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CVE-2020-8165 is an unsafe deserialization vulnerability in ActiveSupport's MemCacheStore and RedisCacheStore. In affected Rails releases, attacker-controlled data written to a cache with the raw option enabled can subsequently be interpreted and unmarshalled as a Ruby object when it is read using incompatible cache serialization settings. This permits injection of untrusted Ruby objects into the application process and can result in remote code execution depending on available deserialization gadget chains.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This repository is a proof-of-concept exploit for CVE-2020-8165, a remote code execution vulnerability in Ruby on Rails (version 5.2.3) when using Redis as the cache store. The exploit leverages unsafe deserialization via a crafted payload sent to the /users endpoint, which is handled by the UsersController#index action. The payload is a marshaled Ruby object that, when deserialized by the vulnerable cache fetch operation, results in arbitrary command execution on the server (demonstrated by creating /tmp/rce). The repository is structured as a minimal Rails API application, with the main exploit logic described in the README and implemented in the controller. The exploit requires the target to be running the vulnerable Rails version, have Redis configured as the cache store, and expose the /users endpoint. No detection or fake code is present; this is a working exploit POC.
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