Hola, On Mon, Nov 15, 1999 at 12:23:26PM +0000, Ricard Sierra wrote: > A mi se me ocurre utilizar super y un script donde descargues los modulos > del > ppp y llames al programa de captura de la camara. A parte puedes indicar los > usuarios que tienen derecho a ejecutar el comando. La verdad es que super va > muy > bien para cosas como esta (montar el cdrom, hacer un halt, reboot, etc.. sin > tener que entrar como root).
A prop�sito de super, s� que mucha gente usa 'sudo' para hacer esto mismo. Yo tambi�n prefiero super, pero al grano. En la lista de seguridad unix de kript�polis ha llegado lo siguiente, supongo que es bueno compartirlo: ---------- Forwarded message ---------- Date: Thu, 11 Nov 1999 21:38:21 -0600 (CST) From: Wade Maxfield <[EMAIL PROTECTED]> To: [email protected] Subject: [linux-security] security hole in sudo allows users full access Resent-Date: 12 Nov 1999 08:04:16 -0000 Resent-From: [email protected] Resent-cc: recipient list not shown: ; While sudo is used to give fairly trusted users the ability to run programs with root privs, there exists a hole in the one in the RedHat contrib directory (sudo 1.5.9.p4) which allows a minimally trusted user to obtain full root access and privilege. If a user is given the opportunity to run any program, that user can fool sudo and obtain any level of privilege for any executable. Assume the user can run "/bin/treport" as listed in the sudoers file. (The actual program name does not matter.) the user copies /bin/vi to ./treport (assuming the user is in a directory in which he has write and execute priv.) the user then executes the following line: sudo ./treport /etc/shadow vi is executed with root privilege and shadow is opened. The full path of treport is not required. The correct path of treport is not required. This program should be restricted only to _very_ trusted users in the meantime. wade [mod: Note that many operations that normally require "root" will "give away" root when allowed under "sudo" with a little puzzeling. This, however, is unforgivable..... -- REW] -------------------------------------------------------------------- Para quien no entienda ingl�s, un bug en sudo permite enga�arle ya que no comprueba el path del ejecutable, as� que si tienes permiso en sudoers para ejecutar "foo", haces "cp /bin/vi ~/foo" "y luego "./foo /etc/shadow" y ale, editando como root. No lo he comprobado, si alguien usa sudo, que lo haga y comente. En fin, el mensaje es alto y claro: No le des sudo a nadie del que no conf�es plenamente. Salut, Jordi
pgp5tLNRiuJqi.pgp
Description: PGP signature
