CVE-2022-36085
OPA Compiler: Bypass of WithUnsafeBuiltins using `with` keyword to mock functions
- State
- Published
- Severity
- 7.4 High
- Published
- Sep 8, 2022
- Updated
- Apr 22, 2025
- Reserved
- Jul 15, 2022
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 7.4 High | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N | GitHub_M |
Weaknesses
Affected Products
| Product | Versions |
|---|---|
opaopen-policy-agent |
|
References
- https://github.com/open-policy-agent/opa/security/advisories/GHSA-f524-rf33-2jjr
- https://github.com/open-policy-agent/opa/pull/4540
- https://github.com/open-policy-agent/opa/pull/4616
- 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/releases/tag/v0.43.1
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