fcrontab in fcron before 3.0.5 allows local users to read arbitrary files via a symlink attack on an unspecified file.

The convert-fcrontab program in fcron 3.0.0 might allow local users to gain privileges via a long command-line argument, which causes Linux glibc to report heap memory corruption, possibly because a strcpy in the strdup2 function can "overwrite some data."

convert-fcrontab in Fcron 2.9.5 and 3.0.0 allows remote attackers to create or overwrite arbitrary files via ".." sequences and a symlink attack on the temporary file that is used during conversion.