The message function in lib/webbynode/notify.rb in the Webbynode gem 1.0.5.3 and earlier for Ruby allows context-dependent attackers to execute arbitrary commands via shell metacharacters in a growlnotify message.
archives.neohapsis.com/archives/bugtraq/2013-12/0079.html
osvdb.org/100920
packetstormsecurity.com/files/124421
seclists.org/oss-sec/2013/q4/493
seclists.org/oss-sec/2013/q4/497
www.securityfocus.com/bid/64289
www.vapid.dhs.org/advisories/webbynode-command-inj.html
exchange.xforce.ibmcloud.com/vulnerabilities/89705
github.com/webbynode/webbynode/pull/85