cve/2017/CVE-2017-17790.md

### [CVE-2017-17790](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-17790)
![](https://img.shields.io/static/v1?label=Product&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Vulnerability&message=n%2Fa&color=brighgreen)

### Description

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.

### POC

#### Reference
- https://github.com/ruby/ruby/pull/1777
- https://github.com/ruby/ruby/pull/1777

#### Github
- https://github.com/ARPSyndicate/cvemon