A reliance on cookies without validation/integrity check security vulnerability exists in rack < 2.2.3, rack < 2.1.4 that makes it is possible for an attacker to forge a secure or host-only cookie prefix.
{ "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro", "ubuntu_priority": "medium", "binaries": [ { "binary_version": "1.5.2-3+deb8u3ubuntu1~esm4", "binary_name": "librack-ruby" }, { "binary_version": "1.5.2-3+deb8u3ubuntu1~esm4", "binary_name": "librack-ruby1.8" }, { "binary_version": "1.5.2-3+deb8u3ubuntu1~esm4", "binary_name": "librack-ruby1.9.1" }, { "binary_version": "1.5.2-3+deb8u3ubuntu1~esm4", "binary_name": "ruby-rack" } ] }