cisco-sa-20190501-wsa-dos: Cisco Web Security Appliance Malformed Request Denial of Service Vulnerability
A vulnerability in the web proxy functionality of Cisco AsyncOS Software for Cisco Web Security Appliance could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to improper validation of HTTP and HTTPS requests. An attacker could exploit this vulnerability by sending a malformed HTTP or HTTPS request to an affected device. An exploit could allow the attacker to cause a restart of the web proxy process, resulting in a temporary DoS condition.
Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.
This advisory is available at the following link: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190501-wsa-dos
Credit
Affected Software
Event History
Frequently Asked Questions
What is the severity of cisco-sa-20190501-wsa-dos?
The severity of cisco-sa-20190501-wsa-dos is classified as high due to its potential to cause a denial of service condition.
How do I fix cisco-sa-20190501-wsa-dos?
To fix cisco-sa-20190501-wsa-dos, you should upgrade to the latest version of Cisco AsyncOS Software that addresses this vulnerability.
What devices are affected by cisco-sa-20190501-wsa-dos?
Cisco AsyncOS Software versions 11.5.2-020 and 11.7.0-406 for Cisco Web Security Appliance are affected by cisco-sa-20190501-wsa-dos.
Can cisco-sa-20190501-wsa-dos be exploited remotely?
Yes, cisco-sa-20190501-wsa-dos can be exploited by unauthenticated remote attackers.
What does cisco-sa-20190501-wsa-dos vulnerability affect?
The cisco-sa-20190501-wsa-dos vulnerability affects the web proxy functionality of Cisco AsyncOS Software.