North American Network Operators Group
Date Prev | Date Next |
Date Index |
Thread Index |
Author Index |
Historical
Re: TCP/BGP vulnerability - easier than you think
- From: Petri Helenius
- Date: Fri Apr 23 11:51:22 2004
Leo Bicknell wrote:
I point out NetBSD released this:
ftp://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2004-006.txt.asc
Of interest is this paragraph:
] Additionally, the 4.4BSD stack from which NetBSD's stack is derived, did
] not even check that a RST's sequence number was inside the window. RSTs
] anywhere to the left of the window were treated as valid.
It's a good thing the 4.4BSD stack was unpopular, otherwise it might be
in a lot of programs.
Most code bases fixed this much earlier, like FreeBSD in 1998;
http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/netinet/tcp_input.c.diff?r1=1.80&r2=1.81&f=h
Pete
|