The actual command to execute is in the git_set ruby r.rb These don’t matter, they simply need to be valid Yaml. For these to actually be loaded/deserialized, they need to have data, thus the i: x and i: y. To accomplish this, they are added as ruby objects at the start of the yaml payload.
The one interesting part is that the payload needs to include both Gem::Installer and Gem::SpecFetcher to ensure all the required classes are loaded by the autoloader. The new payload is pretty straight forward and easy to understand. In this instance I’m not going to go through the whole process of getting to this, since it was almost identical to the process covered in my previous post. Īs with the previous gadget I wanted to make this exploitable via YAML.load. His write-up for this is excellent and I highly recommend you give it a read. Fortunately, William Bowling (vakzz) has found a new gadget chain that works on all Ruby versions 2.x - 3.x. This has since been patched and no longer works on Ruby versions after 2.7.2 and Rails 6.1. App Runner only makes lower-level updates to the runtime of your service.A couple of years ago I wrote a universal YAML.load deserialization RCE gadget based on the work by Luke Jahnke from elttam. YouĬan lock to any level of version, including a major or minor version.
If your application requires a specific version ofĪ managed runtime, you can specify it using the runtime-version keyword in the App Runner configuration file. įor valid Ruby runtime names and versions, see Ruby runtime release information.Īpp Runner updates the runtime for your service to the latest version on every deployment or service update. The naming convention of a managed runtime is.
Yaml ruby runner code#
Runtime keyword in a App Runner configuration file that you include in your code repository. You can also specify a runtime as part of your source code. You specify a runtime for your App Runner service when you create a service using the App Runner console or the CreateService API operation. It then deploys this image to run your web service in a Managed runtime image as a base image, and adds your application code to build a Docker image. This image is based on the Amazon Linux Docker image and contains the runtime package for a version of Ruby and some tools. When you use a Ruby runtime, App Runner starts with a managed Ruby runtime image. Each runtime makes it easy to build and run containers with web applications based on a Ruby
The AWS App Runner Ruby platform provides managed runtimes.
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