CVE-2018-1000076: Rubygems update RubyGems Improper Verification Of Cryptographic Vulnerability

CRITICAL
Advisory Identifier: GHSA-mc6j-h948-v2p6
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CVSS 9.8
CWE-347
Published
Advisory Summary

CVE-2018-1000076 is a CRITICAL (CVSS 9.8) rubygems improper verification of cryptographic vulnerability (CWE-347: Improper Verification of Cryptographic Signature) affecting Rubygems update libraries in the RubyGems ecosystem. The issue involves rubygems improper verification of cryptographic signature vulnerability. Remediation is available by upgrading affected packages to version 2.7.6, 9.1.16.0.

CVE-2018-1000076 at a Glance

CVE Identifier CVE-2018-1000076
GHSA Identifier GHSA-mc6j-h948-v2p6
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification CWE-347: Improper Verification of Cryptographic Signature
Affected Product Rubygems update
Package Ecosystem RubyGems
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:3.0/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-2018-1000076

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: 2.7.6 
Upgrade rubygems-update to 2.7.6
org.jruby:jruby-stdlib fixed: 9.1.16.0 
<dependency>
    <groupId>org.jruby</groupId>
    <artifactId>jruby-stdlib</artifactId>
    <version>9.1.16.0</version>
</dependency>
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-2018-1000076, 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 2.7.6), 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-347: Improper Verification of Cryptographic Signature, where the product does not verify, or incorrectly verifies, the cryptographic signature for data. 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

RubyGems version Ruby 2.2 series: 2.2.9 and earlier, Ruby 2.3 series: 2.3.6 and earlier, Ruby 2.4 series: 2.4.3 and earlier, and Ruby 2.5 series: 2.5.0 and earlier, prior to trunk revision 62422 contain an Improper Verification of Cryptographic Signature vulnerability in package.rb. This can result in a mis-signed gem being installed, as the tarball would contain multiple gem signatures. This vulnerability has been fixed in 2.7.6.

CVE-2018-1000076 Affected Rubygems update Versions

2 component(s)
Fixed Versions:
2.7.69.1.16.0
Product / Package Ecosystem Affected Versions Fixed Version
rubygems-update
gem/rubygems-update
RubyGems
≥ 2.2.0
< 2.7.6
2.7.6
org.jruby:jruby-stdlib
maven/org.jruby/jruby-stdlib
Maven
< 9.1.16.0
9.1.16.0

References

NVD — CVE-2018-1000076 NVD
https://nvd.nist.gov/vuln/detail/CVE-2018-1000076
Security Fix Commit FIX COMMIT
https://github.com/jruby/jruby/commit/0b06b48ab4432237ce5fc1bef47f2c6bcf7843f7
Security Fix Commit FIX COMMIT
https://github.com/rubygems/rubygems/commit/f5042b879259b1f1ce95a0c5082622c646376693
Rubygems update Security Information SECURITY
https://www.debian.org/security/2018/dsa-4259
Rubygems update Security Information SECURITY
https://www.debian.org/security/2018/dsa-4219
usn.ubuntu.com/3621-1 WEB
https://usn.ubuntu.com/3621-1
lists.debian.org/debian-lts-announce... WEB
https://lists.debian.org/debian-lts-announce/2019/05/msg00028.html
lists.debian.org/debian-lts-announce... WEB
https://lists.debian.org/debian-lts-announce/2018/07/msg00012.html
lists.debian.org/debian-lts-announce... WEB
https://lists.debian.org/debian-lts-announce/2018/04/msg00023.html
lists.debian.org/debian-lts-announce... WEB
https://lists.debian.org/debian-lts-announce/2018/04/msg00001.html
lists.debian.org/debian-lts-announce... WEB
https://lists.debian.org/debian-lts-announce/2018/04/msg00000.html
Rubygems update Source Repository REPOSITORY
https://github.com/rubygems/rubygems
access.redhat.com/errata/rhsa-2020:06... WEB
https://access.redhat.com/errata/RHSA-2020:0663
access.redhat.com/errata/rhsa-2020:05... WEB
https://access.redhat.com/errata/RHSA-2020:0591
access.redhat.com/errata/rhsa-2020:05... WEB
https://access.redhat.com/errata/RHSA-2020:0542
access.redhat.com/errata/rhsa-2019:20... WEB
https://access.redhat.com/errata/RHSA-2019:2028
access.redhat.com/errata/rhsa-2018:37... WEB
https://access.redhat.com/errata/RHSA-2018:3731
access.redhat.com/errata/rhsa-2018:37... WEB
https://access.redhat.com/errata/RHSA-2018:3730
access.redhat.com/errata/rhsa-2018:37... WEB
https://access.redhat.com/errata/RHSA-2018:3729
blog.rubygems.org/2018/02/15/2.7.6-re... WEB
http://blog.rubygems.org/2018/02/15/2.7.6-released.html
Rubygems update Security Information SECURITY
http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00036.html

Frequently Asked Questions

What is CVE-2018-1000076?
CVE-2018-1000076 is a security vulnerability in Rubygems update involving RubyGems Improper Verification of Cryptographic Signature vulnerability under CWE-347: Improper Verification of Cryptographic Signature.
Which Rubygems update versions are affected?
Affected versions include releases prior to 2.7.6, 9.1.16.0 across affected packages: rubygems-update, org.jruby:jruby-stdlib.
What version fixes CVE-2018-1000076?
Upgrading to 2.7.6, 9.1.16.0 (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 2.7.6. Upgrade your dependency to 2.7.6 or later.
Is jruby-stdlib affected?
Yes, org.jruby:jruby-stdlib is affected in releases prior to 9.1.16.0. Upgrade your dependency to 9.1.16.0 or later.
What is the CVSS score of CVE-2018-1000076?
CVE-2018-1000076 has a CVSS v3.1 base score of 9.8 (CRITICAL) with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2018-1000076?
CVE-2018-1000076 is classified under CWE-347: Improper Verification of Cryptographic Signature (The product does not verify, or incorrectly verifies, the cryptographic signature for data.).
How can I check RubyGems dependencies for CVE-2018-1000076?
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-mc6j-h948-v2p6",
  "modified" : "2023-03-08T19:49:18Z",
  "published" : "2022-05-14T01:01:12Z",
  "aliases" : [ "CVE-2018-1000076" ],
  "summary" : "RubyGems Improper Verification of Cryptographic Signature vulnerability",
  "details" : "RubyGems version Ruby 2.2 series: 2.2.9 and earlier, Ruby 2.3 series: 2.3.6 and earlier, Ruby 2.4 series: 2.4.3 and earlier, and Ruby 2.5 series: 2.5.0 and earlier, prior to trunk revision 62422 contain an Improper Verification of Cryptographic Signature vulnerability in package.rb. This can result in a mis-signed gem being installed, as the tarball would contain multiple gem signatures. This vulnerability has been fixed in 2.7.6.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
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      "name" : "rubygems-update"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
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        "introduced" : "2.2.0"
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      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Maven",
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    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
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      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2018-1000076"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/jruby/jruby/commit/0b06b48ab4432237ce5fc1bef47f2c6bcf7843f7"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/rubygems/rubygems/commit/f5042b879259b1f1ce95a0c5082622c646376693"
  }, {
    "type" : "WEB",
    "url" : "https://www.debian.org/security/2018/dsa-4259"
  }, {
    "type" : "WEB",
    "url" : "https://www.debian.org/security/2018/dsa-4219"
  }, {
    "type" : "WEB",
    "url" : "https://usn.ubuntu.com/3621-1"
  }, {
    "type" : "WEB",
    "url" : "https://lists.debian.org/debian-lts-announce/2019/05/msg00028.html"
  }, {
    "type" : "WEB",
    "url" : "https://lists.debian.org/debian-lts-announce/2018/07/msg00012.html"
  }, {
    "type" : "WEB",
    "url" : "https://lists.debian.org/debian-lts-announce/2018/04/msg00023.html"
  }, {
    "type" : "WEB",
    "url" : "https://lists.debian.org/debian-lts-announce/2018/04/msg00001.html"
  }, {
    "type" : "WEB",
    "url" : "https://lists.debian.org/debian-lts-announce/2018/04/msg00000.html"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/rubygems/rubygems"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2020:0663"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2020:0591"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2020:0542"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2019:2028"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2018:3731"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2018:3730"
  }, {
    "type" : "WEB",
    "url" : "https://access.redhat.com/errata/RHSA-2018:3729"
  }, {
    "type" : "WEB",
    "url" : "http://blog.rubygems.org/2018/02/15/2.7.6-released.html"
  }, {
    "type" : "WEB",
    "url" : "http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00036.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-347" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-03-08T19:49:18Z",
    "nvd_published_at" : "2018-03-13T15:29:00Z"
  }
}