Ecosyste.ms: Advisories

Security Advisories: MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLTJjYzUtMjNyNy12YzR2

Ratpack's default client side session signing key is highly predictable

Impact

The client side session module uses the application startup time as the signing key by default. This means that if an attacker can determine this time, and if encryption is not also used (which is recommended, but is not on by default), the session data could be tampered with by someone with the ability to write cookies.

The default configuration is unsuitable for production use as an application restart renders all sessions invalid and is not multi-host compatible, but its use is not actively prevented.

Vulnerability Location

https://github.com/ratpack/ratpack/blob/29434f7ac6fd4b36a4495429b70f4c8163100332/ratpack-session/src/main/java/ratpack/session/clientside/ClientSideSessionConfig.java#L29

Patches

As of Ratpack 1.9.0 the default value is a securely randomly generated value, generated at application startup time.

Workarounds

Supply an alternative signing key, as per the documentation's recommendation.

Permalink: https://github.com/advisories/GHSA-2cc5-23r7-vc4v
JSON: https://advisories.ecosyste.ms/api/v1/advisories/MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLTJjYzUtMjNyNy12YzR2
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Moderate
Classification: General
Published: over 3 years ago
Updated: almost 2 years ago

CVSS Score: 4.4
CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Identifiers: GHSA-2cc5-23r7-vc4v, CVE-2021-29480
References:

• https://github.com/ratpack/ratpack/security/advisories/GHSA-2cc5-23r7-vc4v
• https://nvd.nist.gov/vuln/detail/CVE-2021-29480
• https://github.com/ratpack/ratpack/blob/29434f7ac6fd4b36a4495429b70f4c8163100332/ratpack-session/src/main/java/ratpack/session/clientside/ClientSideSessionConfig.java#L29
• https://github.com/advisories/GHSA-2cc5-23r7-vc4v

Repository: https://github.com/ratpack/ratpack
Blast Radius: 5.2

Affected Packages