix_ver' : '7.0.12' },
{ 'min_ver' : '7.2', 'fix_ver' : '7.2.1' }
];
}
else if ("NCS4K" >< model || model =~ "NCS4[0-9]{3}") // Network Convergence System 4000 Series
{
vuln_ranges = [
{ 'min_ver' : '0', 'fix_ver' : '6.6.3' }
];
smus['6.5.29'] = 'CSCvs12604';
}
else if (
'XRV9K' >< model || model =~ "XRV9[0-9]{3}" || "XRV 9" >< model // IOS XRv 9000 Router
|| 'NCS540' >< model || 'NCS560' >< model // Network Convergence System 540/560 Routers
|| 'NCS55' >< model || model =~ "NCS55[0-9]{2}" // Network Convergence System 5500 Series
|| 'NCS6K' >< model || model =~ "NCS6[0-9]{3}") // Network Convergence System 6000 Series
{
vuln_ranges = [
{ 'min_ver' : '5', 'fix_ver' : '6.6.3' },
{ 'min_ver' : '7.0', 'fix_ver' : '7.0.2' },
{ 'min_ver' : '7.1', 'fix_ver' : '7.1.1' }
];
}
else audit(AUDIT_HOST_NOT, 'an affected model');
reporting = make_array(
'port' , product_info['port'],
'severity' , SECURITY_HOLE,
'version' , product_info['version'],
'bug_id' , 'CSCvs12604',
'disable_caveat', TRUE
);
cisco::check_and_report(
product_info:product_info,
reporting:reporting,
vuln_ranges:vuln_ranges,
smus:smus
);
7.2 High
CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:L/AC:L/Au:N/C:C/I:C/A:C
7.8 High
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
0.0004 Low
EPSS
Percentile
12.8%