CVE-2018-1000074

Published: 13 March 2018

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 Deserialization of Untrusted Data vulnerability in owner command that can result in code execution. This attack appear to be exploitable via victim must run the `gem owner` command on a gem with a specially crafted YAML file. This vulnerability appears to have been fixed in 2.7.6.

From the Ubuntu security team

It was discovered that the RubyGems embedded in JRuby would deserialize unsafe objects in untrusted YAML. If a user were tricked into using the `gem owner` command on a malicious ruby gem, JRuby could execute a malicious payload.

Notes

ruby{1.9.1,2.0,2.3} and jruby ship an embedded rubygems.

Priority

Medium

CVSS 3 base score: 7.8

Status

References

• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-1000074
• https://github.com/rubygems/rubygems/commit/254e3d0ee873c008c0b74e8b8abcbdab4caa0a6d
• https://www.ruby-lang.org/en/news/2018/02/17/multiple-vulnerabilities-in-rubygems/
• https://ubuntu.com/security/notices/USN-3621-1
• https://ubuntu.com/security/notices/USN-3621-2
• https://ubuntu.com/security/notices/USN-3685-1
• NVD
• Launchpad
• Debian