CVE-2019-8324: Rubygems update Code Injection Vulnerability

Q: What is CVE-2019-8324?

CVE-2019-8324 is a security vulnerability in Rubygems update involving Code injection in RubyGems under CWE-94: Improper Control of Generation of Code ('Code Injection').

Q: Which Rubygems update versions are affected?

Affected versions include releases prior to 2.7.9, 3.0.2 across affected packages: rubygems-update.

Q: What version fixes CVE-2019-8324?

Upgrading to 2.7.9, 3.0.2 (or the latest patched release for your respective branch) resolves the vulnerability.

Q: Is rubygems-update affected?

Yes, rubygems-update is affected in releases prior to 2.7.9, 3.0.2. Upgrade your dependency to 2.7.9, 3.0.2 or later.

Q: What is the CVSS score of CVE-2019-8324?

CVE-2019-8324 has a CVSS v3.1 base score of 8.8 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

Q: What CWE is associated with CVE-2019-8324?

CVE-2019-8324 is classified under CWE-94: Improper Control of Generation of Code ('Code Injection') (The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.).

Q: How can I check RubyGems dependencies for CVE-2019-8324?

Run the dependency tree command: 'inspect dependencies for rubygems-update'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.

HIGH

Advisory Identifier: GHSA-76wm-422q-92mq

CVSS 8.8

CWE-94

Published 2019-06-20

Advisory Summary

CVE-2019-8324 is a HIGH (CVSS 8.8) code injection vulnerability (CWE-94: Improper Control of Generation of Code ('Code Injection')) affecting Rubygems update libraries in the RubyGems ecosystem. The issue involves code injection in rubygems. Remediation is available by upgrading affected packages to version 2.7.9, 3.0.2.

CVE-2019-8324 at a Glance

CVE Identifier CVE-2019-8324

GHSA Identifier GHSA-76wm-422q-92mq

Severity HIGH

CVSS v3.1 Base Score 8.8

CWE Classification CWE-94: Improper Control of Generation of Code ('Code Injection')

Affected Product Rubygems update

Package Ecosystem RubyGems

Published Date 2019-06-20

Last Updated 2021-08-17

Security Impact

CVSS: 8.8

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:R/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 Required (UI:R)

Scope Unchanged (S:U)

Confidentiality High (C:H)

Integrity High (I:H)

Availability High (A:H)

How to Fix CVE-2019-8324

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

rubygems-update fixed: 2.7.9

Upgrade rubygems-update to 2.7.9

rubygems-update fixed: 3.0.2

Upgrade rubygems-update to 3.0.2

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 rubygems-update

How to Check if You Are Affected

To determine whether your application is affected by CVE-2019-8324, inspect your project dependencies for Rubygems update:

inspect dependencies for rubygems-update

Analyze the terminal output to locate any version of Rubygems update in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.7.9), 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-94: Improper Control of Generation of Code ('Code Injection'), where the product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment. In Rubygems update, 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 issue was discovered in RubyGems 2.6 and later through 3.0.2. A crafted gem with a multi-line name is not handled correctly. Therefore, an attacker could inject arbitrary code to the stub line of gemspec, which is eval-ed by code in ensure_loadable_spec during the preinstall check.

CVE-2019-8324 Affected Rubygems update Versions

2 component(s)

Fixed Versions:

2.7.93.0.2

Product / Package	Ecosystem	Affected Versions	Fixed Version
rubygems-update gem/rubygems-update	RubyGems	≥ 2.6.0 < 2.7.9	2.7.9
rubygems-update gem/rubygems-update	RubyGems	≥ 3.0.0 < 3.0.2	3.0.2

References

NVD — CVE-2019-8324 NVD

https://nvd.nist.gov/vuln/detail/CVE-2019-8324

access.redhat.com/errata/rhsa-2019:19... WEB

https://access.redhat.com/errata/RHSA-2019:1972

Rubygems update Security Information SECURITY

https://blog.rubygems.org/2019/03/05/security-advisories-2019-03.html

Rubygems update Source Repository REPOSITORY

https://github.com/rubysec/ruby-advisory-db/blob/master/gems/rubygems-update/CVE-2019-8324.yml

lists.debian.org/debian-lts-announce... WEB

https://lists.debian.org/debian-lts-announce/2020/08/msg00027.html

Rubygems update Security Information SECURITY

http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00036.html

Frequently Asked Questions

What is CVE-2019-8324?

CVE-2019-8324 is a security vulnerability in Rubygems update involving Code injection in RubyGems under CWE-94: Improper Control of Generation of Code ('Code Injection').

Which Rubygems update versions are affected?

Affected versions include releases prior to 2.7.9, 3.0.2 across affected packages: rubygems-update.

What version fixes CVE-2019-8324?

Upgrading to 2.7.9, 3.0.2 (or the latest patched release for your respective branch) resolves the vulnerability.

Is rubygems-update affected?

Yes, rubygems-update is affected in releases prior to 2.7.9, 3.0.2. Upgrade your dependency to 2.7.9, 3.0.2 or later.

What is the CVSS score of CVE-2019-8324?

CVE-2019-8324 has a CVSS v3.1 base score of 8.8 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

What CWE is associated with CVE-2019-8324?

CVE-2019-8324 is classified under CWE-94: Improper Control of Generation of Code ('Code Injection') (The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.).

How can I check RubyGems dependencies for CVE-2019-8324?

Run the dependency tree command: 'inspect dependencies for rubygems-update'. 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-76wm-422q-92mq",
  "modified" : "2021-08-17T13:42:04Z",
  "published" : "2019-06-20T16:06:11Z",
  "aliases" : [ "CVE-2019-8324" ],
  "summary" : "Code injection in RubyGems",
  "details" : "An issue was discovered in RubyGems 2.6 and later through 3.0.2. A crafted gem with a multi-line name is not handled correctly. Therefore, an attacker could inject arbitrary code to the stub line of gemspec, which is eval-ed by code in ensure_loadable_spec during the preinstall check.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "RubyGems",
      "name" : "rubygems-update"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.6.0"
      }, {
        "fixed" : "2.7.9"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "RubyGems",
      "name" : "rubygems-update"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "3.0.0"
      }, {
        "fixed" : "3.0.2"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2019-8324"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2019:1972"
  }, {
    "type" : "WEB",
    "url" : "https://blog.rubygems.org/2019/03/05/security-advisories-2019-03.html"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/rubysec/ruby-advisory-db/blob/master/gems/rubygems-update/CVE-2019-8324.yml"
  }, {
    "type" : "WEB",
    "url" : "https://lists.debian.org/debian-lts-announce/2020/08/msg00027.html"
  }, {
    "type" : "WEB",
    "url" : "http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00036.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-94" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2019-06-20T16:01:22Z",
    "nvd_published_at" : null
  }
}

CVSS V3

8.8 HIGH