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Debian DSA-3104-1 Critical Vulnerability in Bsd-Mailx Execution Risk

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. . -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 - ------------------------------------------------------------------------- Debian Security Advisory DSA-3104-1 This email address is being protected from spambots. You need JavaScript enabled to view it. 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/ Mailing list: This email address is being protected from spambots. You need JavaScript enabled to view it. . Uncover the Debian DSA-3105-1 notice concerning bsd-mailx, which tackles a severe execution flawin managing emails.. bsd-mailx update, debian security, email command issue. . Severity: Critical. LinuxSecurity.com Team

Dec 16, 2014 •Critical Debian