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suid not working

2007-12-25 11:39:00

suid programs and shell scripts are a security hole and hence not always allowed.

>From your replies I gathered this information:

   ksh will allow suid

   sh will not allow suid

   csh will allow suid (with the option -b). E.g. the first line of the script should

        be:

           #!/bin/csh -b

        This causes a break from option processing so that it is a little bit more

        secure (see man csh, look for -b).

   perl allows suid

In the documentation on

   http://docs.sun.com

I found a small note when reading about setuid Permission:

"Using setuid permission with the reserved UIDs(0-99) from a program may not set the

 effective UID correctly. Use a shell script instead or avoid using the reserved UIDs

 with setuid permissions."

This solved my problem. The user I was using had by mistake been added with one of the reserved UIDs. After deleting that user, adding another with a higher UID, and changing ownership of all relevant files, everything worked as it was supposed to.

Nils Martinsson e-mail: nils.martinsson@senet.mail.abb.com

System Engineer

Panorama Applications

ABB Network Partner

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