[Esa-l] Detection rule for sendmail header exploit

John D. Hardin jhardin at impsec.org
Wed Mar 5 07:22:39 PST 2003

On Wed, 5 Mar 2003, John D. Hardin wrote:

> # Attempt to trap sendmail header exploit (signature as of 03/05/3003)
> #
> :0
> * ^(From|To|CC|Reply-To|Resent-From): .*<>.*<>.*<>.*<>.*<>.*\(.*\)
> | formail -A "X-Content-Security: [$HOST] NOTIFY" \
> 	  -A "X-Content-Security: [$HOST] QUARANTINE" \
> 	  -A "X-Content-Security: [$HOST] REPORT: Trapped possible
> sendmail header exploit"

D'oh! Dammit. This is, of course, wrong. Blame it on cut-and-paste and
too little caffiene. 


:0 fi

(pipe the message through formail) instead of just


If it's not a filter recipe, e.g. if you deliver to a file instead of
formail, omit the "fi" flags.

 John Hardin KA7OHZ    ICQ#15735746    http://www.impsec.org/~jhardin/
 jhardin at impsec.org                        pgpk -a jhardin at impsec.org
 key: 0xB8732E79 - 2D8C 34F4 6411 F507 136C  AF76 D822 E6E6 B873 2E79
 ...voice or no voice, the people can always be brought to the bidding
 of the leaders. That is easy. All you have to do is tell them they
 are being attacked and denounce the pacifists for lack of patriotism
 and exposing the country to danger. It works the same way in any
                                            -- Hermann Goering
   78 days until The Matrix Reloaded

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