CVE-2019-1909

Cisco IOS XR Software Border Gateway Protocol Denial of Service Vulnerability

Severity Score

5.9

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Track

*SSVC

Descriptions

A vulnerability in the implementation of Border Gateway Protocol (BGP) functionality in Cisco IOS XR Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected system. The vulnerability is due to incorrect processing of certain BGP update messages. An attacker could exploit this vulnerability by sending BGP update messages that include a specific set of attributes to be processed by an affected system. A successful exploit could allow the attacker to cause the BGP process to restart unexpectedly, resulting in a DoS condition. The Cisco implementation of BGP accepts incoming BGP traffic from explicitly defined peers only. To exploit this vulnerability, the malicious BGP update message would need to come from a configured, valid BGP peer or would need to be injected by the attacker into the victim's BGP network on an existing, valid TCP connection to a BGP peer.

Una vulnerabilidad en la implementación de la funcionalidad Border Gateway Protocol (BGP) en el software IOS XR de Cisco, podría permitir a un atacante remoto no autenticado causar una condición de denegación de servicio (DoS) en un sistema afectado. La vulnerabilidad es debido al procesamiento incorrecto de ciertos mensajes de actualización de BGP. Un atacante podría explotar esta vulnerabilidad mediante el envío mensajes de actualización de BGP que incluyan un conjunto específico de atributos para ser procesados ??por un sistema afectado. Una operación con éxito podría permitir que el atacante cause que el proceso BGP se reinicie inesperadamente, resultando en una condición de DoS. La implementación de BGP de Cisco acepta el tráfico BGP entrante solamente de peers explícitamente definidos. Para aprovechar esta vulnerabilidad, el mensaje malicioso de actualización de BGP debería provenir de un peer BGP configurado y válido o el atacante necesitaría inyectarlo hacia la red de BGP de la víctima en una conexión TCP válida existente a un peer de BGP.

*Credits: N/A

CVSS Scores

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:Track

Exploitation

None

Automatable

Tech. Impact

Partial

* Organization's Worst-case Scenario

Timeline

2018-12-06 CVE Reserved
2019-07-06 CVE Published
2023-03-07 EPSS Updated
2024-11-21 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-20: Improper Input Validation

CAPEC

References (1)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190703-iosxr-bgp-dos	2019-10-09

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Cisco Search vendor "Cisco"	Ios Xr Search vendor "Cisco" for product "Ios Xr"	>= 4.3.1 < 6.6.2 Search vendor "Cisco" for product "Ios Xr" and version " >= 4.3.1 < 6.6.2"	-	Affected	in	Cisco Search vendor "Cisco"	Asr 9001 Search vendor "Cisco" for product "Asr 9001"	-	-	Safe
Cisco Search vendor "Cisco"	Ios Xr Search vendor "Cisco" for product "Ios Xr"	>= 4.3.1 < 6.6.2 Search vendor "Cisco" for product "Ios Xr" and version " >= 4.3.1 < 6.6.2"	-	Affected	in	Cisco Search vendor "Cisco"	Asr 9006 Search vendor "Cisco" for product "Asr 9006"	-	-	Safe
Cisco Search vendor "Cisco"	Ios Xr Search vendor "Cisco" for product "Ios Xr"	>= 4.3.1 < 6.6.2 Search vendor "Cisco" for product "Ios Xr" and version " >= 4.3.1 < 6.6.2"	-	Affected	in	Cisco Search vendor "Cisco"	Asr 9010 Search vendor "Cisco" for product "Asr 9010"	-	-	Safe
Cisco Search vendor "Cisco"	Ios Xr Search vendor "Cisco" for product "Ios Xr"	>= 4.3.1 < 6.6.2 Search vendor "Cisco" for product "Ios Xr" and version " >= 4.3.1 < 6.6.2"	-	Affected	in	Cisco Search vendor "Cisco"	Asr 9901 Search vendor "Cisco" for product "Asr 9901"	-	-	Safe
Cisco Search vendor "Cisco"	Ios Xr Search vendor "Cisco" for product "Ios Xr"	>= 4.3.1 < 6.6.2 Search vendor "Cisco" for product "Ios Xr" and version " >= 4.3.1 < 6.6.2"	-	Affected	in	Cisco Search vendor "Cisco"	Asr 9904 Search vendor "Cisco" for product "Asr 9904"	-	-	Safe
Cisco Search vendor "Cisco"	Ios Xr Search vendor "Cisco" for product "Ios Xr"	>= 4.3.1 < 6.6.2 Search vendor "Cisco" for product "Ios Xr" and version " >= 4.3.1 < 6.6.2"	-	Affected	in	Cisco Search vendor "Cisco"	Asr 9906 Search vendor "Cisco" for product "Asr 9906"	-	-	Safe
Cisco Search vendor "Cisco"	Ios Xr Search vendor "Cisco" for product "Ios Xr"	>= 4.3.1 < 6.6.2 Search vendor "Cisco" for product "Ios Xr" and version " >= 4.3.1 < 6.6.2"	-	Affected	in	Cisco Search vendor "Cisco"	Asr 9910 Search vendor "Cisco" for product "Asr 9910"	-	-	Safe
Cisco Search vendor "Cisco"	Ios Xr Search vendor "Cisco" for product "Ios Xr"	>= 4.3.1 < 6.6.2 Search vendor "Cisco" for product "Ios Xr" and version " >= 4.3.1 < 6.6.2"	-	Affected	in	Cisco Search vendor "Cisco"	Asr 9912 Search vendor "Cisco" for product "Asr 9912"	-	-	Safe
Cisco Search vendor "Cisco"	Ios Xr Search vendor "Cisco" for product "Ios Xr"	>= 4.3.1 < 6.6.2 Search vendor "Cisco" for product "Ios Xr" and version " >= 4.3.1 < 6.6.2"	-	Affected	in	Cisco Search vendor "Cisco"	Asr 9920 Search vendor "Cisco" for product "Asr 9920"	-	-	Safe