RubyGems versions between 2.0.0 and 2.6.13 are vulnerable to a possible remote code execution vulnerability. YAML deserialization of gem specifications can bypass class white lists. Specially crafted serialized objects can possibly be used to escalate to remote code execution.
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{ "availability": "No subscription required", "ubuntu_priority": "medium", "binaries": [ { "binary_name": "libruby2.3", "binary_version": "2.3.1-2~16.04.6" }, { "binary_name": "libruby2.3-dbg", "binary_version": "2.3.1-2~16.04.6" }, { "binary_name": "libruby2.3-dbgsym", "binary_version": "2.3.1-2~16.04.6" }, { "binary_name": "ruby2.3", "binary_version": "2.3.1-2~16.04.6" }, { "binary_name": "ruby2.3-dbgsym", "binary_version": "2.3.1-2~16.04.6" }, { "binary_name": "ruby2.3-dev", "binary_version": "2.3.1-2~16.04.6" }, { "binary_name": "ruby2.3-dev-dbgsym", "binary_version": "2.3.1-2~16.04.6" }, { "binary_name": "ruby2.3-doc", "binary_version": "2.3.1-2~16.04.6" }, { "binary_name": "ruby2.3-tcltk", "binary_version": "2.3.1-2~16.04.6" }, { "binary_name": "ruby2.3-tcltk-dbgsym", "binary_version": "2.3.1-2~16.04.6" } ] }