CVE-2018-0421

Cisco Prime Access Registrar Denial of Service Vulnerability

Severity Score

8.6

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

A vulnerability in TCP connection management in Cisco Prime Access Registrar could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition when the application unexpectedly restarts. The vulnerability is due to incorrect handling of incoming TCP SYN packets to specific listening ports. The improper handling of the TCP SYN packets could cause a system file description to be allocated and not freed. An attacker could exploit this vulnerability by sending a crafted stream of TCP SYN packets to the application. A successful exploit could allow the attacker to cause the application to eventually restart if a file description cannot be obtained.

Una vulnerabilidad en la administración de las conexiones TCP en Cisco Prime Access Registrar podría permitir que un atacante remoto sin autenticar provoque una denegación de servicio (DoS) cuando la aplicación se reinicia de manera inesperada. Esta vulnerabilidad se debe al manejo incorrecto de los paquetes TCP SYN en puertos de escucha específicos. El manejo incorrecto de los paquetes TCP SYN podría provocar que se asigne y no se libere una descripción de un archivo del sistema. Un atacante podría explotar esta vulnerabilidad enviando un flujo manipulado de paquetes TCP SYN a la aplicación. Su explotación con éxito podría permitir que el atacante provoque que la aplicación acabe por reiniciarse si no se puede obtener una descripción de archivo.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2017-11-27 CVE Reserved
2018-10-05 CVE Published
2024-06-20 EPSS Updated
2024-09-16 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-399: Resource Management Errors
CWE-772: Missing Release of Resource after Effective Lifetime

CAPEC

References (3)

URL	Tag	Source
http://www.securityfocus.com/bid/105282	Third Party Advisory
http://www.securitytracker.com/id/1041684	Third Party Advisory

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180905-cpar-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"		Prime Access Registrar Search vendor "Cisco" for product "Prime Access Registrar"				>= 7.3 < 7.3.0.4 Search vendor "Cisco" for product "Prime Access Registrar" and version " >= 7.3 < 7.3.0.4"		-		Affected
Cisco Search vendor "Cisco"		Prime Access Registrar Search vendor "Cisco" for product "Prime Access Registrar"				>= 8.0 < 8.0.1.1 Search vendor "Cisco" for product "Prime Access Registrar" and version " >= 8.0 < 8.0.1.1"		-		Affected
Cisco Search vendor "Cisco"		Prime Access Registrar Jumpstart Search vendor "Cisco" for product "Prime Access Registrar Jumpstart"				>= 7.3 < 7.3.0.4 Search vendor "Cisco" for product "Prime Access Registrar Jumpstart" and version " >= 7.3 < 7.3.0.4"		-		Affected
Cisco Search vendor "Cisco"		Prime Access Registrar Jumpstart Search vendor "Cisco" for product "Prime Access Registrar Jumpstart"				>= 8.0 < 8.0.1.1 Search vendor "Cisco" for product "Prime Access Registrar Jumpstart" and version " >= 8.0 < 8.0.1.1"		-		Affected