Important: ruby20, ruby21, ruby24

Issue Overview:

An issue was discovered in RubyGems. The gem owner command outputs the contents of the API response directly to stdout. Therefore, if the response is crafted, escape sequence injection may occur.(CVE-2019-8322)

An issue was discovered in RubyGems. Gem::GemcutterUtilities#with_response may output the API response to stdout as it is. Therefore, if the API side modifies the response, escape sequence injection may occur.(CVE-2019-8323)

An issue was discovered in RubyGems. Since Gem::UserInteraction#verbose calls say without escaping, escape sequence injection is possible.(CVE-2019-8321)

A Directory Traversal issue was discovered in RubyGems. Before making new directories or touching files (which now include path-checking code for symlinks), it would delete the target destination. If that destination was hidden behind a symlink, a malicious gem could delete arbitrary files on the user’s machine, presuming the attacker could guess at paths. Given how frequently gem is run as sudo, and how predictable paths are on modern systems (/tmp, /usr, etc.), this could likely lead to data loss or an unusable system.(CVE-2019-8320)

An issue was discovered in RubyGems. A crafted gem with a multi-line name is not handled correctly. Therefore, an attacker could inject arbitrary code to the stub line of gemspec, which is eval-ed by code in ensure_loadable_spec during the preinstall check.(CVE-2019-8324)

An issue was discovered in RubyGems. Since Gem::CommandManager#run calls alert_error without escaping, escape sequence injection is possible. (There are many ways to cause an error.)(CVE-2019-8325)

Affected Packages:

ruby20, ruby21, ruby24

Issue Correction:
Run yum update ruby20 to update your system.
Run yum update ruby21 to update your system.
Run yum update ruby24 to update your system.

New Packages:

i686:  
    ruby20-libs-2.0.0.648-1.32.amzn1.i686  
    ruby20-debuginfo-2.0.0.648-1.32.amzn1.i686  
    rubygem20-bigdecimal-1.2.0-1.32.amzn1.i686  
    ruby20-devel-2.0.0.648-1.32.amzn1.i686  
    rubygem20-psych-2.0.0-1.32.amzn1.i686  
    rubygem20-io-console-0.4.2-1.32.amzn1.i686  
    ruby20-2.0.0.648-1.32.amzn1.i686  
    ruby21-2.1.9-1.22.amzn1.i686  
    rubygem21-bigdecimal-1.2.4-1.22.amzn1.i686  
    ruby21-debuginfo-2.1.9-1.22.amzn1.i686  
    rubygem21-io-console-0.4.3-1.22.amzn1.i686  
    ruby21-devel-2.1.9-1.22.amzn1.i686  
    rubygem21-psych-2.0.5-1.22.amzn1.i686  
    ruby21-libs-2.1.9-1.22.amzn1.i686  
    ruby24-2.4.5-1.30.11.amzn1.i686  
    rubygem24-json-2.0.4-1.30.11.amzn1.i686  
    rubygem24-bigdecimal-1.3.2-1.30.11.amzn1.i686  
    ruby24-debuginfo-2.4.5-1.30.11.amzn1.i686  
    rubygem24-io-console-0.4.6-1.30.11.amzn1.i686  
    rubygem24-psych-2.2.2-1.30.11.amzn1.i686  
    ruby24-libs-2.4.5-1.30.11.amzn1.i686  
    rubygem24-xmlrpc-0.2.1-1.30.11.amzn1.i686  
    ruby24-devel-2.4.5-1.30.11.amzn1.i686  
  
noarch:  
    ruby20-irb-2.0.0.648-1.32.amzn1.noarch  
    ruby20-doc-2.0.0.648-1.32.amzn1.noarch  
    rubygems20-devel-2.0.14.1-1.32.amzn1.noarch  
    rubygems20-2.0.14.1-1.32.amzn1.noarch  
    ruby21-irb-2.1.9-1.22.amzn1.noarch  
    rubygems21-devel-2.2.5-1.22.amzn1.noarch  
    ruby21-doc-2.1.9-1.22.amzn1.noarch  
    rubygems21-2.2.5-1.22.amzn1.noarch  
    rubygems24-2.6.14.3-1.30.11.amzn1.noarch  
    rubygem24-did_you_mean-1.1.0-1.30.11.amzn1.noarch  
    rubygems24-devel-2.6.14.3-1.30.11.amzn1.noarch  
    ruby24-doc-2.4.5-1.30.11.amzn1.noarch  
    ruby24-irb-2.4.5-1.30.11.amzn1.noarch  
  
src:  
    ruby20-2.0.0.648-1.32.amzn1.src  
    ruby21-2.1.9-1.22.amzn1.src  
    ruby24-2.4.5-1.30.11.amzn1.src  
  
x86_64:  
    ruby20-devel-2.0.0.648-1.32.amzn1.x86_64  
    rubygem20-bigdecimal-1.2.0-1.32.amzn1.x86_64  
    ruby20-debuginfo-2.0.0.648-1.32.amzn1.x86_64  
    rubygem20-io-console-0.4.2-1.32.amzn1.x86_64  
    ruby20-2.0.0.648-1.32.amzn1.x86_64  
    rubygem20-psych-2.0.0-1.32.amzn1.x86_64  
    ruby20-libs-2.0.0.648-1.32.amzn1.x86_64  
    rubygem21-psych-2.0.5-1.22.amzn1.x86_64  
    ruby21-devel-2.1.9-1.22.amzn1.x86_64  
    ruby21-libs-2.1.9-1.22.amzn1.x86_64  
    ruby21-debuginfo-2.1.9-1.22.amzn1.x86_64  
    rubygem21-bigdecimal-1.2.4-1.22.amzn1.x86_64  
    ruby21-2.1.9-1.22.amzn1.x86_64  
    rubygem21-io-console-0.4.3-1.22.amzn1.x86_64  
    rubygem24-json-2.0.4-1.30.11.amzn1.x86_64  
    ruby24-devel-2.4.5-1.30.11.amzn1.x86_64  
    ruby24-debuginfo-2.4.5-1.30.11.amzn1.x86_64  
    rubygem24-bigdecimal-1.3.2-1.30.11.amzn1.x86_64  
    rubygem24-io-console-0.4.6-1.30.11.amzn1.x86_64  
    ruby24-2.4.5-1.30.11.amzn1.x86_64  
    ruby24-libs-2.4.5-1.30.11.amzn1.x86_64  
    rubygem24-xmlrpc-0.2.1-1.30.11.amzn1.x86_64  
    rubygem24-psych-2.2.2-1.30.11.amzn1.x86_64  

Additional References

Red Hat: CVE-2019-8320, CVE-2019-8321, CVE-2019-8322, CVE-2019-8323, CVE-2019-8324, CVE-2019-8325

Mitre: CVE-2019-8320, CVE-2019-8321, CVE-2019-8322, CVE-2019-8323, CVE-2019-8324, CVE-2019-8325