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Cisco Web Security Appliance DNS Resolution Vulnerability
Information
Severity
Severity
Family
Family
CVSSv2 Base
CVSSv2 Base
CVSSv2 Vector
CVSSv2 Vector
Solution Type
Solution Type
Created
Created
Modified
Modified
Summary
Cisco Web Security Appliance contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service condition.
Insight
Insight
The vulnerability is due to the handling of DNS requests awaiting a DNS response when new, incoming DNS requests are received. An attacker could exploit this vulnerability by sending TCP proxy traffic to the WSA at a high rate. An exploit could allow the attacker to cause a partial DoS condition because DNS name resolution fails, which results in the client receiving a HTTP 503 'Service Unavailable' error.
Affected Software
Affected Software
Cisco WSA versions 8.0.6-078 and 8.0.6-115 are vulnerable.
Detection Method
Detection Method
Checks if a vulnerable version is present on the target host.
Solution
Solution
Updates are available. Please see the vendor advisory for more information.