CVE-2019-1884

Cisco Web Security Appliance Web Proxy Denial of Service Vulnerability

Severity Score

6.5

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Track

*SSVC

Descriptions

A vulnerability in the web proxy functionality of Cisco AsyncOS Software for Cisco Web Security Appliance (WSA) could allow an authenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to insufficient input validation mechanisms for certain fields in HTTP/HTTPS requests sent through an affected device. A successful attacker could exploit this vulnerability by sending a malicious HTTP/HTTPS request through an affected device. An exploit could allow the attacker to force the device to stop processing traffic, resulting in a DoS condition.

Una vulnerabilidad en la funcionalidad de proxy web de Cisco AsyncOS Software para Cisco Web Security Appliance (WSA) podría permitir que un atacante remoto autenticado provoque una condición de denegación de servicio (DoS) en un dispositivo afectado. La vulnerabilidad se debe a mecanismos de validación de entrada insuficientes para ciertos campos en las solicitudes HTTP/HTTPS enviadas a través de un dispositivo afectado. Un atacante con éxito podría explotar esta vulnerabilidad enviando una solicitud HTTP/HTTPS malintencionada a través de un dispositivo afectado. Una vulnerabilidad podría permitir que el atacante obligue al dispositivo a detener el procesamiento del tráfico, lo que resulta en una condición DoS.

*Credits: N/A

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

Single

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
2019-07-04 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-asyncos-wsa	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"		Asyncos Search vendor "Cisco" for product "Asyncos"				>= 10.1 < 10.5.5-005 Search vendor "Cisco" for product "Asyncos" and version " >= 10.1 < 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"		Asyncos Search vendor "Cisco" for product "Asyncos"				>= 11.7 < 11.7.0-407 Search vendor "Cisco" for product "Asyncos" and version " >= 11.7 < 11.7.0-407"		-		Affected
Cisco Search vendor "Cisco"		Web Security Appliance Search vendor "Cisco" for product "Web Security Appliance"				10.1.4-017 Search vendor "Cisco" for product "Web Security Appliance" and version "10.1.4-017"		-		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"				11.5.1-fcs-125 Search vendor "Cisco" for product "Web Security Appliance" and version "11.5.1-fcs-125"		-		Affected
Cisco Search vendor "Cisco"		Web Security Appliance Search vendor "Cisco" for product "Web Security Appliance"				11.7.0-256 Search vendor "Cisco" for product "Web Security Appliance" and version "11.7.0-256"		-		Affected