Stolen from: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=291376

Cdrtools has some code (and default configuration) that suggests users that 
want to debug its behaviour to open up a can of worms associate to insecure 
temporary files usage. The Debug file defined in the configuration will 
just be fopened() without any checks and is thus vulnerable to symlink 
attacks.

The attached patch tries to fix this minor bug (not many users will really 
enabled DEBUG) by introducing a check in rscsi.c to avoid being vulnerable 
to symlink attacks and by modifying the provided config file telling users 
to use safe locations for debug files. The patch introduces a DoS condition 
(if somebody has created the file the program will exit) and that's why 
users are suggested (in the comments of the configuration file) to use a 
safe location (not /tmp) for debugging.