5 ms·

Is there a way to send a secure attention command to su/sudo to protect against this?

• iopuy 14y ago
  Echo the LD_PRELOAD environment variable first and check for anything suspect.
  • lordlicorice 14y ago
    Unless the shared object file also includes an override for the function that expands environment variables to lie about the true value of LD_PRELOAD.
  • est 14y ago
    the twist: echo is also hijacked...
    • deleted 14y ago
      [deleted]
    • iopuy 14y ago
      Okay... just type "Export" then.
      • DannyBee 14y ago
        okay, so now the getenv call is hijacked too. You can play this game all day, as long as the environment is stored in user space, you can get it and fake the output.
• AYBABTME 14y ago
  One way I can think of would be with a 2-factor authentication, such as: http://wiki.gentoo.org/wiki/Google_Authenticator http://wiki.gentoo.org/wiki/Google_Authenticator
• Spidler 14y ago
  Well, su/Sudo are suid bit programs, so that means LD_PRELOAD doesn't work on them
  • pea-tear 14y ago
    That's what this app does, it uses LD_PRELOAD to perform keylogging on both non-suid and suid apps.