Re: Linux zero IP ID vulnerability?

2006-03-17 Thread Marco Ivaldi
Hi Marco! Hey Andrea, - [PIRELLI HOME ACCESS GATEWAY] Based on your tests, this device shows the standard incremental IP ID behaviour: so, nothing special here. - [MY BOX WITH 2.6.15.6 #1 i686 pentium4 GNU/Linux (vanilla)] [snip] (closed port + S flag) [EMAIL PROTECTED]:~$ cat

Re: Linux zero IP ID vulnerability?

2006-03-16 Thread Andrea Purificato - bunker
Alle 10:33, martedì 14 marzo 2006, Marco Ivaldi ha scritto: I've recently stumbled upon an interesting behaviour of some Linux kernels that may be exploited by a remote attacker to abuse the ID field of IP packets, effectively bypassing the zero IP ID in DF packets countermeasure implemented

Re: Linux zero IP ID vulnerability?

2006-03-15 Thread Marco Ivaldi
I've received a couple of off-list replies. See my comments in-line. On Tue, 14 Mar 2006, Martin Mačok wrote: Have you verified that the sequence is global and not only per peer? The latter would mean that vuln can't be used as a middle-man for IDLE scanning... Yeah, of course i've verified

Linux zero IP ID vulnerability?

2006-03-14 Thread Marco Ivaldi
Hello Bugtraq, I've recently stumbled upon an interesting behaviour of some Linux kernels that may be exploited by a remote attacker to abuse the ID field of IP packets, effectively bypassing the zero IP ID in DF packets countermeasure implemented since 2.4.8 (IIRC). This is the correct