| Package | Affected versions | Patched versions |
|---|---|---|
| io.ratpack:ratpack-groovy | < 1.6.1 | 1.6.1 |
| io.ratpack:ratpack-java | < 1.6.1 | 1.6.1 |
| io.ratpack:ratpack-session | < 1.6.1 | 1.6.1 |
| ratpack | < 1.6.1 | 1.6.1 |
Ratpack versions before 1.6.1 generate a session ID using a cryptographically weak PRNG in the JDK's ThreadLocalRandom. This means that if an attacker can determine a small window for the server start time and obtain a session ID value, they can theoretically determine the sequence of session IDs.
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