Telia: Misissued certificate - Invalid wildcard format

Telia Company identified a misissued certificate with an invalid wildcard format during a mass lint scan of its SSL certificates. The scan, conducted on February 8, 2019, revealed nine invalid certificates across various error categories, including one with an invalid wildcard format. Telia promptly revoked the problematic certificate and implemented a fix to their validation logic by February 18, 2019. The incident highlights the importance of regular lint checks and the need for continuous improvement in certificate issuance processes.

1. 2019-02-08 Discovery of invalid certificates during mass lint scan
2. 2019-02-08 Preliminary analysis by Telia Security Board
3. 2019-02-11 Quick analysis confirmed the error could be reproduced
4. 2019-02-18 Fix implemented in production system