Gentoo Linux Security Advisory 201405-10 - Multiple vulnerabilities have been found in Rack, the worst of which allow execution of arbitrary code. Versions less than 1.4.5 are affected.
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Red Hat Security Advisory 2013-0638-01 - OpenShift Enterprise is a cloud computing Platform-as-a-Service solution from Red Hat, and is designed for on-premise or private cloud deployments. A flaw was found in the handling of paths provided to ruby193-rubygem-rack. A remote attacker could use this flaw to conduct a directory traversal attack by passing malformed requests. A timing attack flaw was found in the way rubygem-rack and ruby193-rubygem-rack processed HMAC digests in cookies. This flaw could aid an attacker using forged digital signatures to bypass authentication checks.
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