The lazy_initialize function in lib/resolv.rb in Ruby through 2.4.3 uses Kernel#open, which might allow Command Injection attacks, as demonstrated by a Resolv::Hosts::new argument beginning with a '|' character, a different vulnerability than CVE-2017-17405. NOTE: situations with untrusted input may be highly unlikely.

Affected: Ubuntu:14.04:LTS: ruby1.9.1, Ubuntu:16.04:LTS: ruby2.3

It was discovered that Ruby incorrectly handled certain terminal emulator escape sequences. An attacker could use this to execute arbitrary code via a crafted user name. This issue only affected Ubuntu 16.04 LTS and Ubuntu 17.10. (CVE-2017-10784)

It was discovered that Ruby incorrectly handled certain strings. An attacker could use this to cause a denial of service. This issue only affected Ubuntu 16.04 LTS and Ubuntu 17.10. (CVE-2017-14033)

It was discovered that Ruby incorrectly handled some generating JSON. An attacker could use this to possible expose sensitive information. This issue only affected Ubuntu 16.04 LTS and Ubuntu 17.10. (CVE-2017-14064)

It was discovered that Ruby incorrectly handled certain inputs. An attacker could use this to execute arbitrary code. (CVE-2017-17790)