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Maven

GHSA-54mg-vgrp-mwx9

LOW

Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG) in Ratpack

Also known asCVE-2019-11808
Published
May 14, 2019
Updated
Nov 8, 2023
Affected
3 pkgs
Patched
3 / 3
Exploits
None indexed

Blast Radius

3 pkgs affected
io.ratpack:ratpack-sessionio.ratpack:ratpack-javaio.ratpack:ratpack-groovy

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.

Description

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.

Affected Packages

3 total 3 fixed
EcosystemPackageVulnerable rangeFix
Mavenio.ratpack:ratpack-sessionall versions1.6.1
Mavenio.ratpack:ratpack-javaall versions1.6.1
Mavenio.ratpack:ratpack-groovyall versions1.6.1

Detection & mitigation playbook

Open-source dependency
  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for io.ratpack:ratpack-session. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.

  2. Fix

    Update io.ratpack:ratpack-session to 1.6.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-54mg-vgrp-mwx9 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

  4. How O3 protects you

    O3 pinpoints whether GHSA-54mg-vgrp-mwx9 is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.

Tailored to GHSA-54mg-vgrp-mwx9. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

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.
O3 Security · Impact-Aware SCA

Is GHSA-54mg-vgrp-mwx9 in your dependencies?

O3 detects GHSA-54mg-vgrp-mwx9 across Maven dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.