Cisco Bug: CSCvu35319 - ASA allowing invalid domain name entry while configuring split DNS
May 31, 2020
- Cisco ASA 5500-X Series Firewalls
Known Affected Releases
Symptom: Invalid domain names such as '.example' are not supported in the split-dns configuration under group-policy on an ASA and can yield unexpected results. ASA allows configuring a domain name in split dns entry which can cause inconsistent behaviour. Example: split-dns value inside.abc.com cad.prod ric123.xyz.com cad.stage intranet123.abc.com .prod split-tunnel-all-dns disable So in the above example, '.prod' is not a supported configuration construct. The feature may not work as required. Conditions: Running ASA version 9.8.2, or others affected by CSCvu35319. Tested with Any Connect version 4.6 and configuring an un-supported domain name like, ".abc" in split-dns configuration.
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