Amazon Linux Local Check: ALAS-2015-467

Amazon Linux Local Security Checks

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. (CVE-2004-2771, CVE-2014-7844 )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 - (so that they can be confused with mailx options). To counteract this issue, this update also introduces the -- option, which will treat the remaining command line arguments as email addresses.

Run yum update mailx to update your system.