CVE-2020-36564: Github.com/justinas/nosurf Nosurf Vulnerable To Improper Input Vulnerability

HIGH
Advisory Identifier: GHSA-5x84-q523-vvwr
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CVSS 7.5
CWE-20
Published
Advisory Summary

CVE-2020-36564 is a HIGH (CVSS 7.5) nosurf vulnerable to improper input vulnerability (CWE-20: Improper Input Validation) affecting Github.com/justinas/nosurf libraries in the Go ecosystem. The issue involves nosurf vulnerable to improper input validation. Remediation is available by upgrading affected packages to version 1.1.1.

CVE-2020-36564 at a Glance

CVE Identifier CVE-2020-36564
GHSA Identifier GHSA-5x84-q523-vvwr
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-20: Improper Input Validation
Affected Product Github.com/justinas/nosurf
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:H/A:N).

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 High (I:H)
Availability None (A:N)

How to Fix CVE-2020-36564

To remediate this vulnerability, upgrade all affected Github.com/justinas/nosurf 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/justinas/nosurf fixed: 1.1.1 
Upgrade github.com/justinas/nosurf to 1.1.1
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/justinas/nosurf

How to Check if You Are Affected

To determine whether your application is affected by CVE-2020-36564, inspect your project dependencies for Github.com/justinas/nosurf:

inspect dependencies for github.com/justinas/nosurf

Analyze the terminal output to locate any version of Github.com/justinas/nosurf in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.1.1), 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-20: Improper Input Validation, where the product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. In Github.com/justinas/nosurf, 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

Due to improper validation of caller input, validation is silently disabled if the provided expected token is malformed, causing any user supplied token to be considered valid.

CVE-2020-36564 Affected Github.com/justinas/nosurf Versions

1 component(s)
Fixed Versions:
1.1.1
Product / Package Ecosystem Affected Versions Fixed Version
github.com/justinas/nosurf
golang/github.com/justinas/nosurf
Go
< 1.1.1
1.1.1

References

NVD — CVE-2020-36564 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-36564
Github.com/justinas/nosurf Source Repository REPOSITORY
https://github.com/justinas/nosurf/pull/60
Security Fix Commit FIX COMMIT
https://github.com/justinas/nosurf/commit/4d86df7a4affa1fa50ab39fb09aac56c3ce9c314
Github.com/justinas/nosurf Source Repository REPOSITORY
https://github.com/justinas/nosurf
pkg.go.dev/vuln/go-2020-0049 WEB
https://pkg.go.dev/vuln/GO-2020-0049

Frequently Asked Questions

What is CVE-2020-36564?
CVE-2020-36564 is a security vulnerability in Github.com/justinas/nosurf involving nosurf vulnerable to improper input validation under CWE-20: Improper Input Validation.
Which Github.com/justinas/nosurf versions are affected?
Affected versions include releases prior to 1.1.1 across affected packages: github.com/justinas/nosurf.
What version fixes CVE-2020-36564?
Upgrading to 1.1.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/justinas/nosurf affected?
Yes, github.com/justinas/nosurf is affected in releases prior to 1.1.1. Upgrade your dependency to 1.1.1 or later.
What is the CVSS score of CVE-2020-36564?
CVE-2020-36564 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:H/A:N.
What CWE is associated with CVE-2020-36564?
CVE-2020-36564 is classified under CWE-20: Improper Input Validation (The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.).
How can I check Go dependencies for CVE-2020-36564?
Run the dependency tree command: 'inspect dependencies for github.com/justinas/nosurf'. 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-5x84-q523-vvwr",
  "modified" : "2023-01-10T15:55:56Z",
  "published" : "2022-12-28T00:30:23Z",
  "aliases" : [ "CVE-2020-36564" ],
  "summary" : "nosurf vulnerable to improper input validation",
  "details" : "Due to improper validation of caller input, validation is silently disabled if the provided expected token is malformed, causing any user supplied token to be considered valid.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/justinas/nosurf"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.1.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-36564"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/justinas/nosurf/pull/60"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/justinas/nosurf/commit/4d86df7a4affa1fa50ab39fb09aac56c3ce9c314"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/justinas/nosurf"
  }, {
    "type" : "WEB",
    "url" : "https://pkg.go.dev/vuln/GO-2020-0049"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-20" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-12-30T19:06:40Z",
    "nvd_published_at" : "2022-12-27T22:15:00Z"
  }
}