github.com/open-policy-agent/opa: CVE-2022-36085

[github-actions]

Title

open-policy-agent: Compiler Bypass of WithUnsafeBuiltins using "with" keyword to mock functions

Description

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.

Severity

CRITICAL

Primary URL

https://avd.aquasec.com/nvd/cve-2022-36085

References

• https://access.redhat.com/security/cve/CVE-2022-36085
• open-policy-agent/opa@25a597b
• open-policy-agent/opa@3e8c754
• compiler: allow for mocking built-in functions via "with" open-policy-agent/opa#4540
• ast+topdown+planner: non-built-in function mocking open-policy-agent/opa#4616
• https://github.com/open-policy-agent/opa/releases/tag/v0.43.1
• GHSA-f524-rf33-2jjr
• https://pkg.go.dev/vuln/GO-2022-0978

[knqyf263]

Fixed in 047a0b3