CVE-2019-20786: Github.com/pion/dtls Improper Authenication Vulnerability

CRITICAL
Advisory Identifier: GHSA-7gfg-6934-mqq2
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CVSS 9.8
CWE-287
Published
Advisory Summary

CVE-2019-20786 is a CRITICAL (CVSS 9.8) improper authenication vulnerability (CWE-287: Improper Authentication) affecting Github.com/pion/dtls libraries in the Go ecosystem. The issue involves improper authenication in pion dtls. Remediation is available by upgrading affected packages to version 1.5.2.

CVE-2019-20786 at a Glance

CVE Identifier CVE-2019-20786
GHSA Identifier GHSA-7gfg-6934-mqq2
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification CWE-287: Improper Authentication
Affected Product Github.com/pion/dtls
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-2019-20786

To remediate this vulnerability, upgrade all affected Github.com/pion/dtls 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/pion/dtls fixed: 1.5.2 
Upgrade github.com/pion/dtls to 1.5.2
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/pion/dtls

How to Check if You Are Affected

To determine whether your application is affected by CVE-2019-20786, inspect your project dependencies for Github.com/pion/dtls:

inspect dependencies for github.com/pion/dtls

Analyze the terminal output to locate any version of Github.com/pion/dtls in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.5.2), 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-287: Improper Authentication, where when an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. In Github.com/pion/dtls, 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

handleIncomingPacket in conn.go in Pion DTLS before 1.5.2 lacks a check for application data with epoch 0, which allows remote attackers to inject arbitrary unencrypted data after handshake completion.

CVE-2019-20786 Affected Github.com/pion/dtls Versions

1 component(s)
Fixed Versions:
1.5.2
Product / Package Ecosystem Affected Versions Fixed Version
github.com/pion/dtls
golang/github.com/pion/dtls
Go
< 1.5.2
1.5.2

References

NVD — CVE-2019-20786 NVD
https://nvd.nist.gov/vuln/detail/CVE-2019-20786
Github.com/pion/dtls Source Repository REPOSITORY
https://github.com/pion/dtls/pull/128
Security Fix Commit FIX COMMIT
https://github.com/pion/dtls/commit/fd73a5df2ff0e1fb6ae6a51e2777d7a16cc4f4e0
Github.com/pion/dtls Source Repository REPOSITORY
https://github.com/pion/dtls
Github.com/pion/dtls Source Repository REPOSITORY
https://github.com/pion/dtls/compare/v1.5.1...v1.5.2
pkg.go.dev/vuln/go-2020-0038 WEB
https://pkg.go.dev/vuln/GO-2020-0038
Github.com/pion/dtls Security Information SECURITY
https://www.usenix.org/conference/usenixsecurity20/presentation/fiterau-brostean
www.usenix.org/system/files/sec20f... WEB
https://www.usenix.org/system/files/sec20fall_fiterau-brostean_prepub.pdf

Frequently Asked Questions

What is CVE-2019-20786?
CVE-2019-20786 is a security vulnerability in Github.com/pion/dtls involving Improper Authenication in Pion DTLS under CWE-287: Improper Authentication.
Which Github.com/pion/dtls versions are affected?
Affected versions include releases prior to 1.5.2 across affected packages: github.com/pion/dtls.
What version fixes CVE-2019-20786?
Upgrading to 1.5.2 (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/pion/dtls affected?
Yes, github.com/pion/dtls is affected in releases prior to 1.5.2. Upgrade your dependency to 1.5.2 or later.
What is the CVSS score of CVE-2019-20786?
CVE-2019-20786 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-2019-20786?
CVE-2019-20786 is classified under CWE-287: Improper Authentication (When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.).
How can I check Go dependencies for CVE-2019-20786?
Run the dependency tree command: 'inspect dependencies for github.com/pion/dtls'. 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-7gfg-6934-mqq2",
  "modified" : "2023-02-14T00:18:06Z",
  "published" : "2021-06-29T21:34:57Z",
  "aliases" : [ "CVE-2019-20786" ],
  "summary" : "Improper Authenication in Pion DTLS",
  "details" : "handleIncomingPacket in conn.go in Pion DTLS before 1.5.2 lacks a check for application data with epoch 0, which allows remote attackers to inject arbitrary unencrypted data after handshake completion.",
  "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/pion/dtls"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.5.2"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2019-20786"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pion/dtls/pull/128"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pion/dtls/commit/fd73a5df2ff0e1fb6ae6a51e2777d7a16cc4f4e0"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/pion/dtls"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pion/dtls/compare/v1.5.1...v1.5.2"
  }, {
    "type" : "WEB",
    "url" : "https://pkg.go.dev/vuln/GO-2020-0038"
  }, {
    "type" : "WEB",
    "url" : "https://www.usenix.org/conference/usenixsecurity20/presentation/fiterau-brostean"
  }, {
    "type" : "WEB",
    "url" : "https://www.usenix.org/system/files/sec20fall_fiterau-brostean_prepub.pdf"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-287" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-05-25T19:54:18Z",
    "nvd_published_at" : null
  }
}