Re: Root shell vixie cron exploit

[lcamtuf () DIONE IDS PL (Michal Zalewski)]

On Wed, 1 Sep 1999, Seva Gluschenko wrote:

> man sendmail:
> /-C
> ...skipping...
>       -Cfile  Use alternate configuration file.  Sendmail refuses to run
>               as root if an alternate configuration file is specified.
>
> and it does, for sure %-).
>
> Just tested this on different versions of FreeBSD and had no effects
> except Mail Delivery message:
>
> The following address has permanent fatal errors:
> -C/tmp/vixie-cf gvs
>
> So, sendmail _really_ refuses to accept -C key when run as root

Probably you have some problems with understanding written word ;P REFUSES
TO RUN AS ROOT means: if alternate config file is specified, effective
root privledges (Setuid) are dropped. But from crond, sendmail is launched
with uid==euid==0. DOES NOT apply. FreeBSD seems to be patched against
this attack, that's another issue ;P

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