11 Aug
2016
11 Aug
'16
12:06 p.m.
On Thursday 11 August 2016 15:44:24 Doug wrote:
On 08/11/2016 12:50 PM, Gene Heskett wrote:
Neither do I Doug, sorry. See the announcement on /. today & read the
link to the post from the guys that found it that is in the story,
UCsomething IIRC, see below. A closer read may answer it.
<https://ucrtoday.ucr.edu/39030>
And please keep things like this on the list you read it from. A PM is
unfair to the other readers of the list you read it on, so I'll cc the
three lists it was cross posted to as it sounds pretty serious to me.
And I just noted that the sysctl command you quoted above is incorrect,
its sysctl -p, not sysctl.p.
Maybe that helps?
Cheers, Gene Heskett
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page <http://geneslinuxbox.net:6309/gene>
On Thursday 11 August 2016 12:47:09 Nicolas
George wrote:
CC:ing emc-developers, and trinity-users who may not yet be aware of
this tcp attack vector thats quite dangerous. And my post to
trinity-users was in error, so this corrects it.
Running PCLOS. I put in the original command with dots. When I run
sysctl.p from a root environment I get no response, but no error
either. Don't know the significance of that.
--doug Le quintidi 25 thermidor, an CCXXIV, Gene Heskett
a écrit :
I changed it back Nicolas, and sysctl -p now returns:
root@coyote:/etc/init.d# sysctl -p
sysctl: cannot stat /proc/sys//net.ipv4.tcp_challenge_ack_limit: No
such file or directory
Put the slashes back and I get this:
root@coyote:/etc/init.d# sysctl -p
.net.ipv4.tcp_challenge_ack_limit = 999999999
Which I assume is the correct response. And yet the echo shows all
dots.
WTH? Ahh, my bad, no damned biscuit, an extra leading slash snuck
in. But if a dot and a slash are the same to sysctl, I should have a
file in the wrong place? But I do not. /net is empty. It is in the
right place now. And cats the correct value.
Sorry about the confusion everybody.
Cheers, Gene Heskett to add should be changed to forward slashes:
You are wrong, sysctl supports both slashes and dots as separators.
Regards, 
11 Aug
11 Aug
1:36 p.m.
New subject: (OT kinda) Newly-discovered TCP flaw
On Thu, 11 Aug 2016, Gene Heskett wrote:
And I just noted that the sysctl command you quoted
above is incorrect,
its sysctl -p, not sysctl.p.
as I indicated yesterday in my 'work-around' posts, the line I got
which works is:
net.ipv4.tcp_challenge_ack_limit = 99999999
haven't tried it with slashes.
the re-load is
sysctl -p
E. Liddell says it is addressed in kernel 4.7; I'm on an old kernel
and may fool around with updating it sometime when I have nothing more
fun to do.
f.
--
Felmon Davis
What is food to one, is to others bitter poison.
-- Titus Lucretius Carus
4:18 p.m.
New subject: [trinity-users] Re: (OT kinda) Newly-discovered TCP flaw
On Thu, 11 Aug 2016 16:36:19 -0400 (EDT)
Felmon Davis <davisf(a)union.edu> wrote:
E. Liddell says it is addressed in kernel 4.7; I'm
on an old kernel
and may fool around with updating it sometime when I have nothing more
fun to do.
That's what I got by drilling down to the actual advisory (it also linked the
specific git commit, although I didn't check that link). Keep in mind
that 4.7 is *very* recent--the merge window for its successor, 4.8, just
closed yesterday. I don't know if the patch was backported to the
various long-term support kernel series like 4.1.
Significantly older kernels should also be in the clear, but I got contradictory
indications about exactly when the problem code was added--possibly
version 3.6.
E. Liddell
2838
days inactive
2838
days old
2 comments
3 participants
participants (3)
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E. Liddell -
Felmon Davis -
Gene Heskett