A sequence injection vulnerability exists in Rack <2.0.9.1, <2.1.4.1 and <2.2.3.1 which could allow is a possible shell escape in the Lint and CommonLogger components of Rack.
{ "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro", "ubuntu_priority": "medium", "binaries": [ { "ruby-rack": "1.5.2-3+deb8u3ubuntu1~esm4", "librack-ruby": "1.5.2-3+deb8u3ubuntu1~esm4", "librack-ruby1.8": "1.5.2-3+deb8u3ubuntu1~esm4", "librack-ruby1.9.1": "1.5.2-3+deb8u3ubuntu1~esm4" } ] }