Hi, At the beginning i'd like to excuse all of you if it is commonly well known (hmm, i guess it is, but noone patched it ;>. Both DoS`s use something known as portfuck (e.g. `while true; do telnet host port & done`). 1. If you use it against any inetd service, inetd will shoutdown that service for about 30 minutes (i did not checked, but it seems to be about that time). 2. If you use it against sshd, you have 99% that you crash the mashine in few seconds. TESTED: sshd-1.2.26 on Debian 2.0 sshd-1.2.27 on Debian 2.1 sshd-1.2.27 on RedHat 5.2 inetd - one provided with Debian 2.0/2.1/Redhat 5.2 all above platforms are VULNURABLE to this attack COMPROMISE: Allows any user to hang many machines in the Internet (i guess that only these behind a firewall are secure ;> SOLUTION: propaply running in ulimit envirmont (like qmail does) should help and additionally in inetd remove this strange 'protection'. regards, greg AKA VanitaS *************************************************************************** * Grzegorz Stelmaszek * For my public PGP key: * mailto:gregat_private * finger:gregat_private * http://www.tenet.pl * 18 E9 5E 6D 78 F0 11 F2 ****************************** 45 CF CF 63 77 C0 A4 20
This archive was generated by hypermail 2b30 : Fri Apr 13 2001 - 15:01:44 PDT