Vulnerabilities in pkg:gem/em-imap

PACKAGE
Advisory Identifier: GHSA-4f68-49qq-h392
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Advisory Summary

CVE-2020-13163 is a HIGH (CVSS 7.4) improper certificate validation vulnerability (CWE-295: Improper Certificate Validation) affecting Em imap libraries in the RubyGems ecosystem. The issue involves improper certificate validation in em-imap. Remediation is available in the latest vendor maintenance releases.

1 Known Advisory Record(s)
Package Vulnerability Intelligence

pkg:gem/em-imap

1 Known Advisory Record(s)

Vulnerability advisories affecting package pkg:gem/em-imap. Select an advisory below to view technical details or fixes.

Advisory ID CVE / NVD Severity Summary
GHSA-4f68-49qq-h392 CVE-2020-13163 HIGH Improper certificate validation in em-imap

CVE-2020-13163 at a Glance

CVE Identifier CVE-2020-13163
GHSA Identifier GHSA-4f68-49qq-h392
Severity HIGH
CVSS v3.1 Base Score 7.4
CWE Classification CWE-295: Improper Certificate Validation
Affected Product Em imap
Package Ecosystem RubyGems
Published Date
Last Updated

Security Impact

CVSS: 7.4

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:H/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 High (C:H)
Integrity High (I:H)
Availability None (A:N)

How to Fix CVE-2020-13163

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

em-imap fixed: Latest secure release 
Upgrade em-imap 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 em-imap

How to Check if You Are Affected

To determine whether your application is affected by CVE-2020-13163, inspect your project dependencies for Em imap:

inspect dependencies for em-imap

Analyze the terminal output to locate any version of Em imap 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 Em imap, 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

em-imap 0.5 and earlier use the library eventmachine in an insecure way that allows an attacker to perform a man-in-the-middle attack against users of the library. The hostname in a TLS server certificate is not verified.

CVE-2020-13163 Affected Em imap Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
em-imap
gem/em-imap
RubyGems
≤ 0.5

References

NVD — CVE-2020-13163 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-13163
Em imap Source Repository REPOSITORY
https://github.com/ConradIrwin/em-imap/issues/25
Em imap Source Repository REPOSITORY
https://github.com/ConradIrwin/em-imap
GitHub Advisory / Wiki ADVISORY
https://securitylab.github.com/advisories/GHSL-2020-095-conradirwin-em-imap

Frequently Asked Questions

What is CVE-2020-13163?
CVE-2020-13163 is a security vulnerability in Em imap involving Improper certificate validation in em-imap under CWE-295: Improper Certificate Validation.
Which Em imap versions are affected?
Affected versions include releases prior to current release patches across affected packages: em-imap.
What version fixes CVE-2020-13163?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is em-imap affected?
Yes, em-imap 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-2020-13163?
CVE-2020-13163 has a CVSS v3.1 base score of 7.4 (HIGH) with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N.
What CWE is associated with CVE-2020-13163?
CVE-2020-13163 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-2020-13163?
Run the dependency tree command: 'inspect dependencies for em-imap'. 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-4f68-49qq-h392",
  "modified" : "2023-09-05T21:47:52Z",
  "published" : "2021-05-24T18:12:20Z",
  "aliases" : [ "CVE-2020-13163" ],
  "summary" : "Improper certificate validation in em-imap",
  "details" : "em-imap 0.5 and earlier use the library eventmachine in an insecure way that allows an attacker to perform a man-in-the-middle attack against users of the library. The hostname in a TLS server certificate is not verified.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "RubyGems",
      "name" : "em-imap"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "0.5"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-13163"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/ConradIrwin/em-imap/issues/25"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/ConradIrwin/em-imap"
  }, {
    "type" : "ADVISORY",
    "url" : "https://securitylab.github.com/advisories/GHSL-2020-095-conradirwin-em-imap"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-295" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-05-20T22:25:15Z",
    "nvd_published_at" : "2020-05-19T22:15:00Z"
  }
}