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 8/26/2008 4:13 PM
User is offline Kevin J Baird
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Ubuntu issues security patch for kernel flaw
 

Ubuntu on Tuesday became the latest Linux vendor to patch a vulnerability in the open-source operating system's kernel that could have left the door open for hackers to find their way into users' machines.

In an e-mail sent overnight, the Linux vendor warned users to update all machines running recent versions of Ubuntu, ranging from 6.06, which was released back in mid-2006, to version 8.04, which came out earlier this year. The problem also applied to other versions of Ubuntu such as Kubuntu, Edubuntu, and Xubuntu.

"It was discovered that there were multiple NULL-pointed function de-references in the Linux kernel terminal handling code," wrote Ubuntu administrators in the e-mail. "A local attacker could exploit this to execute arbitrary code as root, or crash the system, leading to a denial of service."

The e-mail also detailed a number of other bugs that could be exploited by an attacker who already had some level of access to a computer running Ubuntu.

A number of other Linux vendors including Novell have recently released similar patches to address the problems.

 
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 8/26/2008 5:06 PM
User is offline kpilkington
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Re: Ubuntu issues security patch for kernel flaw
 
bleh, another local-access vuln. this is solved with the classic Rule #0 for security.

gamercard
 
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 8/26/2008 5:19 PM
User is offline Kevin J Baird
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Re: Ubuntu issues security patch for kernel flaw
 
It's just like the Vista vulnerability.  You need a vulnerability to get in and commit the exploit.  And just like Vista, you only need to make a small change to render it unworkable. 

Of course, with Vista, people freak out and sing from the high hills, and with Linux, people ignore it.  Although, I've had my linux server hacked numerous times.  That's why this website doesn't run on it anymore.


 
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 8/26/2008 7:21 PM
User is offline kpilkington
362 posts
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Re: Ubuntu issues security patch for kernel flaw
 
Modified By kpilkington  on 8/26/2008 6:27:41 PM
well this is different than the vista attack from BH08. the end result will be the same but the vista one bypasses the new security features that were introduced in vista and xp sp2. this one either requires an attack remotely or local physical access which rule #0 "never lose physical access" should be covering at all times.

if you've got any computer that is shared. why would you share it with strangers or people you don't trust? if you HAVE to share it with the baddies then you have to know how to mitigate the risk of it being owned with a simple USB-key being inserted or a keylogger placed on the back of the machine or even one placed INSIDE the keyboard with a wireless AM radio transmitter to broadcast the keys to a nearby receiver. maybe remote attacks aren't a lot harder still, but physical ones are point-and-click no matter what OS or security you've got running. i'm sure we can all agree on that fact.



anyways my views on linux security vary from distro to distro, package to package and so on. debian isn't very good with security as we can see here. i'm not surprised they let that one slip by. they focus mainly on the user experience with ubuntu and are under lots of pressure to create more and more desktop apps. slackware, gentoo and BSD are high up there for me though. we're running several openBSD servers right now and have never had a problem with them. freebsd for all the workstations (has XP and Fedora too). i use slackware to hack, bsd in the mac, gentoo is good for when i'm trying to make my own systems for CD/USB/VM. have you ever used gentoo before kevin? its a lot easier to install these days.

gamercard
 
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 8/26/2008 9:58 PM
User is offline Kevin J Baird
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Re: Ubuntu issues security patch for kernel flaw
 
No, I kinda gave up on Linux.  I have Ubuntu in a VMWare session if I ever want to tinker with it, but after spending significant time with Linux, I've come around to the thought that it's still not ready for the desktop market, and is largely just a server or dedicated device OS.  I don't think that'll change either. 

And Vista error is the same as the Linux error.  You need to get access in both cases to the machine through an open vulnerability and then you can escalate your access.  The Vista security system isn't compromised at all.  If you read the literature on the BH hack, the problem is backwards compatability.  You can fix it by changing one registry setting, or turning on DEP, or a couple other things they outline in the article.  You just have to change 1 default and the escalation hack is broken. 

Anyway, you should read the technical paper they released on it.  After you do, you'll realize it was a lot of smoke and mirrors over nothing.  The Linux hack would be easier to carry out.
 
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 8/27/2008 5:12 PM
User is offline kpilkington
362 posts
Staff Sergeant


Re: Ubuntu issues security patch for kernel flaw
 
you're actually right. i did read that one, but i was getting it mixed up with another one that i haven't read yet: Attacking the vista heap
Attacking the Vista Heap
and
How To Impress Girls With Browser Memory Protection Bypasses

the first is a new attack vector where you chain heaps together and fill the space until you can control the structure. in his words, you can potentially overflow anything.

another problem is that the 2nd presentation changed titles after the conference.

there was another vector for vista brought up by a korean guy at the conference. developers are bypassing vista's security by using low-priv folders when updating the application/components so it doesn't annoy the user with popups. unfortunately you can just use this as a priv-escalation attack and even modify XP exploit code to work on vista through this.



it'll always be like this until developers write better code that stays within the lines or MS does a top to bottom rewrite. i'm being serious here: why not go the apple route. take a BSD distro and remould it. you get security, speed, stability, documented and fairly-clean code all at once. POSIX and X11 are nice bonuses. MS has got 90,000 employees I'm sure they can write a nice looking windows system from scratch, produce some stable drivers and with MS's influence they can force hardware manufacturers to change again. I actually see no downside to MS doing this. Oh wait, they hate open source lol.


ubuntu is gay. i was really pissed after they (well, debian) fucked up with the random number generation thing. it meant that anyone who generated keys, certs, passwords, etc had to revoke, patch and reissue everything because they were predictable. it was a big deal for people who use Tor. i agree that ubuntu will never break strong into the desktop world. gOS might... but ubuntu will probably stagnate after 9.04/9.10 unless someone starts to dump millions more on it. the problem is most likely commercial support. mac users aren't as many as windows but they're desktop users at least and that means lots of money to spend on software packages. sad too, i really thought ubuntu would break the trend for a while there.

gamercard
 
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 8/27/2008 10:21 PM
User is offline ender
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Re: Ubuntu issues security patch for kernel flaw
 
Its been a rough week for linux 

Hackers Crack into Red Hat

Red Hat confirmed Friday that hackers compromised infrastructure servers belonging
to the company and the Fedora Project, including systems used to sign Fedora packages.


I used Ubunto for a year for everything. i had to hang it up when i got a zune. Pissed me off but
 i used the zune like crazy
 
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 8/28/2008 2:22 PM
User is offline kpilkington
362 posts
Staff Sergeant


Re: Ubuntu issues security patch for kernel flaw
 
yeah they had to revoke all their keys :)

gamercard
 
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Soap Box

Kevin J Baird At:3:51 PM

Well if you like the Rangers, their AHL team "The Hartford Wolf Pack" crushed the Monsters yesterday.

Master_H At:2:40 PM

Go Rangers

Lard At:10:49 PM

Only by one point - and Ottawa has more losses. They're doing worse than the Maple Leafs! That's shameful!

Kevin J Baird At:10:45 PM

Ottawa is doing better than Colorado though, so don't feel too bad.

Lard At:10:32 PM

I'm embarassed to be an Ottawa fan. They are sucking hard.

Kevin J Baird At:10:31 PM

Well cool, but I can't think of a hockey question right now either.

Lard At:10:29 PM

I watch hockey! NFL sucks balls!

Jedihillis At:10:26 PM

I can't wait to hear this episode. Sounds pretty funny.

Lard At:10:22 PM

Lots of highlights from this show for next year!