What is GHSA-m42h-mh85-4qgc?

GHSA-m42h-mh85-4qgc is a security advisory published by GitHub Security Advisories with Critical severity. Use of Insufficiently Random Values in Railties Allows Remote Code Execution

Which CVE IDs does GHSA-m42h-mh85-4qgc cover?

GHSA-m42h-mh85-4qgc covers the following CVE IDs: CVE-2019-5420. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-m42h-mh85-4qgc?

GHSA-m42h-mh85-4qgc has a CVSS v3 base score of 9.8, published by GitHub Security Advisories.

Which products are affected by GHSA-m42h-mh85-4qgc?

GHSA-m42h-mh85-4qgc affects 1 product, including: rubygems/railties:\u003e= 5.2.0, \u003c= 5.2.2.0.

GHSA-m42h-mh85-4qgcCriticalCVSS 9.8

Use of Insufficiently Random Values in Railties Allows Remote Code Execution

Vendor

GitHub Security Advisories

Published

March 13, 2019

Last Modified

July 5, 2023

🔗 CVE IDs covered (1)

CVE-2019-5420 →

📋 Description

Possible Remote Code Execution Exploit in Rails Development Mode

Impact

With some knowledge of a target application it is possible for an attacker to guess the automatically generated development mode secret token. This secret token can be used in combination with other Rails internals to escalate to a remote code execution exploit.

All users running an affected release should either upgrade or use one of the workarounds immediately.

Releases

The 6.0.0.beta3 and 5.2.2.1 releases are available at the normal locations.

Workarounds

This issue can be mitigated by specifying a secret key in development mode. In "config/environments/development.rb" add this:

  config.secret_key_base = SecureRandom.hex(64)

Please note that only the 5.2.x, 5.1.x, 5.0.x, and 4.2.x series are supported at present. Users of earlier unsupported releases are advised to upgrade as soon as possible as we cannot guarantee the continued availability of security fixes for unsupported releases.