Improper input validation in Open-Policy-Agent Opa
CVE-2022-36085
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.
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.016 (74.8th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 75th percentile — 74.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.013 · newest: 0.016 · change: +0.003
Affected products
- Open-Policy-Agent Opa — versions >= 0.40.0, < 0.43.1
- Openpolicyagent Open Policy Agent
Weakness classification (CWE)
References
- github.com/open-policy-agent/opa/security/advisories/GHSA-f524-rf33-2jjr (Exploit, Patch, Third Party Advisory)
- github.com/open-policy-agent/opa/pull/4540 (Exploit, Patch, Third Party Advisory)
- github.com/open-policy-agent/opa/pull/4616 (Exploit, Patch, Third Party Advisory)
- github.com/open-policy-agent/opa/commit/25a597bc3f4985162e7f65f9c36599f4f8f55823 (Patch, Third Party Advisory)
- github.com/open-policy-agent/opa/commit/3e8c754ed007b22393cf65e48751ad9f6457fee8 (Patch, Third Party Advisory)
- github.com/open-policy-agent/opa/releases/tag/v0.43.1 (Third Party Advisory)
Frequently asked questions
- What is CVE-2022-36085?
- CVE-2022-36085 is a high-severity vulnerability in Open-Policy-Agent Opa, classified under Improper Input Validation. CVSS score: 7.4/10. Published 2022-09-08.
- How severe is CVE-2022-36085?
- High severity. CVSS v3 base score is 7.4 out of 10.