Red Hat Security Advisory 2014-1999-01 – The mailx packages contain a mail user agent that is used to manage mail using scripts. A flaw was found in the way mailx handled the parsing of email addresses. A syntactically valid email address could allow a local attacker to cause mailx to execute arbitrary shell commands through shell meta-characters and the direct command execution functionality. Note: Applications using mailx to send email to addresses obtained from untrusted sources will still remain vulnerable to other attacks if they accept email addresses which start with “-“. To counteract this issue, this update also introduces the “–” option, which will treat the remaining command line arguments as email addresses.