Internet Message (IM) consists of a set of user interface commands and backend Perl5 libraries to integrate email and the NetNews user interface. These commands are designed to be used from both the Mew mail reader for Emacs and the command line.
A vulnerability has been discovered by Tatsuya Kinoshita in the way two IM utilities create temporary files. By anticipating the names used to create files and directories stored in the /tmp directory, it may be possible for a local attacker to corrupt or modify data as another user.
Users of IM are advised to install these packages which contain a backported patch to correct these issues.