cisco-sa-20190703-wsa-dos: Cisco Web Security Appliance HTTPS Certificate Denial of Service Vulnerability
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. 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-20190703-wsa-dos
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Affected Software
Event History
Frequently Asked Questions
What vulnerability does cisco-sa-20190703-wsa-dos address?
The cisco-sa-20190703-wsa-dos addresses a denial of service (DoS) vulnerability in the HTTPS decryption feature of Cisco Web Security Appliance.
What is the severity of cisco-sa-20190703-wsa-dos?
The severity of cisco-sa-20190703-wsa-dos is classified as high due to its potential impact on service availability.
How do I fix cisco-sa-20190703-wsa-dos?
To fix cisco-sa-20190703-wsa-dos, upgrade your Cisco AsyncOS Software to the recommended version 10.5.5-005 or a later release.
Who is affected by cisco-sa-20190703-wsa-dos?
The cisco-sa-20190703-wsa-dos vulnerability affects users of Cisco Web Security Appliance running vulnerable versions of AsyncOS Software.
Can cisco-sa-20190703-wsa-dos be exploited remotely?
Yes, cisco-sa-20190703-wsa-dos can be exploited by unauthenticated remote attackers.