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

Low severity GitHub Reviewed Published May 14, 2019 to the GitHub Advisory Database • Updated Feb 1, 2023

Package

maven io.ratpack:ratpack-groovy (Maven)

Affected versions

< 1.6.1

Patched versions

1.6.1
maven io.ratpack:ratpack-java (Maven)
< 1.6.1
1.6.1
maven io.ratpack:ratpack-session (Maven)
< 1.6.1
1.6.1

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.

References

Published by the National Vulnerability Database May 7, 2019
Reviewed May 14, 2019
Published to the GitHub Advisory Database May 14, 2019
Last updated Feb 1, 2023

Severity

Low

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
High
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS score

0.176%
(56th percentile)

Weaknesses

CVE ID

CVE-2019-11808

GHSA ID

GHSA-54mg-vgrp-mwx9

Source code

No known source code
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