Bugtraq mailing list archives
Re: sendmail 8.9.3 patches to curb RCPT harvesters
From: achurch () DRAGONFIRE NET (Andy Church)
Date: Sat, 13 Mar 1999 11:36:32 EST
Per Joseph's suggestion. Use these patches against sendmail 8.9.3 and add O RCPTFailDelay=30 to sendmail.cf to make sendmail sleep() for 30 seconds before reporting any "550" errors. Set the value to 0 for "normal" behavior.According to the reports I'm seeing, GeoList Pro does not wait for a response from the server -- instead, it streams the RCPT TO commands continuously and then reads the results at the end of transmission. If that is the case, it doesn't sound like this patch will have any effect.
It should work fine, because (1) sendmail won't process anything while it's sleep()ing, and (2) GeoList will stop sending data when the socket buffer fills up (because sendmail isn't reading from it). --Andy Church achurch () dragonfire net http://achurch.dragonfire.net/
Current thread:
- sendmail 8.9.3 patches to curb RCPT harvesters Peter W (Mar 11)
- Re: sendmail 8.9.3 patches to curb RCPT harvesters Tim Pierce (Mar 12)
- <Possible follow-ups>
- Re: sendmail 8.9.3 patches to curb RCPT harvesters Peter W (Mar 13)
- Re: sendmail 8.9.3 patches to curb RCPT harvesters Andy Church (Mar 13)
- /usr/bin/doscmd on BSDI kasper (Mar 13)
- Re: /usr/bin/doscmd on BSDI Warner Losh (Mar 17)
- Re: sendmail 8.9.3 patches to curb RCPT harvesters Aggelos P. Varvitsiotis (Mar 15)
- Lynx 2.8 overflow Mixter (Mar 15)
- ISS Security Advisory: LDAP Buffer overflow against Microsoft X-Force (Mar 16)
- Microsoft Security Bulletin (MS99-009) aleph1 () UNDERGROUND ORG (Mar 16)
- /usr/bin/doscmd on BSDI kasper (Mar 13)