CVE-2020-24393: Tweetstream Improper Certificate Validation Vulnerability

MODERATE
Advisory Identifier: GHSA-6hrm-jqp3-64cv
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CVSS 5.9
CWE-295
Published
Advisory Summary

CVE-2020-24393 is a MODERATE (CVSS 5.9) improper certificate validation vulnerability (CWE-295: Improper Certificate Validation) affecting Tweetstream libraries in the RubyGems ecosystem. The issue involves improper certificate validation in tweetstream. Remediation is available in the latest vendor maintenance releases.

CVE-2020-24393 at a Glance

CVE Identifier CVE-2020-24393
GHSA Identifier GHSA-6hrm-jqp3-64cv
Severity MODERATE
CVSS v3.1 Base Score 5.9
CWE Classification CWE-295: Improper Certificate Validation
Affected Product Tweetstream
Package Ecosystem RubyGems
Published Date
Last Updated

Security Impact

CVSS: 5.9

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N).

Attack Vector Network (AV:N)
Attack Complexity High (AC:H)
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-2020-24393

To remediate this vulnerability, upgrade all affected Tweetstream dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

tweetstream fixed: Latest secure release 
Upgrade tweetstream to Latest secure release
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 tweetstream

How to Check if You Are Affected

To determine whether your application is affected by CVE-2020-24393, inspect your project dependencies for Tweetstream:

inspect dependencies for tweetstream

Analyze the terminal output to locate any version of Tweetstream in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), 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-295: Improper Certificate Validation, where the product does not validate, or incorrectly validates, a certificate. In Tweetstream, 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

TweetStream 2.6.1 uses the library eventmachine in an insecure way that does not have TLS hostname validation. This allows an attacker to perform a man-in-the-middle attack.

CVE-2020-24393 Affected Tweetstream Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
tweetstream
gem/tweetstream
RubyGems
≤ 2.6.1

References

NVD — CVE-2020-24393 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-24393
Tweetstream Source Repository REPOSITORY
https://github.com/tweetstream/tweetstream
GitHub Advisory / Wiki ADVISORY
https://securitylab.github.com/advisories/GHSL-2020-096-tweetstream-tweetstream

Frequently Asked Questions

What is CVE-2020-24393?
CVE-2020-24393 is a security vulnerability in Tweetstream involving Improper Certificate Validation in TweetStream under CWE-295: Improper Certificate Validation.
Which Tweetstream versions are affected?
Affected versions include releases prior to current release patches across affected packages: tweetstream.
What version fixes CVE-2020-24393?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is tweetstream affected?
Yes, tweetstream is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.
What is the CVSS score of CVE-2020-24393?
CVE-2020-24393 has a CVSS v3.1 base score of 5.9 (MODERATE) with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N.
What CWE is associated with CVE-2020-24393?
CVE-2020-24393 is classified under CWE-295: Improper Certificate Validation (The product does not validate, or incorrectly validates, a certificate.).
How can I check RubyGems dependencies for CVE-2020-24393?
Run the dependency tree command: 'inspect dependencies for tweetstream'. 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-6hrm-jqp3-64cv",
  "modified" : "2023-01-26T22:35:31Z",
  "published" : "2021-04-13T15:42:36Z",
  "aliases" : [ "CVE-2020-24393" ],
  "summary" : "Improper Certificate Validation in TweetStream",
  "details" : "TweetStream 2.6.1 uses the library eventmachine in an insecure way that does not have TLS hostname validation. This allows an attacker to perform a man-in-the-middle attack.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "RubyGems",
      "name" : "tweetstream"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "2.6.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-24393"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/tweetstream/tweetstream"
  }, {
    "type" : "ADVISORY",
    "url" : "https://securitylab.github.com/advisories/GHSL-2020-096-tweetstream-tweetstream"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-295" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-03-29T22:54:38Z",
    "nvd_published_at" : "2021-02-19T23:15:00Z"
  }
}