The presentation discusses the vulnerability of TLS compression and how attackers can conduct compression oracle attacks to steal sensitive information such as session IDs. The speaker provides a demo of the attack and emphasizes the importance of avoiding compressing and encrypting data together.
- TLS compression is vulnerable to compression oracle attacks
- Attackers can inject malicious code to steal sensitive information such as session IDs
- Browsers have ambient authority which allows cookies to be sent regardless of where the request is sent from
- High Steepy responses can also be attacked
- The speaker provides a demo of the attack using Open VPN and a web app
- Compression and encryption should not be used together
The speaker demonstrates the attack by using a VPN user accessing a corporate website over HTTP. The attacker injects malicious code and sends cross-domain requests to conduct compression oracle attacks on the user's requests and responses. The attacker is able to steal the session ID from the user's cookies. The speaker emphasizes the importance of avoiding compressing and encrypting data together to prevent such attacks.