CVE-2022-28946: Github.com/open policy agent/opa Out Of Bounds Memory Access Vulnerability

HIGH
Advisory Identifier: GHSA-x7f3-62pm-9p38
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CVSS 7.5
CWE-119
Published
Advisory Summary

CVE-2022-28946 is a HIGH (CVSS 7.5) out of bounds memory access vulnerability (CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer) affecting Github.com/open policy agent/opa libraries in the Go ecosystem. The issue involves out of bounds memory access in github.com/open-policy-agent/opa. Remediation is available by upgrading affected packages to version 0.40.0.

CVE-2022-28946 at a Glance

CVE Identifier CVE-2022-28946
GHSA Identifier GHSA-x7f3-62pm-9p38
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer
Affected Product Github.com/open policy agent/opa
Package Ecosystem Go
Published Date
Last Updated

Security Impact

CVSS: 7.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity None (I:N)
Availability High (A:H)

How to Fix CVE-2022-28946

To remediate this vulnerability, upgrade all affected Github.com/open policy agent/opa dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

github.com/open-policy-agent/opa fixed: 0.40.0 
Upgrade github.com/open-policy-agent/opa to 0.40.0
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for github.com/open-policy-agent/opa

How to Check if You Are Affected

To determine whether your application is affected by CVE-2022-28946, inspect your project dependencies for Github.com/open policy agent/opa:

inspect dependencies for github.com/open-policy-agent/opa

Analyze the terminal output to locate any version of Github.com/open policy agent/opa in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.40.0), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer, where the product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. this may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data. In Github.com/open policy agent/opa, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

An issue in the component ast/parser.go of Open Policy Agent v0.39.0 causes the application to incorrectly interpret every expression, causing a Denial of Service (DoS) via triggering out-of-range memory access.

CVE-2022-28946 Affected Github.com/open policy agent/opa Versions

1 component(s)
Fixed Versions:
0.40.0
Product / Package Ecosystem Affected Versions Fixed Version
github.com/open-policy-agent/opa
golang/github.com/open-policy-agent/opa
Go
< 0.40.0
0.40.0

References

NVD — CVE-2022-28946 NVD
https://nvd.nist.gov/vuln/detail/CVE-2022-28946
Github.com/open policy agent/opa Source Repository REPOSITORY
https://github.com/open-policy-agent/opa/pull/4548
Security Fix Commit FIX COMMIT
https://github.com/open-policy-agent/opa/commit/e9d3828db670cbe11129885f37f08cbf04935264
Github.com/open policy agent/opa Source Repository REPOSITORY
https://github.com/open-policy-agent/opa
pkg.go.dev/vuln/go-2022-0587 WEB
https://pkg.go.dev/vuln/GO-2022-0587

Frequently Asked Questions

What is CVE-2022-28946?
CVE-2022-28946 is a security vulnerability in Github.com/open policy agent/opa involving Out of bounds memory access in github.com/open-policy-agent/opa under CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer.
Which Github.com/open policy agent/opa versions are affected?
Affected versions include releases prior to 0.40.0 across affected packages: github.com/open-policy-agent/opa.
What version fixes CVE-2022-28946?
Upgrading to 0.40.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/open-policy-agent/opa affected?
Yes, github.com/open-policy-agent/opa is affected in releases prior to 0.40.0. Upgrade your dependency to 0.40.0 or later.
What is the CVSS score of CVE-2022-28946?
CVE-2022-28946 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2022-28946?
CVE-2022-28946 is classified under CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer (The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.).
How can I check Go dependencies for CVE-2022-28946?
Run the dependency tree command: 'inspect dependencies for github.com/open-policy-agent/opa'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-x7f3-62pm-9p38",
  "modified" : "2022-05-31T23:27:52Z",
  "published" : "2022-05-20T00:00:26Z",
  "aliases" : [ "CVE-2022-28946" ],
  "summary" : "Out of bounds memory access in github.com/open-policy-agent/opa",
  "details" : "An issue in the component ast/parser.go of Open Policy Agent v0.39.0 causes the application to incorrectly interpret every expression, causing a Denial of Service (DoS) via triggering out-of-range memory access.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/open-policy-agent/opa"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.40.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2022-28946"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/open-policy-agent/opa/pull/4548"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/open-policy-agent/opa/commit/e9d3828db670cbe11129885f37f08cbf04935264"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/open-policy-agent/opa"
  }, {
    "type" : "WEB",
    "url" : "https://pkg.go.dev/vuln/GO-2022-0587"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-119" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-05-25T20:20:13Z",
    "nvd_published_at" : "2022-05-19T19:15:00Z"
  }
}