[naniwaduni]

From ChangeLog:

    * telnetd/utility.c (getterminaltype): Change the
      name `user_name' to `uname', as the former shadows a precious
     and global variable name.

[ycombinatrix]

global variables are public enemy number one

[rob74]

Congratulations! Now you've got yourself a precious and global(ly exploitable) vulnerability...