CVE-2018-0476

Cisco IOS XE Software NAT Session Initiation Protocol Application Layer Gateway 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

*SSVC

Descriptions

A vulnerability in the Network Address Translation (NAT) Session Initiation Protocol (SIP) Application Layer Gateway (ALG) of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload. The vulnerability is due to improper processing of SIP packets in transit while NAT is performed on an affected device. An unauthenticated, remote attacker could exploit this vulnerability by sending crafted SIP packets via UDP port 5060 through an affected device that is performing NAT for SIP packets. A successful exploit could allow an attacker to cause the device to reload, resulting in a denial of service (DoS) condition.

Una vulnerabilidad en Network Address Translation (NAT) Session Initiation Protocol (SIP) Application Layer Gateway (ALG) de Cisco IOS XE Software podría permitir que un atacante remoto no autenticado provoque el reinicio del dispositivo afectado. La vulnerabilidad se debe al procesamiento incorrecto de paquetes SIP en tránsito mientras se realiza NAT en un dispositivo afectado. Un atacante remoto no autenticado podría explotar esta vulnerabilidad mediante el envío de paquetes SIP manipulados mediante el puerto UDP 5060 a través de un dispositivo afectado que realiza NAT para los paquetes SIP. Su explotación con éxito podría permitir que un atacante haga que el dispositivo afectado se reinicie, provocando una denegación de servicio (DoS).

*Credits: N/A

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

Medium

Authentication

None

Confidentiality

None

Integrity

None

Availability

Complete

* 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
2024-07-11 EPSS Updated
2024-09-17 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-399: Resource Management Errors

CAPEC

References (4)

URL	Tag	Source
http://www.securityfocus.com/bid/105419	Third Party Advisory
http://www.securitytracker.com/id/1041734	Third Party Advisory
http://www.securitytracker.com/id/1041737	Third Party Advisory

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180926-sip-alg	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 Xe Search vendor "Cisco" for product "Ios Xe"				15.5\(3\)s5.1 Search vendor "Cisco" for product "Ios Xe" and version "15.5\(3\)s5.1"		-		Affected
Cisco Search vendor "Cisco"		Ios Xe Search vendor "Cisco" for product "Ios Xe"				15.5\(3\)s6.1 Search vendor "Cisco" for product "Ios Xe" and version "15.5\(3\)s6.1"		-		Affected
Cisco Search vendor "Cisco"		Ios Xe Search vendor "Cisco" for product "Ios Xe"				16.6.2 Search vendor "Cisco" for product "Ios Xe" and version "16.6.2"		-		Affected