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Category:   Application (Generic)  >   Ruby Vendors:   Matsumoto, Yukihiro
Ruby 'Array#pack' Lets Remote Users Bypass Security Restrictions on the Target System
SecurityTracker Alert ID:  1042106
SecurityTracker URL:  http://securitytracker.com/id/1042106
CVE Reference:   CVE-2018-16396   (Links to External Site)
Date:  Nov 13 2018
Impact:   Host/resource access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in Ruby. A remote user can bypass security controls on the target system.

A remote user can supply a specially crafted Array#pack and String#unpack array to cause the target system to fail to properly check security controls. The B, b, H, and h directives are not properly propagated.

Chris Seaton reported this vulnerability.

Impact:   A remote user can bypass security controls on the target system.
Solution:   The vendor has issued a source code fix (r65125) [in October 2018].

The vendor advisory is available at:

https://www.ruby-lang.org/en/news/2018/10/17/not-propagated-taint-flag-in-some-formats-of-pack-cve-2018-16396/

Vendor URL:  www.ruby-lang.org/en/news/2018/10/17/not-propagated-taint-flag-in-some-formats-of-pack-cve-2018-16396/ (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Any), UNIX (Any), Windows (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Nov 29 2018 (Red Hat Issues Fix) Ruby 'Array#pack' Lets Remote Users Bypass Security Restrictions on the Target System
Red Hat has issued a fix for Red Hat Enterprise Linux 6, 7, 7.4, 7.5, and 7.6.



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