Gentoo Linux Security Advisory 201804-6 - Multiple vulnerabilities were discovered in mailx, the worst of which may allow a remote attacker to execute arbitrary commands. Versions less than 8.1.2.20160123 are affected.
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Slackware Security Advisory - New mailx packages are available for Slackware 13.0, 13.1, 13.37, 14.0, 14.1, and -current to fix security issues.
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Apple Security Advisory 2015-08-13-2 - OS X Yosemite 10.10.5 and Security Update 2015-006 is now available and addresses vulnerabilities in Apache, the OD plug-in, IOBluetoothHCIController, and more.
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Mandriva Linux Security Advisory 2015-011 - 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.
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Ubuntu Security Notice 2455-1 - It was discovered that bsd-mailx contained a feature that allowed syntactically valid email addresses to be treated as shell commands. A remote attacker could possibly use this issue with a valid email address to execute arbitrary commands. This functionality has now been disabled by default, and can be re-enabled with the "expandaddr" configuration option. This update alone does not remove all possibilities of command execution. In environments where scripts use mailx to process arbitrary email addresses, it is recommended to modify them to use a "--" separator before the address to properly handle those that begin with "-". Various other issues were also addressed.
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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.
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Debian Linux Security Advisory 3105-1 - Two security vulnerabilities were discovered in Heirloom mailx, an implementation of the "mail" command.
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Debian Linux Security Advisory 3104-1 - It was discovered that bsd-mailx, an implementation of the "mail" command, had an undocumented feature which treats syntactically valid email addresses as shell commands to execute.
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