CVE-2019-1886

Cisco Web Security Appliance HTTPS Certificate 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 HTTPS decryption feature of Cisco Web Security Appliance (WSA) could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. The vulnerability is due to insufficient validation of Secure Sockets Layer (SSL) server certificates. An attacker could exploit this vulnerability by installing a malformed certificate in a web server and sending a request to it through the Cisco WSA. A successful exploit could allow the attacker to cause an unexpected restart of the proxy process on an affected device.

Una vulnerabilidad en la función de descifrado HTTPS de Cisco Web Security Appliance (WSA) podría permitir que un atacante remoto no autenticado provoque una condición de denegación de servicio (DoS). La vulnerabilidad se debe a la validación insuficiente de los certificados de servidor Secure Sockets Layer (SSL). Un atacante podría aprovechar esta vulnerabilidad instalando un certificado con formato incorrecto en un servidor web y enviándole una solicitud a través de Cisco WSA. Una explotación con éxito podría permitir al atacante provocar un reinicio inesperado del proceso de proxy en un dispositivo afectado.

*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:Attend

Exploitation

None

Automatable

Yes

Tech. Impact

Partial

* Organization's Worst-case Scenario

Timeline

2018-12-06 CVE Reserved
2019-07-04 CVE Published
2023-03-07 EPSS Updated
2024-11-19 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-20: Improper Input Validation
CWE-295: Improper Certificate Validation

CAPEC

References (2)

URL	Tag	Source
http://www.securityfocus.com/bid/109049	Third Party Advisory

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190703-wsa-dos	2020-10-16

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"				>= 10.5 < 10.5.5-005 Search vendor "Cisco" for product "Asyncos" and version " >= 10.5 < 10.5.5-005"		-		Affected
Cisco Search vendor "Cisco"		Asyncos Search vendor "Cisco" for product "Asyncos"				>= 11.5 < 11.5.2-020 Search vendor "Cisco" for product "Asyncos" and version " >= 11.5 < 11.5.2-020"		-		Affected
Cisco Search vendor "Cisco"		Web Security Appliance Search vendor "Cisco" for product "Web Security Appliance"				10.5.2-072 Search vendor "Cisco" for product "Web Security Appliance" and version "10.5.2-072"		-		Affected
Cisco Search vendor "Cisco"		Web Security Appliance Search vendor "Cisco" for product "Web Security Appliance"				10.5.3-025 Search vendor "Cisco" for product "Web Security Appliance" and version "10.5.3-025"		-		Affected
Cisco Search vendor "Cisco"		Web Security Appliance Search vendor "Cisco" for product "Web Security Appliance"				11.7.0-fcs-334 Search vendor "Cisco" for product "Web Security Appliance" and version "11.7.0-fcs-334"		-		Affected