Description
The DNS server for Cisco Content Service Switch (CSS) 11000 and 11500, when prompted for a nonexistent AAAA record, responds with response code 3 (NXDOMAIN or "Name Error") instead of response code 0 ("No Error"), which allows remote attackers to cause a denial of service (inaccessible domain) by forcing other DNS servers to send and cache a request for a AAAA record to the vulnerable server.
References
- 20041008 Cisco Content Service Switch 11000 Series DNS Negative Cache of Information Denial-of-Service Vulnerability vendor-advisory
- VU#714121 third-party-advisory