Bugtraq mailing list archives
portmap 4.0-8 DoS
From: lcamtuf () BOSS STASZIC WAW PL (Michal Zalewski)
Date: Wed, 1 Apr 1998 17:42:33 +0200
It's possible to perform DoS attack by sending small amount of junk to tcp port 111 of machine running portmap 4.0 (and older). Simple exploit follows (only to send a few random 8-bit chars): telnet -E victim.com 111 </dev/random It will affect specific operations/services on attacked host, like login - depending on system speed, login attempt on idle machine (LA=0.01, Linux 2.0.x, x86) will take from over 10 seconds (k6/200MHz) to long minutes (486dx/80MHz). During attack, many select() calls will fail (timeout), so complex programs will become much slower (especially when resolving domain names :), but LA will not change significally. Smarter attacks (without /dev/random) are probably much more effective. -- Nergal, nie obraziles sie chiba :? _______________________________________________________________________ Michal Zalewski [lcamtuf () boss staszic waw pl] <= finger for pub PGP key Iterowac jest rzecza ludzka, wykonywac rekursywnie - boska [P. Deutsch] [echo "\$0&\$0">_;chmod +x _;./_] <=------=> [tel +48 (0) 22 813 25 86]
Current thread:
- BSD coredumps follow symlinks Denis Papp (Mar 28)
- nmap -U <host> undetectable by netranger v2.0 Codex (Apr 01)
- portmap 4.0-8 DoS Michal Zalewski (Apr 01)
- Re: portmap 4.0-8 DoS Peter van Dijk (Apr 07)
- BSDI inetd crash Mark Schaefer (Apr 07)
- Re: BSDI inetd crash FrontLine Assembly (Apr 08)
- SGI O2 ipx security issue Fabrice Planchon (Apr 08)
- BIND vulnerability test program.. Joshua J. Drake (Apr 09)
- (Q) Sun Rpcbind problem. Chiaki Ishikawa (Apr 10)
- Re: (Q) Sun Rpcbind problem. Casper Dik (Apr 10)
- Wietse's RPCBIND Wietse Venema (Apr 10)
- announce: weaken for netscape !! (fwd) Ken Williams (Apr 10)
- Communicator exploits Fernand Portela (Apr 10)