OSEC

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Bugtraq archives for 4th quarter (Oct-Dec) 1996: Re: Security Problems in XMCD 2.1

Re: Security Problems in XMCD 2.1

Alan Cox (alanlxorguk.ukuu.org.uk)
Wed, 27 Nov 1996 20:10:35 +0000 

>         However, what attracted me to this package
>         was the optional MD5 check on your binary after
>         the ACL is verified and before the su/execution.

Better I think to alter your OS binary loader so that it looks for an
extra ELF 'MD5 signed' tag and checks it against a kernel specific key
you load. Any binary not matching it thats run uid < somevalue just
doesnt run setuid. I'd be tempted to extend that to doesnt run so you
had only a small subset of root runnable as root binaries.

Alan