CVE-2018-15460

Cisco Email Security Appliance URL Filtering Denial of Service Vulnerability

Severity Score

8.6

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Attend

*SSVC

Descriptions

A vulnerability in the email message filtering feature of Cisco AsyncOS Software for Cisco Email Security Appliances (ESA) could allow an unauthenticated, remote attacker to cause the CPU utilization to increase to 100 percent, causing a denial of service (DoS) condition on an affected device. The vulnerability is due to improper filtering of email messages that contain references to whitelisted URLs. An attacker could exploit this vulnerability by sending a malicious email message that contains a large number of whitelisted URLs. A successful exploit could allow the attacker to cause a sustained DoS condition that could force the affected device to stop scanning and forwarding email messages.

Una vulnerabilidad en la funcionalidad de filtrado de mensajes de correo electrónico de Cisco AsyncOS Software para Cisco Email Security Appliances (ESA) podría permitir que un atacante remoto no autenticado aumente el uso de la CPU hasta el 100 por ciento, provocando una condición de denegación de servicio (DoS) en un dispositivo afectado. La vulnerabilidad se debe al filtrado incorrecto de mensajes de email que contienen referencias a URL en lista blanca. Un atacante podría explotar esta vulnerabilidad enviando un mensaje de correo electrónico malicioso que contiene un gran número de URL en lista blanca. Su explotación con éxito podría permitir que el atacante provoque una condición continuada de denegación de servicio (DoS) que podría forzar al dispositivo afectado a que pare de escanear y reenviar mensajes de correo electrónico.

*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

Complete

* Common Vulnerability Scoring System

SSVC

Decision:Attend

Exploitation

None

Automatable

Yes

Tech. Impact

Partial

* Organization's Worst-case Scenario

Timeline

2018-08-17 CVE Reserved
2019-01-10 CVE Published
2024-11-19 CVE Updated
2024-11-19 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-20: Improper Input Validation
CWE-770: Allocation of Resources Without Limits or Throttling

CAPEC

References (2)

URL	Tag	Source
http://www.securityfocus.com/bid/106507	Third Party Advisory

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190109-esa-url-dos	2020-09-16

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Cisco Search vendor "Cisco"	Asyncos Search vendor "Cisco" for product "Asyncos"	< 11.0.2-044_md Search vendor "Cisco" for product "Asyncos" and version " < 11.0.2-044_md"	-	Affected	in	Cisco Search vendor "Cisco"	Email Security Appliance Search vendor "Cisco" for product "Email Security Appliance"	-	-	Safe
Cisco Search vendor "Cisco"	Asyncos Search vendor "Cisco" for product "Asyncos"	>= 11.1.0 < 11.1.2-023_md Search vendor "Cisco" for product "Asyncos" and version " >= 11.1.0 < 11.1.2-023_md"	-	Affected	in	Cisco Search vendor "Cisco"	Email Security Appliance Search vendor "Cisco" for product "Email Security Appliance"	-	-	Safe