Improper verification of cryptographic signature in Ruby - CVE-2018-1000076

Vulnerability identifier: #VU11648

CSH Severity: Low

CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2018-1000076

CWE-ID: CWE-347

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to write arbitrary files on the target system.

The weakness exists in package.rb due to improper verification of cryptographic signature. A remote attacker can install mis-signed gem, as the tarball would contain multiple gem signatures.

Ruby
Debian Linux
Amazon Linux AMI
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for Scientific Computing
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux EUS Compute Node
Red Hat Enterprise Linux for Power
Opensuse
Fedora
EMC Integrated Data Protection Appliance
Dell EMC Data Protection Search
ruby

Update to version 2.7.6.

EMC Integrated Data Protection Appliance - update to 2.7.1
Dell EMC Data Protection Search - update to 19.6.0
ruby - addressed in versions 2.4.3-87.fc26, 2.4.3-87.fc27

• https://blog.rubygems.org/2018/02/15/2.7.6-released.html

• Amazon Linux AMI update for ruby20, ruby22, ruby23, ruby24
• Debian update for jruby
• Debian update for ruby2.3
• Red Hat update for ruby
• Red Hat update for ruby
• Red Hat update for ruby
• Red Hat update for ruby
• OpenSUSE Linux update for ruby-bundled-gems-rpmhelper, ruby2.5
• Red Hat update for ruby
• Red Hat Enterprise Linux Server 7.4 update for ruby
• Red Hat Enterprise Linux 7.6 update for ruby
• Multiple vulnerabilities in Dell EMC Integrated Data Protection Appliance
• Multiple vulnerabilities in Dell EMC Data Protection Search
• Fedora 27 update for ruby
• Fedora 26 update for ruby