The line printer daemon (lpd) in the lpr package in multiple Linux operating systems allows local users to gain root privileges by causing sendmail to execute with arbitrary command line arguments, as demonstrated using the -C option to specify a configuration file.

The line printer daemon (lpd) in the lpr package in multiple Linux operating systems authenticates by comparing the reverse-resolved hostname of the local machine to the hostname of the print server as returned by gethostname, which allows remote attackers to bypass intended access controls by modifying the DNS for the attacking IP.

inpview in InPerson on IRIX 5.3 through IRIX 6.5.10 trusts the PATH environmental variable to find and execute the ttsession program, which allows local users to obtain root access by modifying the PATH to point to a Trojan horse ttsession program.