CVE-2021-23409: Github.com/pires/go proxyproto Denial of Service Vulnerability

HIGH
Advisory Identifier: GHSA-xcf7-q56x-78gh
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CVSS 7.5
CWE-400
Published
Advisory Summary

CVE-2021-23409 is a HIGH (CVSS 7.5) denial of service vulnerability (CWE-400: Uncontrolled Resource Consumption) affecting Github.com/pires/go proxyproto libraries in the Go ecosystem. The issue involves github.com/pires/go-proxyproto vulnerable to dos via connection descriptor exhaustion. Remediation is available by upgrading affected packages to version 0.6.1.

CVE-2021-23409 at a Glance

CVE Identifier CVE-2021-23409
GHSA Identifier GHSA-xcf7-q56x-78gh
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-400: Uncontrolled Resource Consumption
Affected Product Github.com/pires/go proxyproto
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-2021-23409

To remediate this vulnerability, upgrade all affected Github.com/pires/go proxyproto 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/pires/go-proxyproto fixed: 0.6.1 
Upgrade github.com/pires/go-proxyproto to 0.6.1
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/pires/go-proxyproto

How to Check if You Are Affected

To determine whether your application is affected by CVE-2021-23409, inspect your project dependencies for Github.com/pires/go proxyproto:

inspect dependencies for github.com/pires/go-proxyproto

Analyze the terminal output to locate any version of Github.com/pires/go proxyproto in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.6.1), 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-400: Uncontrolled Resource Consumption, where the product does not properly control the allocation and maintenance of a limited resource. In Github.com/pires/go proxyproto, 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

The package `github.com/pires/go-proxyproto` before 0.6.1 is vulnerable to Denial of Service (DoS) via creating connections without the proxy protocol header. While this issue was patched in 0.6.0, the fix introduced additional issues which were subsequently patched in 0.6.1.

CVE-2021-23409 Affected Github.com/pires/go proxyproto Versions

1 component(s)
Fixed Versions:
0.6.1
Product / Package Ecosystem Affected Versions Fixed Version
github.com/pires/go-proxyproto
golang/github.com/pires/go-proxyproto
Go
< 0.6.1
0.6.1

References

NVD — CVE-2021-23409 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-23409
Github.com/pires/go proxyproto Source Repository REPOSITORY
https://github.com/pires/go-proxyproto/issues/65
Github.com/pires/go proxyproto Source Repository REPOSITORY
https://github.com/pires/go-proxyproto/issues/75
Github.com/pires/go proxyproto Source Repository REPOSITORY
https://github.com/pires/go-proxyproto/pull/74
Github.com/pires/go proxyproto Source Repository REPOSITORY
https://github.com/pires/go-proxyproto/pull/74/commits/cdc63867da24fc609b727231f682670d0d1cd346
Github.com/pires/go proxyproto Source Repository REPOSITORY
https://github.com/pires/go-proxyproto/pull/76
Security Fix Commit FIX COMMIT
https://github.com/pires/go-proxyproto/commit/2e44d7a76a851d66890ab341403253afae5caac2
Github.com/pires/go proxyproto Source Repository REPOSITORY
https://github.com/pires/go-proxyproto
Github.com/pires/go proxyproto Release RELEASE
https://github.com/pires/go-proxyproto/releases/tag/v0.6.0
Github.com/pires/go proxyproto Release RELEASE
https://github.com/pires/go-proxyproto/releases/tag/v0.6.1
pkg.go.dev/vuln/go-2022-0233 WEB
https://pkg.go.dev/vuln/GO-2022-0233
snyk.io/vuln/snyk-golang-gi... WEB
https://snyk.io/vuln/SNYK-GOLANG-GITHUBCOMPIRESGOPROXYPROTO-1316439

Frequently Asked Questions

What is CVE-2021-23409?
CVE-2021-23409 is a security vulnerability in Github.com/pires/go proxyproto involving github.com/pires/go-proxyproto vulnerable to DoS via Connection descriptor exhaustion under CWE-400: Uncontrolled Resource Consumption.
Which Github.com/pires/go proxyproto versions are affected?
Affected versions include releases prior to 0.6.1 across affected packages: github.com/pires/go-proxyproto.
What version fixes CVE-2021-23409?
Upgrading to 0.6.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/pires/go-proxyproto affected?
Yes, github.com/pires/go-proxyproto is affected in releases prior to 0.6.1. Upgrade your dependency to 0.6.1 or later.
What is the CVSS score of CVE-2021-23409?
CVE-2021-23409 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-2021-23409?
CVE-2021-23409 is classified under CWE-400: Uncontrolled Resource Consumption (The product does not properly control the allocation and maintenance of a limited resource.).
How can I check Go dependencies for CVE-2021-23409?
Run the dependency tree command: 'inspect dependencies for github.com/pires/go-proxyproto'. 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-xcf7-q56x-78gh",
  "modified" : "2023-08-30T18:51:53Z",
  "published" : "2021-07-26T21:23:49Z",
  "aliases" : [ "CVE-2021-23409" ],
  "summary" : "github.com/pires/go-proxyproto vulnerable to DoS via Connection descriptor exhaustion",
  "details" : "The package `github.com/pires/go-proxyproto` before 0.6.1 is vulnerable to Denial of Service (DoS) via creating connections without the proxy protocol header. While this issue was patched in 0.6.0, the fix introduced additional issues which were subsequently patched in 0.6.1.",
  "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/pires/go-proxyproto"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.6.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-23409"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pires/go-proxyproto/issues/65"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pires/go-proxyproto/issues/75"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pires/go-proxyproto/pull/74"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pires/go-proxyproto/pull/74/commits/cdc63867da24fc609b727231f682670d0d1cd346"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pires/go-proxyproto/pull/76"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pires/go-proxyproto/commit/2e44d7a76a851d66890ab341403253afae5caac2"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/pires/go-proxyproto"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pires/go-proxyproto/releases/tag/v0.6.0"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pires/go-proxyproto/releases/tag/v0.6.1"
  }, {
    "type" : "WEB",
    "url" : "https://pkg.go.dev/vuln/GO-2022-0233"
  }, {
    "type" : "WEB",
    "url" : "https://snyk.io/vuln/SNYK-GOLANG-GITHUBCOMPIRESGOPROXYPROTO-1316439"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-400" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-07-26T17:31:53Z",
    "nvd_published_at" : "2021-07-21T07:15:00Z"
  }
}