Details of VAR-202008-0815

ID

VAR-202008-0815

CVE

CVE-2020-3449

TITLE

Cisco IOS XR Software vulnerabilities related to checking exceptional conditions

Trust: 0.8

sources: JVNDB: JVNDB-2020-009560

DESCRIPTION

A vulnerability in the Border Gateway Protocol (BGP) additional paths feature of Cisco IOS XR Software could allow an unauthenticated, remote attacker to prevent authorized users from monitoring the BGP status and cause the BGP process to stop processing new updates, resulting in a denial of service (DOS) condition. The vulnerability is due to an incorrect calculation of lexicographical order when displaying additional path information within Cisco IOS XR Software, which causes an infinite loop. An attacker could exploit this vulnerability by sending a specific BGP update from a BGP neighbor peer session of an affected device; an authorized user must then issue a show bgp command for the vulnerability to be exploited. A successful exploit could allow the attacker to prevent authorized users from properly monitoring the BGP status and prevent BGP from processing new updates, resulting in outdated information in the routing and forwarding tables. Cisco IOS XR is an operating system developed by Cisco for its network equipment

Trust: 1.71

sources: NVD: CVE-2020-3449 // JVNDB: JVNDB-2020-009560 // VULHUB: VHN-181574

AFFECTED PRODUCTS

vendor:	cisco	model:	ios xr	scope:	gte	version:	7.3.0	Trust: 1.0
vendor:	cisco	model:	ios xr	scope:	gte	version:	7.2.0	Trust: 1.0
vendor:	cisco	model:	ios xr	scope:	lt	version:	7.1.2	Trust: 1.0
vendor:	cisco	model:	ios xr	scope:	lt	version:	7.2.1	Trust: 1.0
vendor:	cisco	model:	ios xr	scope:	lt	version:	7.3.1	Trust: 1.0
vendor:	cisco	model:	ios xr	scope:	-	version:	-	Trust: 0.8

sources: JVNDB: JVNDB-2020-009560 // NVD: CVE-2020-3449

CVSS

SEVERITY

CVSSV2

CVSSV3

nvd@nist.gov:	CVE-2020-3449
value:	MEDIUM
Trust: 1.0
ykramarz@cisco.com:	CVE-2020-3449
value:	MEDIUM
Trust: 1.0
NVD:	JVNDB-2020-009560
value:	MEDIUM
Trust: 0.8
CNNVD:	CNNVD-202008-142
value:	MEDIUM
Trust: 0.6
VULHUB:	VHN-181574
value:	MEDIUM
Trust: 0.1

nvd@nist.gov:	CVE-2020-3449
severity:	MEDIUM
baseScore:	4.3
vectorString:	AV:N/AC:M/AU:N/C:N/I:N/A:P
accessVector:	NETWORK
accessComplexity:	MEDIUM
authentication:	NONE
confidentialityImpact:	NONE
integrityImpact:	NONE
availabilityImpact:	PARTIAL
exploitabilityScore:	8.6
impactScore:	2.9
acInsufInfo:	NONE
obtainAllPrivilege:	NONE
obtainUserPrivilege:	NONE
obtainOtherPrivilege:	NONE
userInteractionRequired:	NONE
version:	2.0
Trust: 1.0
NVD:	JVNDB-2020-009560
severity:	MEDIUM
baseScore:	4.3
vectorString:	AV:N/AC:M/AU:N/C:N/I:N/A:P
accessVector:	NETWORK
accessComplexity:	MEDIUM
authentication:	NONE
confidentialityImpact:	NONE
integrityImpact:	NONE
availabilityImpact:	PARTIAL
exploitabilityScore:	NONE
impactScore:	NONE
acInsufInfo:	NONE
obtainAllPrivilege:	NONE
obtainUserPrivilege:	NONE
obtainOtherPrivilege:	NONE
userInteractionRequired:	NONE
version:	2.0
Trust: 0.8
VULHUB:	VHN-181574
severity:	MEDIUM
baseScore:	4.3
vectorString:	AV:N/AC:M/AU:N/C:N/I:N/A:P
accessVector:	NETWORK
accessComplexity:	MEDIUM
authentication:	NONE
confidentialityImpact:	NONE
integrityImpact:	NONE
availabilityImpact:	PARTIAL
exploitabilityScore:	8.6
impactScore:	2.9
acInsufInfo:	NONE
obtainAllPrivilege:	NONE
obtainUserPrivilege:	NONE
obtainOtherPrivilege:	NONE
userInteractionRequired:	NONE
version:	2.0
Trust: 0.1

nvd@nist.gov:	CVE-2020-3449
baseSeverity:	MEDIUM
baseScore:	4.3
vectorString:	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
attackVector:	NETWORK
attackComplexity:	LOW
privilegesRequired:	NONE
userInteraction:	REQUIRED
scope:	UNCHANGED
confidentialityImpact:	NONE
integrityImpact:	NONE
availabilityImpact:	LOW
exploitabilityScore:	2.8
impactScore:	1.4
version:	3.1
Trust: 2.0
NVD:	JVNDB-2020-009560
baseSeverity:	MEDIUM
baseScore:	4.3
vectorString:	CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
attackVector:	NETWORK
attackComplexity:	LOW
privilegesRequired:	NONE
userInteraction:	REQUIRED
scope:	UNCHANGED
confidentialityImpact:	NONE
integrityImpact:	NONE
availabilityImpact:	LOW
exploitabilityScore:	NONE
impactScore:	NONE
version:	3.0
Trust: 0.8

sources: VULHUB: VHN-181574 // JVNDB: JVNDB-2020-009560 // CNNVD: CNNVD-202008-142 // NVD: CVE-2020-3449 // NVD: CVE-2020-3449

PROBLEMTYPE DATA

problemtype:

CWE-754

Trust: 1.9

sources: VULHUB: VHN-181574 // JVNDB: JVNDB-2020-009560 // NVD: CVE-2020-3449

THREAT TYPE

remote

Trust: 0.6

sources: CNNVD: CNNVD-202008-142

TYPE

code problem

Trust: 0.6

sources: CNNVD: CNNVD-202008-142

CONFIGURATIONS

sources: JVNDB: JVNDB-2020-009560

PATCH

title:	cisco-sa-bgp-ErKEqAer	url:	https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-bgp-ErKEqAer	Trust: 0.8
title:	Cisco IOS XR Fixes for code issue vulnerabilities	url:	http://www.cnnvd.org.cn/web/xxk/bdxqById.tag?id=125484	Trust: 0.6

sources: JVNDB: JVNDB-2020-009560 // CNNVD: CNNVD-202008-142

EXTERNAL IDS

db:	NVD	id:	CVE-2020-3449	Trust: 2.5
db:	JVNDB	id:	JVNDB-2020-009560	Trust: 0.8
db:	CNNVD	id:	CNNVD-202008-142	Trust: 0.7
db:	AUSCERT	id:	ESB-2020.2702	Trust: 0.6
db:	CNVD	id:	CNVD-2020-44862	Trust: 0.1
db:	VULHUB	id:	VHN-181574	Trust: 0.1

sources: VULHUB: VHN-181574 // JVNDB: JVNDB-2020-009560 // CNNVD: CNNVD-202008-142 // NVD: CVE-2020-3449

REFERENCES

url:	https://tools.cisco.com/security/center/content/ciscosecurityadvisory/cisco-sa-bgp-erkeqaer	Trust: 1.7
url:	https://nvd.nist.gov/vuln/detail/cve-2020-3449	Trust: 1.4
url:	https://cve.mitre.org/cgi-bin/cvename.cgi?name=cve-2020-3449	Trust: 0.8
url:	https://www.auscert.org.au/bulletins/esb-2020.2702/	Trust: 0.6
url:	https://vigilance.fr/vulnerability/cisco-ios-xr-denial-of-service-via-bgp-33018	Trust: 0.6

sources: VULHUB: VHN-181574 // JVNDB: JVNDB-2020-009560 // CNNVD: CNNVD-202008-142 // NVD: CVE-2020-3449

SOURCES

db:	VULHUB	id:	VHN-181574
db:	JVNDB	id:	JVNDB-2020-009560
db:	CNNVD	id:	CNNVD-202008-142
db:	NVD	id:	CVE-2020-3449

LAST UPDATE DATE

2024-08-14T14:44:45.569000+00:00

SOURCES UPDATE DATE

db:	VULHUB	id:	VHN-181574	date:	2020-08-20T00:00:00
db:	JVNDB	id:	JVNDB-2020-009560	date:	2020-11-13T07:06:37
db:	CNNVD	id:	CNNVD-202008-142	date:	2020-08-21T00:00:00
db:	NVD	id:	CVE-2020-3449	date:	2023-11-07T03:22:43.890

SOURCES RELEASE DATE

db:	VULHUB	id:	VHN-181574	date:	2020-08-17T00:00:00
db:	JVNDB	id:	JVNDB-2020-009560	date:	2020-11-13T07:06:37
db:	CNNVD	id:	CNNVD-202008-142	date:	2020-08-05T00:00:00
db:	NVD	id:	CVE-2020-3449	date:	2020-08-17T18:15:13.477