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Fencer Intel
critical 9.8

CVE-2018-1000076 json

RubyGems Improper Verification of Cryptographic Signature vulnerability

published 8y ago modified 4mo ago also GHSA-mc6j-h948-v2p6 , EUVD-2022-4540

cvss
9.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.9%
EPSS 2.9% chance of exploitation in 30 days, percentile 87%
public exploits
0
none known

Summary

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, Ruby 2.5 series: 2.5.0 and earlier, prior to trunk revision 62422 contains a Improper Verification of Cryptographic Signature vulnerability in package.rb that can result in a mis-signed gem could be installed, as the tarball would contain multiple gem signatures.. This vulnerability appears to have been fixed in 2.7.6.

Patch / fix

  • rubygems rubygems-update 2.7.6
  • maven org.jruby:jruby-stdlib 9.1.16.0
  • jruby Debian 14, Debian 13, Debian 12 9.1.17.0-1
  • rubygems Debian 14, Debian 13, Debian 12 3.2.0~rc.1-1

debian advisories DEBIAN-CVE-2018-1000076

  • ruby2.0 Ubuntu 14.04 LTS 2.0.0.484-1ubuntu2.6
  • ruby2.3 Ubuntu 16.04 LTS 2.3.1-2~16.04.7
  • jruby Ubuntu Pro 14.04 LTS 1.5.6-9+deb8u2build0.14.04.1~esm2

ubuntu advisories UBUNTU-CVE-2018-1000076

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • ruby RHEL 7 2.0.0.648-36.el7
  • ruby-irb RHEL 7 2.0.0.648-36.el7
  • rubygems RHEL 7 2.0.14.1-36.el7
  • ruby-libs RHEL 7 2.0.0.648-36.el7
  • ruby-tcltk RHEL 7 2.0.0.648-36.el7
  • rubygem-json RHEL 7 1.7.7-36.el7
  • rubygem-rake RHEL 7 0.9.6-36.el7
  • rubygem-rdoc RHEL 7 4.0.0-36.el7

red hat advisories RHSA-2020:0663RHSA-2020:0591RHSA-2020:0542RHSA-2019:2028RHSA-2018:3729RHSA-2018:3730

  • ruby2.1 SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES for SAP 12 SP3 +14 more 2.1.9-19.3.2
  • yast2-ruby-bindings SLES for SAP 12 SP2, SLES 12 SP2-LTSS, SLES 12 SP2-BCL +1 more 3.1.53-9.8.1
  • ruby2.5 SLE Module for Basesystem 15 SP1, SLE Module for Basesystem 15 2.5.5-4.3.1

suse advisories SUSE-SU-2020:1570-1SUSE-SU-2019:1804-1

  • ruby2.5 openSUSE Leap 15.1, openSUSE Leap 15.0 2.5.5-lp151.4.3.1
  • ruby-bundled-gems-rpmhelper openSUSE Leap 15.1, openSUSE Leap 15.0 0.0.2-lp151.2.1

opensuse advisories openSUSE-SU-2019:1771-1

Is CVE-2018-1000076 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2018-1000076 updated cvss 5.5

rubygems: Improper verification of signatures in tarball allows to install mis-signed gem

  • Red Hat Enterprise Linux 6 rubygems Red Hat Enterprise MRG 2 rubygems Red Hat Satellite 6 rubygems Red Hat Subscription Asset Manager ruby193-rubygems
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux Client (v. 7) ruby 2.0.0.648-36.el7, rubygems 2.0.14.1-36.el7, ruby-irb 2.0.0.648-36.el7, rubygem-json 1.7.7-36.el7, rubygem-rdoc 4.0.0-36.el7, ruby-libs 2.0.0.648-36.el7, +3 more Red Hat Enterprise Linux Client Optional (v. 7) rubygem-rake 0.9.6-36.el7, ruby-tcltk 2.0.0.648-36.el7, rubygem-minitest 4.3.2-36.el7 Red Hat Enterprise Linux ComputeNode (v. 7) ruby 2.0.0.648-36.el7, rubygems 2.0.14.1-36.el7, ruby-irb 2.0.0.648-36.el7, rubygem-json 1.7.7-36.el7, rubygem-rdoc 4.0.0-36.el7, ruby-libs 2.0.0.648-36.el7, +3 more
    fixed: vendor fix RHSA-2019:2028
  • Red Hat Enterprise Linux ComputeNode EUS (v. 7.5) ruby 2.0.0.648-35.el7_5, rubygems 2.0.14.1-35.el7_5, ruby-irb 2.0.0.648-35.el7_5, rubygem-json 1.7.7-35.el7_5, rubygem-rdoc 4.0.0-35.el7_5, ruby-libs 2.0.0.648-35.el7_5, +3 more
    fixed: vendor fix RHSA-2020:0542
  • Red Hat Enterprise Linux ComputeNode EUS (v. 7.6) ruby 2.0.0.648-36.el7_6, rubygems 2.0.14.1-36.el7_6, ruby-irb 2.0.0.648-36.el7_6, rubygem-json 1.7.7-36.el7_6, rubygem-rdoc 4.0.0-36.el7_6, ruby-libs 2.0.0.648-36.el7_6, +3 more
    fixed: vendor fix RHSA-2020:0663
  • Red Hat Enterprise Linux ComputeNode Optional (v. 7) rubygem-rake 0.9.6-36.el7, ruby-tcltk 2.0.0.648-36.el7, rubygem-minitest 4.3.2-36.el7
    fixed: vendor fix RHSA-2019:2028
  • Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.5) rubygem-rake 0.9.6-35.el7_5, ruby-tcltk 2.0.0.648-35.el7_5, rubygem-minitest 4.3.2-35.el7_5
    fixed: vendor fix RHSA-2020:0542
  • Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.6) rubygem-rake 0.9.6-36.el7_6, ruby-tcltk 2.0.0.648-36.el7_6, rubygem-minitest 4.3.2-36.el7_6 Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) ruby 2.0.0.648-36.el7_6, rubygems 2.0.14.1-36.el7_6, ruby-irb 2.0.0.648-36.el7_6, rubygem-json 1.7.7-36.el7_6, rubygem-rdoc 4.0.0-36.el7_6, ruby-libs 2.0.0.648-36.el7_6, +3 more Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) rubygem-rake 0.9.6-36.el7_6, ruby-tcltk 2.0.0.648-36.el7_6, rubygem-minitest 4.3.2-36.el7_6
    fixed: vendor fix RHSA-2020:0663
  • Red Hat Enterprise Linux Server (v. 7) ruby 2.0.0.648-36.el7, rubygems 2.0.14.1-36.el7, ruby-irb 2.0.0.648-36.el7, rubygem-json 1.7.7-36.el7, rubygem-rdoc 4.0.0-36.el7, ruby-libs 2.0.0.648-36.el7, +3 more
    fixed: vendor fix RHSA-2019:2028
show 11 more
  • Red Hat Enterprise Linux Server AUS (v. 7.4) ruby 2.0.0.648-35.el7_4, rubygems 2.0.14.1-35.el7_4, ruby-irb 2.0.0.648-35.el7_4, rubygem-json 1.7.7-35.el7_4, rubygem-rdoc 4.0.0-35.el7_4, ruby-libs 2.0.0.648-35.el7_4, +3 more Red Hat Enterprise Linux Server E4S (v. 7.4) ruby 2.0.0.648-35.el7_4, rubygems 2.0.14.1-35.el7_4, ruby-irb 2.0.0.648-35.el7_4, rubygem-json 1.7.7-35.el7_4, rubygem-rdoc 4.0.0-35.el7_4, ruby-libs 2.0.0.648-35.el7_4, +3 more
    fixed: vendor fix RHSA-2020:0591
  • Red Hat Enterprise Linux Server EUS (v. 7.5) ruby 2.0.0.648-35.el7_5, rubygems 2.0.14.1-35.el7_5, ruby-irb 2.0.0.648-35.el7_5, rubygem-json 1.7.7-35.el7_5, rubygem-rdoc 4.0.0-35.el7_5, ruby-libs 2.0.0.648-35.el7_5, +3 more
    fixed: vendor fix RHSA-2020:0542
  • Red Hat Enterprise Linux Server EUS (v. 7.6) ruby 2.0.0.648-36.el7_6, rubygems 2.0.14.1-36.el7_6, ruby-irb 2.0.0.648-36.el7_6, rubygem-json 1.7.7-36.el7_6, rubygem-rdoc 4.0.0-36.el7_6, ruby-libs 2.0.0.648-36.el7_6, +3 more
    fixed: vendor fix RHSA-2020:0663
  • Red Hat Enterprise Linux Server Optional (v. 7) rubygem-rake 0.9.6-36.el7, ruby-tcltk 2.0.0.648-36.el7, rubygem-minitest 4.3.2-36.el7
    fixed: vendor fix RHSA-2019:2028
  • Red Hat Enterprise Linux Server Optional AUS (v. 7.4) rubygem-rake 0.9.6-35.el7_4, ruby-tcltk 2.0.0.648-35.el7_4, rubygem-minitest 4.3.2-35.el7_4 Red Hat Enterprise Linux Server Optional E4S (v. 7.4) rubygem-rake 0.9.6-35.el7_4, ruby-tcltk 2.0.0.648-35.el7_4, rubygem-minitest 4.3.2-35.el7_4
    fixed: vendor fix RHSA-2020:0591
  • Red Hat Enterprise Linux Server Optional EUS (v. 7.5) rubygem-rake 0.9.6-35.el7_5, ruby-tcltk 2.0.0.648-35.el7_5, rubygem-minitest 4.3.2-35.el7_5
    fixed: vendor fix RHSA-2020:0542
  • Red Hat Enterprise Linux Server Optional EUS (v. 7.6) rubygem-rake 0.9.6-36.el7_6, ruby-tcltk 2.0.0.648-36.el7_6, rubygem-minitest 4.3.2-36.el7_6
    fixed: vendor fix RHSA-2020:0663
  • Red Hat Enterprise Linux Server Optional TUS (v. 7.4) rubygem-rake 0.9.6-35.el7_4, ruby-tcltk 2.0.0.648-35.el7_4, rubygem-minitest 4.3.2-35.el7_4 Red Hat Enterprise Linux Server TUS (v. 7.4) ruby 2.0.0.648-35.el7_4, rubygems 2.0.14.1-35.el7_4, ruby-irb 2.0.0.648-35.el7_4, rubygem-json 1.7.7-35.el7_4, rubygem-rdoc 4.0.0-35.el7_4, ruby-libs 2.0.0.648-35.el7_4, +3 more
    fixed: vendor fix RHSA-2020:0591
  • Red Hat Enterprise Linux Workstation (v. 7) ruby 2.0.0.648-36.el7, rubygems 2.0.14.1-36.el7, ruby-irb 2.0.0.648-36.el7, rubygem-json 1.7.7-36.el7, rubygem-rdoc 4.0.0-36.el7, ruby-libs 2.0.0.648-36.el7, +3 more Red Hat Enterprise Linux Workstation Optional (v. 7) rubygem-rake 0.9.6-36.el7, ruby-tcltk 2.0.0.648-36.el7, rubygem-minitest 4.3.2-36.el7
    fixed: vendor fix RHSA-2019:2028
  • Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 6) rh-ruby23-ruby 2.3.8-69.el6, rh-ruby24-ruby 2.4.5-91.el6, rh-ruby23-ruby-irb 2.3.8-69.el6, rh-ruby24-ruby-irb 2.4.5-91.el6, rh-ruby23-ruby-libs 2.3.8-69.el6, rh-ruby24-ruby-libs 2.4.5-91.el6, +27 more Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7) rh-ruby25-ruby 2.5.3-6.el7, rh-ruby23-ruby 2.3.8-69.el7, rh-ruby24-ruby 2.4.5-91.el7, rh-ruby25-ruby-irb 2.5.3-6.el7, rh-ruby25-rubygems 2.7.6-6.el7, rh-ruby23-ruby-irb 2.3.8-69.el7, +44 more Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.4) rh-ruby25-ruby 2.5.3-6.el7, rh-ruby23-ruby 2.3.8-69.el7, rh-ruby24-ruby 2.4.5-91.el7, rh-ruby25-ruby-irb 2.5.3-6.el7, rh-ruby25-rubygems 2.7.6-6.el7, rh-ruby23-ruby-irb 2.3.8-69.el7, +44 more Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.5) rh-ruby25-ruby 2.5.3-6.el7, rh-ruby23-ruby 2.3.8-69.el7, rh-ruby24-ruby 2.4.5-91.el7, rh-ruby25-ruby-irb 2.5.3-6.el7, rh-ruby25-rubygems 2.7.6-6.el7, rh-ruby23-ruby-irb 2.3.8-69.el7, +44 more Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.6) rh-ruby25-ruby 2.5.3-6.el7, rh-ruby23-ruby 2.3.8-69.el7, rh-ruby24-ruby 2.4.5-91.el7, rh-ruby25-ruby-irb 2.5.3-6.el7, rh-ruby25-rubygems 2.7.6-6.el7, rh-ruby23-ruby-irb 2.3.8-69.el7, +44 more Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 6) rh-ruby23-ruby 2.3.8-69.el6, rh-ruby24-ruby 2.4.5-91.el6, rh-ruby23-ruby-irb 2.3.8-69.el6, rh-ruby24-ruby-irb 2.4.5-91.el6, rh-ruby23-ruby-libs 2.3.8-69.el6, rh-ruby24-ruby-libs 2.4.5-91.el6, +27 more
    +1 more products
    Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7) rh-ruby25-ruby 2.5.3-6.el7, rh-ruby23-ruby 2.3.8-69.el7, rh-ruby24-ruby 2.4.5-91.el7, rh-ruby25-ruby-irb 2.5.3-6.el7, rh-ruby25-rubygems 2.7.6-6.el7, rh-ruby23-ruby-irb 2.3.8-69.el7, +44 more
    fixed: vendor fix RHSA-2018:3729
  • Red Hat Enterprise Linux 8 ruby, ruby-irb, rubygems, ruby-libs, rubygem-pg, rubygem-irb, +25 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

2.93% chance of exploitation in the next 30 days, higher than 87% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.0 9.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P
GitHub 3.0 9.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
rubygems rubygems-update
>=2.2.0, <2.7.6
2.7.6
maven org.jruby:jruby-stdlib
<9.1.16.0
9.1.16.0

Classification

Weakness
  • CWE-347 Improper Verification of Cryptographic Signature

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.