CVE-2022-36085: Protection Mechanism Failure
Open Policy Agent (OPA) is an open source, general-purpose policy engine. The Rego compiler provides a (deprecated) WithUnsafeBuiltins function, which allows users to provide a set of built-in functions that should be deemed unsafe by the compiler if encountered in the policy compilation stage. A bypass of this protection has been found, where the use of the with keyword to mock such a built-in function (a feature introduced in OPA v0.40.0), is not taken into account by WithUnsafeBuiltins. Multiple conditions need to be met in order to create an adverse effect. Version 0.43.1 contains a patch for this issue. As a workaround, avoid using the WithUnsafeBuiltins function and use the capabilities feature instead.
References
- github.com/advisories/GHSA-f524-rf33-2jjr
- github.com/open-policy-agent/opa/commit/25a597bc3f4985162e7f65f9c36599f4f8f55823
- github.com/open-policy-agent/opa/commit/3e8c754ed007b22393cf65e48751ad9f6457fee8
- github.com/open-policy-agent/opa/pull/4540
- github.com/open-policy-agent/opa/pull/4616
- github.com/open-policy-agent/opa/releases/tag/v0.43.1
- github.com/open-policy-agent/opa/security/advisories/GHSA-f524-rf33-2jjr
- nvd.nist.gov/vuln/detail/CVE-2022-36085
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