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Firefox and IE together brew up security trouble

noroom   on 11 July 2007 - 17:02 · 64 comments & 29778 views

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Users could face a "highly critical" risk if they have both IE and Firefox version 2.0, or later, loaded on their computer. The trouble begins when browsing a malicious site while using IE and it registers a "firefoxurl://" URI (uniform resource identifier) handler, which allows the browser to interact with specific resources on the Web. As a result, users may find their systems remotely compromised.

Earlier Tuesday, security researcher Thor Larholm, who discovered the IE flaw, and security research giant Symantec put much of the blame on IE, while Secunia's Thomas Kristensen, chief technology officer, attributed the problem to Firefox versions 2.0 or later. "It's a little bit of both," said Oliver Friedrichs, director of Symantec's Security Response Center. "You have two very complex applications that are not playing well together and leading to a security issue. The components themselves are secure as stand-alone products but not together."

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News source: News.com

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(3 replies) #1 RyanVM on 11 Jul 2007 - 17:09
FWIW, the Mozilla crew checked in a fix for this bug to their source tree last night and it appears that they're going to be accelerating the release of 2.0.0.5 in order to get this patched ASAP.
#1.1 RyanVM on 11 Jul 2007 - 18:50
To reply to myself, it appears that they're targeting next Thursday for getting a final 2.0.0.5 build pushed out with this fix included.
http://wiki.mozilla.org/Firefox:2.0.0.5
#1.2 yizuman on 16 Jul 2007 - 17:36
Quote - (RyanVM said @ #1)
FWIW, the Mozilla crew checked in a fix for this bug to their source tree last night and it appears that they're going to be accelerating the release of 2.0.0.5 in order to get this patched ASAP.


What ticks me off is that they ANNOUNCE the bug in PUBLIC, thus making hackers aware of the exploit and try to use ASAP before the new patch is issued.

Another thing is that they are being FORCED to accelerate the release of the patch rather making sure that the patch is BUG FREE, if all possible. I rather that the developers do a right job on a patch rather than a hastily done patch that could later result more problems.

/off soap box

#1.3 8-n-1 on 16 Jul 2007 - 21:10
Quote - (yizuman said @ #1.2)
What ticks me off is that they ANNOUNCE the bug in PUBLIC, thus making hackers aware of the exploit and try to use ASAP before the new patch is issued.


So you'd rather that the hackers already know about this and tell each other about it, but that the general public has no idea that they're in danger?
(4 replies) #2 EduardValencia on 11 Jul 2007 - 17:14
Well so if i have IE 7 and firefox 2.0.0.4 Installed,i'm vulnerable?
#2.1 matty13 on 11 Jul 2007 - 17:15
Quote - (EduardValencia said @ #2)
Well so if i have IE 7 and firefox 2.0.0.4 Installed,i'm vulnerable?


Either IE7 or Firefox 2.0+ is vunrable.
#2.2 RyanVM on 11 Jul 2007 - 18:52
As was mentioned further down, for this exploit to work, you have to be browsing the malicious site in IE with Firefox closed at the time. I understand that some people still need to use IE for certain sites, but I'd really hope that doesn't include the types of sites where these exploits are more likely to appear .

For that reason, while I think this exploit is nasty, I think it'll largely end up not being exploited very much.
#2.3 HawkMan on 11 Jul 2007 - 20:36
Or maybe some peopel installed FF, realizd it's crap, and just continued using IE without uninstalling FF.
#2.4 ThaCrip on 12 Jul 2007 - 01:04
Quote - (RyanVM said @ #2.2)
As was mentioned further down, for this exploit to work, you have to be browsing the malicious site in IE with Firefox closed at the time. I understand that some people still need to use IE for certain sites, but I'd really hope that doesn't include the types of sites where these exploits are more likely to appear .

For that reason, while I think this exploit is nasty, I think it'll largely end up not being exploited very much.


i aint worried about this much myself since i almost never use IE besides for windows updates pretty much.

but it's nice to know they going to patch it asap
(9 replies) #3 Fubar on 11 Jul 2007 - 17:20
shame i cant completely remove internet explorer from my comp
#3.1 sCrAtCh420th on 11 Jul 2007 - 17:26
Quote - (Fubar said @ #3)
shame i cant completely remove internet explorer from my comp


i sure did with vista
#3.2 Samboini on 11 Jul 2007 - 17:55
I debated it but on rare occasions I will visit a site that only supports IE, so can't do it
#3.3 kheldorin on 11 Jul 2007 - 18:29
Quote - (Fubar said @ #3)
shame i cant completely remove internet explorer from my comp

What has that got to do with the vulnerability? The exploit happens when you browse using IE and have firefox installed.
#3.4 Cryingcure on 11 Jul 2007 - 18:31
Quote - (sCrAtCh420th said @ #3.1)
Quote - (Fubar said @ #3)
shame i cant completely remove internet explorer from my comp


i sure did with vista


Good for you. You have any idea the security holes you opened up in doing that?

Smooth move
#3.5 HawkMan on 11 Jul 2007 - 20:37
I don't think he does, because removing IE would be removing explorer, wich would leave him without a windows shell... does litestep work on Vista ? :p
#3.6 WDGC on 11 Jul 2007 - 22:15
Quote - (kheldorin said @ #3.3)
Quote - (Fubar said @ #3)
shame i cant completely remove internet explorer from my comp

What has that got to do with the vulnerability? The exploit happens when you browse using IE and have firefox installed.

Well ... if IE has been removed it can hardly be used for browsing, can it?
#3.7 TRC on 12 Jul 2007 - 02:22
Quote - (HawkMan said @ #6)
I don't think he does, because removing IE would be removing explorer, wich would leave him without a windows shell... does litestep work on Vista ? :p


You did know that IE was separated from the Explorer shell in Vista didn't you? I guess not.
#3.8 faraaz on 12 Jul 2007 - 07:26
Quote - (WDGC said @ #3.6)
Quote - (kheldorin said @ #3.3)
Quote - (Fubar said @ #3)
shame i cant completely remove internet explorer from my comp

What has that got to do with the vulnerability? The exploit happens when you browse using IE and have firefox installed.

Well ... if IE has been removed it can hardly be used for browsing, can it?


you dont need IE removed, just dont run it
#3.9 RealFduch on 13 Jul 2007 - 02:38
Quote -
You did know that IE was separated from the Explorer shell in Vista didn't you? I guess not.

But if you really remove IE, you'll lose help, WMP, and many other features.
Completely removing IE is a bad paranoia that damages system.
(2 replies) #4 MioTheGreat on 11 Jul 2007 - 18:00
Under protected mode IE, attempting to do a firefoxurl:// will cause a popup dialog, informing you that it's trying to launch an external program....
#4.1 kheldorin on 11 Jul 2007 - 18:10
And under firefox 2.0.4, you get another confirmation dialog. Not sure about earlier versions.
#4.2 Croquant on 12 Jul 2007 - 19:58
Quote - (kheldorin said @ #4.1)
And under firefox 2.0.4, you get another confirmation dialog. Not sure about earlier versions.

You mean 2.0.0.4, not 2.0.4.
(6 replies) #5 Croquant on 11 Jul 2007 - 18:00
You're only vulnerable if you use IE.
But if you have Firefox installed, why would you ever use IE?
#5.1 vetmarkjensen on 11 Jul 2007 - 18:07
Quote - (Croquant said @ #5)
You're only vulnerable if you use IE.
But if you have Firefox installed, why would you ever use IE?
There are some sites that require it. To access corporate web-email in my company, IE is required because of an ActiveX plug-in.
#5.2 Cryingcure on 11 Jul 2007 - 18:31
Quote - (Croquant said @ #5)
You're only vulnerable if you use IE.
But if you have Firefox installed, why would you ever use IE?


Because not all of us are fanboys of Firefox
#5.3 ThaCrip on 12 Jul 2007 - 01:07
Quote - (Cryingcure said @ #5.2)
Quote - (Croquant said @ #5)
You're only vulnerable if you use IE.
But if you have Firefox installed, why would you ever use IE?


Because not all of us are fanboys of Firefox


i aint a fanboy and i agree with him as why would you use IE if u got firefox installed in the first place since odds are if u got firefox installed you want to use it.

p.s. i understand though that theres times where IE is required... but in most cases it is not, especially for the average joe.
#5.4 Night.Hawk on 12 Jul 2007 - 01:31
Quote - (Croquant said @ #5)
You're only vulnerable if you use IE.
But if you have Firefox installed, why would you ever use IE?


Web developers and designers. They can't just assume that what works in one browser works in another.
#5.5 Anshrew on 13 Jul 2007 - 01:22
Quote - (markjensen said @ #5.1)
Quote - (Croquant said @ #5)
You're only vulnerable if you use IE.
But if you have Firefox installed, why would you ever use IE?
There are some sites that require it. To access corporate web-email in my company, IE is required because of an ActiveX plug-in.

firefox has an extension that lets you open a tab in IE format. lets you view those sites fine.
IE = Useless for the average person.
#5.6 RealFduch on 13 Jul 2007 - 02:39
Quote -
IE = Useless for the average person.

How long have you been living in that cave?
(1 reply) #6 duntkno on 11 Jul 2007 - 18:20
same here, some websites just dont work well with firefox. Couldnt remove explorer.exe even if i wanted to.
#6.1 RealFduch on 13 Jul 2007 - 02:40
another "camputir ikzpert"
#7 justlooking on 11 Jul 2007 - 18:35
NoScript seems to have that covered.

v 1.1.4.9.070622
=====================================================================
+ Full anti-XSS protection for every trusted URL opened from external
applications
+ Protection against all the currently known cross-browser exploits
targeting Firefox (Larholm, Rios, MacManus...)
(4 replies) #8 Lt-DavidW on 11 Jul 2007 - 18:49
Guess I'd better uninstall Internet Explorer then. Oh wait...
#8.1 toadeater on 11 Jul 2007 - 20:53
Quote - (Lt-DavidW said @ #
Guess I'd better uninstall Internet Explorer then. Oh wait...


IE should be classified as malware.
#8.2 MioTheGreat on 11 Jul 2007 - 21:51
Quote - (toadeater said @ #8.1)
Quote - (Lt-DavidW said @ #
Guess I'd better uninstall Internet Explorer then. Oh wait...


IE should be classified as malware.


Why? IE7 is quite usable. Besides. This is a FF problem.
#8.3 RealFduch on 13 Jul 2007 - 02:42
Quote -
Guess I'd better uninstall Internet Explorer then. Oh wait... I'm dumb! I don't know how to uninstall Windows features!! Oh wait. I don't know how to use my competer!!! HELP MEEEE!!!

FIXED FOR TEH TRUTH!
#8.4 +Octol on 14 Jul 2007 - 20:27
Quote - (toadeater said @ #8.1)
IE should be classified as malware.
Hey, toadeater! Haven't seen one of your posts for a while!

You should post more; this place is just too boring without you!
(4 replies) #9 SHADOW-XIII on 11 Jul 2007 - 18:54
so it began ... still not changing to safest and fastest browser ?
Opera ...
#9.1 +Berserk87 on 11 Jul 2007 - 19:14
GTFO

most people dont use opera for more reasons then that.
and why would i have FF installed and browse with IE? chances are you dont....unless you need to use IE for a windows site or another 'safe' site.
#9.2 Eis on 12 Jul 2007 - 14:42
Quote - (Berserk87 said @ #9.1)
GTFO


Yeah, that's mature. Way to handle your emotions when someone even mentions a browser that doesn't happen to rhyme with Firefox. Deal with someon else's opinion, or convince them to see your light. Don't be a troll.
Quote - (Berserk87 said @ #9.1)
most people dont use opera for more reasons then that.


Really? Well that was specific. And on that subject, more reasons than what? The other guy never gave anybody a reason not to use Opera, he simply stated that Opera was the fastest and safest web browser. Which is completely true. Deal with it.

Quote - (Berserk87 said @ #9.1)
and why would i have FF installed and browse with IE? chances are you dont....unless you need to use IE for a windows site or another 'safe' site.


Uh, so what you're saying is...nothing. There's IE only pages, so that's why you would use it. Why would you ask a stupid question that you can obviously answer yourself within 2 seconds?
#9.3 ichi on 12 Jul 2007 - 15:19
Quote - (Eis said @ #9.2)
he simply stated that Opera was the fastest and safest web browser.


Faster than links2?
#9.4 Eis on 12 Jul 2007 - 16:26
Quote - (ichi said @ #9.3)
Quote - (Eis said @ #9.2)
he simply stated that Opera was the fastest and safest web browser.


Faster than links2?


You got me there.
#10 soldier1st on 11 Jul 2007 - 19:09
if you use hitman pro it will put the browsers into a lower rights mode so if something like this happens you are safe,also under firefox if you use the no script extension you get extra protection and if you use firefox then run the ietab extension so you can run ie in firefox for those certain sites=safety.as long as you keep up with security your fine and watch what you do these things will never get you.all get hitman pro and protect urselves.
#11 OblivionStalker on 11 Jul 2007 - 20:18
You can open every site with Firefox. Use the IEtab (or something like that) extension for firefox. ActiveX may not work, but I think there was an extension to bypass it or something.
#12 sCrAtCh420th on 11 Jul 2007 - 20:44
you dont need ie just keep the html engine this is if your running vista
(8 replies) #13 borkenek on 11 Jul 2007 - 22:59
There is a patch on a Turkish website called ShiftDelete.Net. It removes the handler.

http://www.shiftdelete.net/site/download/s...irefox_yama.zip

The button on the left removes the handler and the one on the right undoes the action.
BTW Opera is proven to be the safest browser once again.
#13.1 internetworld7 on 11 Jul 2007 - 23:27
Quote - (borkenek said @ #13)
There is a patch on a Turkish website called ShiftDelete.Net. It removes the handler.

http://www.shiftdelete.net/site/download/s...irefox_yama.zip

The button on the left removes the handler and the one on the right undoes the action.
BTW Opera is proven to be the safest browser once again.


A patch from a site frequented by Al-Qaeda? No thanks but I agree with you concerning Opera.
#13.2 borkenek on 11 Jul 2007 - 23:48
Quote - (internetworld7 said @ #13.1)
Quote - (borkenek said @ #13)
There is a patch on a Turkish website called ShiftDelete.Net. It removes the handler.

http://www.shiftdelete.net/site/download/s...irefox_yama.zip

The button on the left removes the handler and the one on the right undoes the action.
BTW Opera is proven to be the safest browser once again.


A patch from a site frequented by Al-Qaeda? No thanks but I agree with you concerning Opera.


Do you think that a website hosting this gallery has something to do with Al-Qaeda? You have so much wrong thoughts about my country. I know that the patch does not harm the system. Here is the VirusTotal scan result..

Last edited by borkenek on 12 Jul 2007 - 00:11
#13.3 4tehlulz on 12 Jul 2007 - 00:10
Quote - (internetworld7 said @ #13.1)
Quote - (borkenek said @ #13)
There is a patch on a Turkish website called ShiftDelete.Net. It removes the handler.

http://www.shiftdelete.net/site/download/s...irefox_yama.zip

The button on the left removes the handler and the one on the right undoes the action.
BTW Opera is proven to be the safest browser once again.


A patch from a site frequented by Al-Qaeda? No thanks but I agree with you concerning Opera.


lol racism
#13.4 RyanVM on 12 Jul 2007 - 00:51
Quote - (4tehlulz said @ #13.3)
lol racism
Are you serious? People who don't support Al Qaeda are racists? I suppose that's one way of looking at things. Or they might, I don't know, disapprove of a group of people whose sole purpose is to destroy their way of life and impose theirs upon them.

Honestly, of all the things you could have said, you chose RACISM?
#13.5 borkenek on 12 Jul 2007 - 01:03
Quote - (RyanVM said @ #13.4)
Quote - (4tehlulz said @ #13.3)
lol racism
Are you serious? People who don't support Al Qaeda are racists? I suppose that's one way of looking at things. Or they might, I don't know, disapprove of a group of people whose sole purpose is to destroy their way of life and impose theirs upon them.

Honestly, of all the things you could have said, you chose RACISM?


Obviously, you didn't get the point. I think what he calls racism is labelling all the nation as Al Qaeda supporters.
#13.6 4tehlulz on 12 Jul 2007 - 15:21
Quote - (borkenek said @ #13.5)
Obviously, you didn't get the point. I think what he calls racism is labelling all the nation as Al Qaeda supporters.


+1 for reading comprehension.
#13.7 RAID 0 on 13 Jul 2007 - 18:04
Quote - (4tehlulz said @ #13.6)
Quote - (borkenek said @ #13.5)
Obviously, you didn't get the point. I think what he calls racism is labelling all the nation as Al Qaeda supporters.


+1 for reading comprehension.


Labelling a group is called stereotyping. Racism is when you think one race (usually your own) is better than others.
Yes no?
#13.8 +Octol on 14 Jul 2007 - 20:38
[Edited]

Last edited by Octol on 15 Jul 2007 - 12:47
#14 warr on 12 Jul 2007 - 01:16
so Al Qaeda becomes a race now. I learnt something new today.
#15 derwisch on 12 Jul 2007 - 01:24
We are getting off the topic, let's stop talking on silly Al Qaeda thing, shall we?

I think Thursday is too late for patching the vulnerability so I put that link here.
There's also an English version: http://gghaberver.googlepages.com/sdn-ffpatch.rar
It requires .NET Framework 2.0.
(3 replies) #16 LTD on 12 Jul 2007 - 02:40
Safari FTW.
#16.1 C_Guy on 12 Jul 2007 - 15:00
I didn't know "FTW" means "crash on Windows and Mac".

At least when Microsoft ported over Internet Explorer to the "other side" it actually worked.

But look at the bright side: If you think Safari is alright when you switch to FireFox you will experience the web on a whole other level.
#16.2 azcodemonkey on 12 Jul 2007 - 17:02
Quote - (C_Guy said @ #16.1)
I didn't know "FTW" means "crash on Windows and Mac".

At least when Microsoft ported over Internet Explorer to the "other side" it actually worked.

But look at the bright side: If you think Safari is alright when you switch to FireFox you will experience the web on a whole other level.


In this case, FTW means Fails to work.
#16.3 RealFduch on 13 Jul 2007 - 02:43
Quote - (C_Guy said @ #16.1)
I didn't know "FTW" means "crash on Windows and Mac".

You are lucky if it just crashes. It has so many security holes that if it didn't crash, you PC would be infected in a fraction of second.
#17 Budious on 12 Jul 2007 - 04:34
Well if I installed Firefox 2.0 on my computer, it was to use it as my primary browser, so I wouldn't worry about using IE anytime soon to access Firefox resources. The only time IE gets use is with Windows Update.
#18 warr on 12 Jul 2007 - 07:36
and u don't even have to use it for windows update.
u got Autopatcher. or u can allow windows update to download from the background.
(1 reply) #19 Azmodan on 14 Jul 2007 - 16:26
So unfortunately we have a clash here of Opera, Internet Explorer, Firefox and the rare seen Safari fans.

You guys need to understand the causes of the problem, which is, WINDOWS. You see, Internet Explorer has the URI Handler activated because Internet Explorer IS the Windows Explorer shell.

Now, before pointing fingers to anyone, Firefox HAS NO RESPONSIBILITY over a WINDOWS flaw that they didn't knew about.

Firefox and Opera are GOOD web browsers. The problem, with Internet Explorer, is that by the time it was made, it was an premature piece of software released to have more features than bug fixes, which isn't the case related to Opera or Firefox issues (read: THE BUGFIX IS GOING TO GET RELEASED NEXT WEEK). I DARE YOU to point when INTERNET EXPLORER had this kind of SUPPORT.

Recently, now that Firefox (and Opera) were taking over the Web Browser's market share, Internet Explorer has become active again, releasing a "nicer" GUI for their browser (the tabs, animations, and everything's nice) but it still isn't compliant with PNG transparencies, not even CSS1!

If you people have a true sense of logic, grab these browsers: Opera, Firefox and (sadly, included in your Windows system) Internet Explorer, and THEN compare them.

People in my company migrated their ActiveX system to a faster and more secure AJAX interface, because they knew about Internet Explorer flaws.

Now, bring on the trolls and flames, I know this place is popular because of the eternal FUD and (most of the) statements that only could brew a 10-yo child.

Thanks for your time
#19.1 Kyanar on 16 Jul 2007 - 03:31
Quote - (Azmodan said @ #19)
So unfortunately we have a clash here of Opera, Internet Explorer, Firefox and the rare seen Safari fans.

You guys need to understand the causes of the problem, which is, WINDOWS. You see, Internet Explorer has the URI Handler activated because Internet Explorer IS the Windows Explorer shell.

Now, before pointing fingers to anyone, Firefox HAS NO RESPONSIBILITY over a WINDOWS flaw that they didn't knew about.


Been drinking? This is a flaw in FIREFOX ALONE. Firefox should properly parse it's command line arguments, or register an association that DOESN'T allow arbitrary parameters to be submitted (i.e. use DDE like you're meant to).

Allow me to rephrase what you said:

Quote -
You guys need to understand the causes of the problem, which is, FIREFOX. You see, Internet Explorer has the URI Handler activated because Internet Explorer IS the Windows Explorer shell. [[I tried to reverse this, but it didn't make sense to start with]]

Now, before pointing fingers to anyone, Firefox HAS ALL RESPONSIBILITY over a FIREFOX flaw that they didn't knew about.

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