CVE-2022-36085

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CVE-2022-36085

Summary: OPA Compiler: Bypass of WithUnsafeBuiltins using `with` keyword to mock functions

Details: 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 — and as such rejected — 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), isn’t 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: https://github.com/open-policy-agent/opa/releases/tag/v0.43.1, https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/36xxx/CVE-2022-36085.json, https://github.com/open-policy-agent/opa/security/advisories/GHSA-f524-rf33-2jjr, https://nvd.nist.gov/vuln/detail/CVE-2022-36085, https://github.com/open-policy-agent/opa/commit/25a597bc3f4985162e7f65f9c36599f4f8f55823, https://github.com/open-policy-agent/opa/commit/3e8c754ed007b22393cf65e48751ad9f6457fee8, https://github.com/open-policy-agent/opa/pull/4540, https://github.com/open-policy-agent/opa/pull/4616