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Ubuntu Security Notice USN-7646-1
July 17, 2025

rails vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Rails could be made to expose sensitive information over the
network.

Software Description:
- rails: MVC ruby based framework geared for web application development

Details:

It was discovered that Rails did not correctly handle headers. An
attacker could potentially use this issue to view arbitrary files
on a target server. (CVE-2019-5418)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 18.04 LTS
  rails                           2:4.2.10-0ubuntu4+esm2
                                  Available with Ubuntu Pro
  ruby-actionpack                 2:4.2.10-0ubuntu4+esm2
                                  Available with Ubuntu Pro
  ruby-actionview                 2:4.2.10-0ubuntu4+esm2
                                  Available with Ubuntu Pro

Ubuntu 16.04 LTS
  rails                           2:4.2.6-1ubuntu0.1~esm2
                                  Available with Ubuntu Pro
  ruby-actionpack                 2:4.2.6-1ubuntu0.1~esm2
                                  Available with Ubuntu Pro
  ruby-actionview                 2:4.2.6-1ubuntu0.1~esm2
                                  Available with Ubuntu Pro

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-7646-1 
<https://ubuntu.com/security/notices/USN-7646-1>
  CVE-2019-5418