cisco-sa-20190206-wsa-bypass: Cisco Web Security Appliance Decryption Policy Bypass Vulnerability
A vulnerability in the Decryption Policy Default Action functionality of the Cisco Web Security Appliance (WSA) could allow an unauthenticated, remote attacker to bypass a configured drop policy and allow traffic onto the network that should have been denied. The vulnerability is due to the incorrect handling of SSL-encrypted traffic when Decrypt for End-User Notification is disabled in the configuration. An attacker could exploit this vulnerability by sending a SSL connection through the affected device. A successful exploit could allow the attacker to bypass a configured drop policy to block specific SSL connections.
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-20190206-wsa-bypass
Credit
Affected Software
Event History
Frequently Asked Questions
What is the severity of cisco-sa-20190206-wsa-bypass?
The severity of cisco-sa-20190206-wsa-bypass is classified as high due to the potential for unauthorized access to network traffic.
How can I fix cisco-sa-20190206-wsa-bypass?
To fix cisco-sa-20190206-wsa-bypass, you should upgrade the Cisco Web Security Appliance to a version that includes the patched Decryption Policy.
Who is affected by cisco-sa-20190206-wsa-bypass?
Organizations using vulnerable versions of Cisco Web Security Appliance are affected by cisco-sa-20190206-wsa-bypass.
What type of attacks can exploit cisco-sa-20190206-wsa-bypass?
cisco-sa-20190206-wsa-bypass can be exploited by unauthenticated remote attackers who want to bypass security policies.
Is there a workaround for cisco-sa-20190206-wsa-bypass?
Currently, applying the recommended updates is the primary mitigation for cisco-sa-20190206-wsa-bypass as no specific workaround is provided.