CVE-2022-36085
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.56%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 1.56% probability · 74th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-20, CWE-693
- Affected
- openpolicyagent/open policy agent
- Source
- security-advisories@github.com
References
- https://github.com/open-policy-agent/opa/commit/25a597bc3f4985162e7f65f9c36599f4f8f55823Patch, Third Party Advisory
- https://github.com/open-policy-agent/opa/commit/3e8c754ed007b22393cf65e48751ad9f6457fee8Patch, Third Party Advisory
- https://github.com/open-policy-agent/opa/pull/4540Exploit, Patch, Third Party Advisory
- https://github.com/open-policy-agent/opa/pull/4616Exploit, Patch, Third Party Advisory
- https://github.com/open-policy-agent/opa/releases/tag/v0.43.1Third Party Advisory
- https://github.com/open-policy-agent/opa/security/advisories/GHSA-f524-rf33-2jjrExploit, Patch, Third Party Advisory
- https://github.com/open-policy-agent/opa/commit/25a597bc3f4985162e7f65f9c36599f4f8f55823Patch, Third Party Advisory
- https://github.com/open-policy-agent/opa/commit/3e8c754ed007b22393cf65e48751ad9f6457fee8Patch, Third Party Advisory
- https://github.com/open-policy-agent/opa/pull/4540Exploit, Patch, Third Party Advisory
- https://github.com/open-policy-agent/opa/pull/4616Exploit, Patch, Third Party Advisory
- https://github.com/open-policy-agent/opa/releases/tag/v0.43.1Third Party Advisory
- https://github.com/open-policy-agent/opa/security/advisories/GHSA-f524-rf33-2jjrExploit, Patch, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.