CVE-2019-1884

04.07.2019, 20:15

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.

Provider	Type	Base Score	Atk. Vector	Atk. Complexity	Priv. Required	Vector
NIST	NIST	7.7 HIGH	NETWORK	LOW	LOW	CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
cisco	CNA	7.7 HIGH	NETWORK	LOW	LOW	CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
CVE	ADP	---				---
CISA-ADP	ADP	---				---

Base Score

CVSS 3.x

EPSS Score

Percentile: 58%

Vendor	Product	Version
cisco	asyncos	10.1 ≤ 𝑥 < 10.5.5-005
cisco	asyncos	11.5 ≤ 𝑥 < 11.5.2-020
cisco	asyncos	11.7 ≤ 𝑥 < 11.7.0-407
cisco	web_security_appliance	10.1.4-017
cisco	web_security_appliance	10.5.2-072
cisco	web_security_appliance	11.5.1-fcs-125
cisco	web_security_appliance	11.7.0-256

𝑥

= Vulnerable software versions

Common Weakness Enumeration

CWE-20 - Improper Input Validation
The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

References

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190703-asyncos-wsa