Debian Security Advisory DSA-3104-1 firstname.lastname@example.org http://www.debian.org/security/ Florian Weimer December 16, 2014 http://www.debian.org/security/faq
Package : bsd-mailx CVE ID : CVE-2014-7844
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.
Users who need this feature can re-enable it using the "expandaddr" in an appropriate mailrc file. This update also removes the obsolete -T option. An older security vulnerability, CVE-2004-2771, had already been addressed in the Debian's bsd-mailx package.
Note that this security update does not remove all mailx facilities for command execution, though. Scripts which send mail to addresses obtained from an untrusted source (such as a web form) should use the "--" separator before the email addresses (which was fixed to work properly in this update), or they should be changed to invoke "mail -t" or "sendmail -i -t" instead, passing the recipient addresses as part of the mail header.
For the stable distribution (wheezy), this problem has been fixed in version 8.1.2-0.20111106cvs-1+deb7u1.
We recommend that you upgrade your bsd-mailx packages.
Further information about Debian Security Advisories, how to apply these updates to your system and frequently asked questions can be found at: https://www.debian.org/security/
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