CVE-2020-15172

The Act module for Red Discord Bot before commit 6b9f3b86 is vulnerable to Remote Code Execution. With this exploit, Discord users can use specially crafted messages to perform destructive actions and/or access sensitive information. Unloading the Act module with unload act can render this exploit inaccessible.

Weakness

The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.

Affected Software

Potential Mitigations

• Make fields transient to protect them from deserialization.
• An attempt to serialize and then deserialize a class containing transient fields will result in NULLs where the transient data should be. This is an excellent way to prevent time, environment-based, or sensitive variables from being carried over and used improperly.

Related Attack Patterns

• https://cwe.mitre.org/data/definitions/586.html

References

• https://github.com/zephyrkul/FluffyCogs/commit/6b9f3b862e1f0a5429c62f3090f814e53a242347
• https://github.com/zephyrkul/FluffyCogs/security/advisories/GHSA-rm7m-j4xp-rv2p
• https://github.com/zephyrkul/FluffyCogs/commit/6b9f3b862e1f0a5429c62f3090f814e53a242347
• https://github.com/zephyrkul/FluffyCogs/security/advisories/GHSA-rm7m-j4xp-rv2p