CVE-2020-27813: Github.com/gorilla/websocket Integer Overflow Vulnerability

HIGH
Advisory Identifier: GHSA-3xh2-74w9-5vxm
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CVSS 7.5
CWE-190 CWE-400
Published
Advisory Summary

CVE-2020-27813 is a HIGH (CVSS 7.5) integer overflow vulnerability (CWE-190: Integer Overflow or Wraparound) affecting Github.com/gorilla/websocket libraries in the Go ecosystem. The issue involves integer overflow in github.com/gorilla/websocket. Remediation is available by upgrading affected packages to version 1.4.1.

CVE-2020-27813 at a Glance

CVE Identifier CVE-2020-27813
GHSA Identifier GHSA-3xh2-74w9-5vxm
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-190: Integer Overflow or Wraparound
Affected Product Github.com/gorilla/websocket
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-2020-27813

To remediate this vulnerability, upgrade all affected Github.com/gorilla/websocket 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/websocket fixed: 1.4.1 
Upgrade github.com/gorilla/websocket to 1.4.1
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/gorilla/websocket

How to Check if You Are Affected

To determine whether your application is affected by CVE-2020-27813, inspect your project dependencies for Github.com/gorilla/websocket:

inspect dependencies for github.com/gorilla/websocket

Analyze the terminal output to locate any version of Github.com/gorilla/websocket in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.4.1), 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-190: Integer Overflow or Wraparound, where the product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. this occurs when an integer value is incremented to a value that is too large to store in the associated representation. when this occurs, the value may become a very small or negative number. In Github.com/gorilla/websocket, 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 integer overflow vulnerability exists with the length of websocket frames received via a websocket connection. An attacker would use this flaw to cause a denial of service attack on an HTTP Server allowing websocket connections.

CVE-2020-27813 Affected Github.com/gorilla/websocket Versions

1 component(s)
Fixed Versions:
1.4.1
Product / Package Ecosystem Affected Versions Fixed Version
github.com/gorilla/websocket
golang/github.com/gorilla/websocket
Go
< 1.4.1
1.4.1

References

GitHub Advisory / Wiki ADVISORY
https://github.com/gorilla/websocket/security/advisories/GHSA-jf24-p9p9-4rjh
NVD — CVE-2020-27813 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-27813
Github.com/gorilla/websocket Source Repository REPOSITORY
https://github.com/gorilla/websocket/pull/537
Security Fix Commit FIX COMMIT
https://github.com/gorilla/websocket/commit/5b740c29263eb386f33f265561c8262522f19d37
bugzilla.redhat.com/show_bug.cgi WEB
https://bugzilla.redhat.com/show_bug.cgi?id=1902111
Github.com/gorilla/websocket Source Repository REPOSITORY
https://github.com/gorilla/websocket
lists.debian.org/debian-lts-announce... WEB
https://lists.debian.org/debian-lts-announce/2021/01/msg00008.html
pkg.go.dev/vuln/go-2020-0019 WEB
https://pkg.go.dev/vuln/GO-2020-0019

Frequently Asked Questions

What is CVE-2020-27813?
CVE-2020-27813 is a security vulnerability in Github.com/gorilla/websocket involving Integer overflow in github.com/gorilla/websocket under CWE-190: Integer Overflow or Wraparound.
Which Github.com/gorilla/websocket versions are affected?
Affected versions include releases prior to 1.4.1 across affected packages: github.com/gorilla/websocket.
What version fixes CVE-2020-27813?
Upgrading to 1.4.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/gorilla/websocket affected?
Yes, github.com/gorilla/websocket is affected in releases prior to 1.4.1. Upgrade your dependency to 1.4.1 or later.
What is the CVSS score of CVE-2020-27813?
CVE-2020-27813 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-2020-27813?
CVE-2020-27813 is classified under CWE-190: Integer Overflow or Wraparound (The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.).
How can I check Go dependencies for CVE-2020-27813?
Run the dependency tree command: 'inspect dependencies for github.com/gorilla/websocket'. 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-3xh2-74w9-5vxm",
  "modified" : "2023-02-09T19:37:02Z",
  "published" : "2021-05-18T21:08:02Z",
  "aliases" : [ "CVE-2020-27813" ],
  "summary" : "Integer overflow in github.com/gorilla/websocket",
  "details" : "An integer overflow vulnerability exists with the length of websocket frames received via a websocket connection. An attacker would use this flaw to cause a denial of service attack on an HTTP Server allowing websocket connections.",
  "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/gorilla/websocket"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.4.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/gorilla/websocket/security/advisories/GHSA-jf24-p9p9-4rjh"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-27813"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/gorilla/websocket/pull/537"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/gorilla/websocket/commit/5b740c29263eb386f33f265561c8262522f19d37"
  }, {
    "type" : "WEB",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=1902111"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/gorilla/websocket"
  }, {
    "type" : "WEB",
    "url" : "https://lists.debian.org/debian-lts-announce/2021/01/msg00008.html"
  }, {
    "type" : "WEB",
    "url" : "https://pkg.go.dev/vuln/GO-2020-0019"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-190", "CWE-400" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-05-18T20:56:17Z",
    "nvd_published_at" : "2020-12-02T01:15:12Z"
  }
}