The _rl_tropen function in util.c in GNU readline before 6.3 patch 3 allows local users to create or overwrite arbitrary files via a symlink attack on a /var/tmp/rltrace.[PID] file.
To install Term::ReadLine::Gnu, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Term::ReadLine::Gnu
CPAN shell
perl -MCPAN -e shell install Term::ReadLine::Gnu
For more information on module installation, please visit the detailed CPAN module installation guide.