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Vulnerability · Published Sep 8, 2022 · Assigned by GitHub_M

CVE-2022-36085OPA Compiler: Bypass of WithUnsafeBuiltins using `with` keyword to mock functions

High 7.4

In plain English

A high-severity improper input validation in opa from open-policy-agent. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 1.6% (higher than 76% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.4High
Exploit odds (30 days)1.6%top 23.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Gogithub.com/open-policy-agent/opa0.43.1GHSA-f524-rf33-2jjr
Gogithub.com/open-policy-agent/opa0.44.0GO-2022-0978

Affected products (as reported)

VendorProductVersions
open-policy-agent opa >= 0.40.0, < 0.43.1

Weakness: CWE-693, CWE-20 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

References