Specially crafted requests can be used to access files that exist on the filesystem that is outside an applicationβs root directory, when the Sprockets server is used in production.
All users running an affected release should either upgrade or use one of the work arounds immediately.
In Rails applications, work around this issue, set config.assets.compile = false
and config.public_file_server.enabled = true
in an initializer and precompile the assets.
This work around will not be possible in all hosting environments and upgrading is advised.
access.redhat.com/errata/RHSA-2018:2244
access.redhat.com/errata/RHSA-2018:2245
access.redhat.com/errata/RHSA-2018:2561
access.redhat.com/errata/RHSA-2018:2745
github.com/rails/sprockets
github.com/rails/sprockets/commit/18b8a7f07a50c245e9aee7854ecdbe606bbd8bb5
github.com/rails/sprockets/commit/9c34fa05900b968d74f08ccf40917848a7be9441
github.com/rails/sprockets/commit/c09131cf5b2c479263939c8582e22b98ed616c5f
groups.google.com/d/msg/rubyonrails-security/ft_J--l55fM/7roDfQ50BwAJ
nvd.nist.gov/vuln/detail/CVE-2018-3760
www.debian.org/security/2018/dsa-4242