Details for this vulnerability have not been published by NIST at this point. Descriptions from software vendor advisories for this issue are provided below.
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. (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.
All mailx users are advised to upgrade to these updated packages, which contain backported patches to correct these issues.
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