CVE-2017-20146: Github.com/gorilla/handlers Gorilla/handlers May Allow Requester To Vulnerability

CRITICAL
Advisory Identifier: GHSA-jcr6-mmjj-pchw
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CVSS 9.8
CWE-346
Published
Advisory Summary

CVE-2017-20146 is a CRITICAL (CVSS 9.8) gorilla/handlers may allow requester to vulnerability (CWE-346: Origin Validation Error) affecting Github.com/gorilla/handlers libraries in the Go ecosystem. The issue involves gorilla/handlers may allow requester to bypass expected behavior of the same origin policy. Remediation is available by upgrading affected packages to version 1.3.0.

CVE-2017-20146 at a Glance

CVE Identifier CVE-2017-20146
GHSA Identifier GHSA-jcr6-mmjj-pchw
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification CWE-346: Origin Validation Error
Affected Product Github.com/gorilla/handlers
Package Ecosystem Go
Published Date
Last Updated

Security Impact

CVSS: 9.8

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:H/I:H/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 High (C:H)
Integrity High (I:H)
Availability High (A:H)

How to Fix CVE-2017-20146

To remediate this vulnerability, upgrade all affected Github.com/gorilla/handlers 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/gorilla/handlers fixed: 1.3.0 
Upgrade github.com/gorilla/handlers to 1.3.0
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/gorilla/handlers

How to Check if You Are Affected

To determine whether your application is affected by CVE-2017-20146, inspect your project dependencies for Github.com/gorilla/handlers:

inspect dependencies for github.com/gorilla/handlers

Analyze the terminal output to locate any version of Github.com/gorilla/handlers in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.3.0), 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-346: Origin Validation Error, where the product does not properly verify that the source of data or communication is valid. In Github.com/gorilla/handlers, 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

Usage of the CORS handler may apply improper CORS headers, allowing the requester to explicitly control the value of the Access-Control-Allow-Origin header, which bypasses the expected behavior of the Same Origin Policy.

CVE-2017-20146 Affected Github.com/gorilla/handlers Versions

1 component(s)
Fixed Versions:
1.3.0
Product / Package Ecosystem Affected Versions Fixed Version
github.com/gorilla/handlers
golang/github.com/gorilla/handlers
Go
< 1.3.0
1.3.0

References

NVD — CVE-2017-20146 NVD
https://nvd.nist.gov/vuln/detail/CVE-2017-20146
Github.com/gorilla/handlers Source Repository REPOSITORY
https://github.com/gorilla/handlers/pull/116
Security Fix Commit FIX COMMIT
https://github.com/gorilla/handlers/commit/90663712d74cb411cbef281bc1e08c19d1a76145
Github.com/gorilla/handlers Source Repository REPOSITORY
https://github.com/gorilla/handlers
pkg.go.dev/vuln/go-2020-0020 WEB
https://pkg.go.dev/vuln/GO-2020-0020

Frequently Asked Questions

What is CVE-2017-20146?
CVE-2017-20146 is a security vulnerability in Github.com/gorilla/handlers involving gorilla/handlers may allow requester to bypass expected behavior of the Same Origin Policy under CWE-346: Origin Validation Error.
Which Github.com/gorilla/handlers versions are affected?
Affected versions include releases prior to 1.3.0 across affected packages: github.com/gorilla/handlers.
What version fixes CVE-2017-20146?
Upgrading to 1.3.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/gorilla/handlers affected?
Yes, github.com/gorilla/handlers is affected in releases prior to 1.3.0. Upgrade your dependency to 1.3.0 or later.
What is the CVSS score of CVE-2017-20146?
CVE-2017-20146 has a CVSS v3.1 base score of 9.8 (CRITICAL) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2017-20146?
CVE-2017-20146 is classified under CWE-346: Origin Validation Error (The product does not properly verify that the source of data or communication is valid.).
How can I check Go dependencies for CVE-2017-20146?
Run the dependency tree command: 'inspect dependencies for github.com/gorilla/handlers'. 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-jcr6-mmjj-pchw",
  "modified" : "2023-01-10T15:59:32Z",
  "published" : "2022-12-28T00:30:23Z",
  "aliases" : [ "CVE-2017-20146" ],
  "summary" : "gorilla/handlers may allow requester to bypass expected behavior of the Same Origin Policy",
  "details" : "Usage of the CORS handler may apply improper CORS headers, allowing the requester to explicitly control the value of the Access-Control-Allow-Origin header, which bypasses the expected behavior of the Same Origin Policy.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/gorilla/handlers"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.3.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2017-20146"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/gorilla/handlers/pull/116"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/gorilla/handlers/commit/90663712d74cb411cbef281bc1e08c19d1a76145"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/gorilla/handlers"
  }, {
    "type" : "WEB",
    "url" : "https://pkg.go.dev/vuln/GO-2020-0020"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-346" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-12-30T19:18:39Z",
    "nvd_published_at" : "2022-12-27T22:15:00Z"
  }
}