CVE-2022-23628

Vulnerability Description

OPA is an open source, general-purpose policy engine. Under certain conditions, pretty-printing an abstract syntax tree (AST) that contains synthetic nodes could change the logic of some statements by reordering array literals. Example of policies impacted are those that parse and compare web paths. **All of these** three conditions have to be met to create an adverse effect: 1. An AST of Rego had to be **created programmatically** such that it ends up containing terms without a location (such as wildcard variables). 2. The AST had to be **pretty-printed** using the `github.com/open-policy-agent/opa/format` package. 3. The result of the pretty-printing had to be **parsed and evaluated again** via an OPA instance using the bundles, or the Golang packages. If any of these three conditions are not met, you are not affected. Notably, all three would be true if using **optimized bundles**, i.e. bundles created with `opa build -O=1` or higher. In that case, the optimizer would fulfil condition (1.), the result of that would be pretty-printed when writing the bundle to disk, fulfilling (2.). When the bundle was then used, we'd satisfy (3.). As a workaround users may disable optimization when creating bundles.

CVSS Score

Affected Products

Related Weaknesses (CWE)

References

• https://github.com/open-policy-agent/opa/commit/932e4ffc37a590ace79e9b75ca434028PatchThird Party Advisory
• https://github.com/open-policy-agent/opa/commit/bfd984ddf93ef2c4963a08d4fdadae0bPatchThird Party Advisory
• https://github.com/open-policy-agent/opa/pull/3851Issue TrackingPatchThird Party Advisory
• https://github.com/open-policy-agent/opa/security/advisories/GHSA-hcw3-j74m-qc58ExploitPatchThird Party Advisory
• https://github.com/open-policy-agent/opa/commit/932e4ffc37a590ace79e9b75ca434028PatchThird Party Advisory
• https://github.com/open-policy-agent/opa/commit/bfd984ddf93ef2c4963a08d4fdadae0bPatchThird Party Advisory
• https://github.com/open-policy-agent/opa/pull/3851Issue TrackingPatchThird Party Advisory
• https://github.com/open-policy-agent/opa/security/advisories/GHSA-hcw3-j74m-qc58ExploitPatchThird Party Advisory