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RubyGems Improper Verification of Cryptographic Signature vulnerability

Critical severity GitHub Reviewed Published May 14, 2022 to the GitHub Advisory Database • Updated Mar 8, 2023

Package

maven org.jruby:jruby-stdlib (Maven)

Affected versions

< 9.1.16.0

Patched versions

9.1.16.0
bundler rubygems-update (RubyGems)
>= 2.2.0, < 2.7.6
2.7.6

Description

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.

References

Published by the National Vulnerability Database Mar 13, 2018
Published to the GitHub Advisory Database May 14, 2022
Reviewed Mar 8, 2023
Last updated Mar 8, 2023

Severity

Critical

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS score

1.425%
(87th percentile)

Weaknesses

CVE ID

CVE-2018-1000076

GHSA ID

GHSA-mc6j-h948-v2p6

Source code

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