CVSS2
Attack Vector
ADJACENT_NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
AV:A/AC:L/Au:N/C:N/I:N/A:C
CVSS3
Attack Vector
ADJACENT
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
EPSS
Percentile
29.0%
According to its self-reported version, Cisco IOS XR Software is affected by following vulnerability
Please see the included Cisco BIDs and Cisco Security Advisory for more information
#TRUSTED 951376dd01fd5e4abf416b23d89ca88943c59405dd905508d0811d86fc676f83b3be8d39c7343caff0bb37f88b148a29731083f2c43700d41b957e6bd2f0085e361d15ebce89f8d58381fbdf1f04f08bf244151cee373c061e9ddc672670eb7a5a08ade5c1669eb8b5775893c99dbce4bc60f30fff85effcf737efd5e208fcad2efb7de400c92c2711cea223736f906cc15610904dd6147828c6d3bbbac65229e2833ea16199dbff8946772f07514ac3433cb2b89e75a4931f95856731f77ca4388e24059399c9cc84f1cdfc46627bf30b2cd1390515ee83de68da18861e3bfc551b3c16e24d0710ff2278d856422d007515663d2a2271108b143bfa8c8b7abec2184cebc0b36e924a6f978960bfaa3d029c0f15fb1aa457d1ebb7f2c665c73653b5fae431fd6fd162f661d7bc5520216a8db31904bc268cf9dc624b560996ce394f7a423f2278a0a3ff9d79d56a39f974dff74c1ae94fe137fdd799f5563123d4d3f6f8d7be60036b7ecbe2873aa9eb7ca565713fdec4f2d8329b44b09156b1d3a030727b3a1e7d50ef89505d170670aae3ceac41d9aebc1fba9ae7fae1b19239dc0369c9d68d0e45538e1bc5e38d1fbe34d6e2cbe5482e36c4310675e1c4c76ba40b8894330487d6f9a0a1bdc57b313947492a46eecadbff7232d809a4574f20be0dd91ccac184ebfd45806ce7bd04db1e051d3e28336c0c48e24609c908d2
#
# (C) Tenable Network Security, Inc.
#
include("compat.inc");
if (description)
{
script_id(128769);
script_version("1.8");
script_set_attribute(attribute:"plugin_modification_date", value:"2021/04/28");
script_cve_id("CVE-2019-1846");
script_bugtraq_id(108363);
script_xref(name:"CISCO-BUG-ID", value:"CSCvk63685");
script_xref(name:"CISCO-SA", value:"cisco-sa-20190515-iosxr-mpls-dos");
script_name(english:"Cisco IOS XR Software for Cisco ASR 9000 Series Aggregation Services Routers MPLS OAM Denial of Service Vulnerability");
script_summary(english:"Checks the version of Cisco IOS XR Software");
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 following vulnerability
- A vulnerability in the Multiprotocol Label Switching
(MPLS) Operations, Administration, and Maintenance (OAM)
implementation of Cisco IOS XR Software for Cisco ASR
9000 Series Aggregation Services Routers could allow an
unauthenticated, adjacent attacker to trigger a denial
of service (DoS) condition on an affected device.The
vulnerability is due to the incorrect handling of
certain MPLS OAM packets. An attacker could exploit this
vulnerability by sending malicious MPLS OAM packets to
an affected device. A successful exploit could allow the
attacker to cause the lspv_server process to crash. The
crash could lead to system instability and the inability
to process or forward traffic though the device,
resulting in a DoS condition that require manual
intervention to restore normal operating conditions.
Please see the included Cisco BIDs and Cisco Security Advisory for
more information");
# https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190515-iosxr-mpls-dos
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?4d35f409");
script_set_attribute(attribute:"see_also", value:"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvk63685");
script_set_attribute(attribute:"solution", value:
"Upgrade to the relevant fixed version referenced in Cisco bug ID
CSCvk63685");
script_set_cvss_base_vector("CVSS2#AV:A/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:A/AC:L/PR:N/UI:N/S:C/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-2019-1846");
script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
script_cwe_id(20);
script_set_attribute(attribute:"vuln_publication_date", value:"2019/05/15");
script_set_attribute(attribute:"patch_publication_date", value:"2019/05/15");
script_set_attribute(attribute:"plugin_publication_date", value:"2019/09/13");
script_set_attribute(attribute:"plugin_type", value:"combined");
script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ios_xr");
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_xr_version.nasl");
script_require_keys("Host/Cisco/IOS-XR/Version", "Settings/ParanoidReport");
exit(0);
}
include("ccf.inc");
include("cisco_workarounds.inc");
product_info = cisco::get_product_info(name:'Cisco IOS XR');
if (report_paranoia < 2)
audit(AUDIT_PARANOID);
version_list = make_list('5.3.3');
workarounds = make_list(CISCO_WORKAROUNDS['generic_workaround']);
workaround_params = WORKAROUND_CONFIG['mpls-oam'];
reporting = make_array(
'port' , product_info['port'],
'severity' , SECURITY_WARNING,
'version' , product_info['version'],
'bug_id' , 'CSCvk63685'
);
cisco::check_and_report(
product_info:product_info,
workarounds:workarounds,
workaround_params:workaround_params,
reporting:reporting,
vuln_versions:version_list,
router_only: TRUE
);
CVSS2
Attack Vector
ADJACENT_NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
AV:A/AC:L/Au:N/C:N/I:N/A:C
CVSS3
Attack Vector
ADJACENT
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
EPSS
Percentile
29.0%