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Big Day For Browser Vulnerabilities
An anonymous reader writes "All browsers have been reported vulnerable to different vulnerabilities today. Starting with: Internet Explorer on XP SP1/SP2, which suffers a new system compromise (of course) vulnerability. Continuing with: Opera, Mozilla / Mozilla Firefox / Camino, Safari, Netscape, Konqueror, Avant Browser and Maxthon, which all suffers some new spoofing vulnerabilitities. Demonstrations of the spoofing vulnerabilities are available here and here."
Stop the presses.
sarchasm: The gulf between the author of sarcastic wit and the person who doesn't get it.
Possibly solutions that I've just thought up (for discussion)
While they're fixing this, if all browser makers could make sure there's an option to stop websites resizing my browser, that'd be lovely. I know Moz has this, so it can't be hard for everyone to have it.
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it's just that IE is so tied to the OS that when it goes down so does the whole 'puter
-Nb
whois gawk date unzip strip find touch finger mount join nice man top fsck grep eject more yes exit umount sleep dump
Lynx missed out!
Be you Admins? nay, we are but lusers!
The advisories list the IE problems as much highly critical, whereas the others are only medium critical.
As I understand it, problem with IE vulns are that its SO tied to the OS, that even the most trivial of problems can cause much greater problems.
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I use Lynx, you insensitive clod!
CDJChristian Jones
Medicine. Mathematics. Mediocrity.
Wanna guess how long Mozilla, Firefox and such will take to fix this?
:)
And how long IE will take?
Didn't think so.
The Tlog - a technology blog
I guess the best defense is a good slashdotting.
I just tried the exploit demonstration for Safari, but it did not work. The active tab switched back to the one providing the pop-up, not the target site. Did anyone else try it and have it work?
Slashdotted already. Would it kill the editors to, you know, edit and provide brief outlines of the stories they're linking to, especially in the case of stories on third party sites that they know will most likely not stand a slashdotting?
"Accept that some days you are the pigeon, and some days you are the statue." - David Brent, Wernham Hogg
For those who can't be bothered to RTFA, the Mozilla vulnerability is essentially a standard link with an "onMouseOver" bit which runs a little piece of JavaScript.
The JavaScript pauses for a few seconds (while you presumably get distracted by another page) then flashes up a "Please enter some text" dialogue box.
A similar effect could be achieved by calling the JavaScript on pretty much any event; the vulnerability relies on it being unclear which site caused the dialogue box to pop up. I can see how it could be classed a vulnerability, but it's hardly earth shattering.
For Apple's Safari browser
g _box_sp oofing_test/
Description:
Secunia Research has discovered a vulnerability in Safari, which can be exploited by malicious web sites to spoof dialog boxes.
Inactive windows can launch dialog boxes so they appear to be displayed by a web site in another window. This can be exploited by a malicious web site to show a dialog box, which seems to originate from a trusted web site.
Successful exploitation would normally require that a user is tricked into opening a link from a malicious web site to a trusted web site in a new window.
A test is available here:
http://secunia.com/multiple_browsers_dialo
The vulnerability has been confirmed in Safari 1.2.3 (v125.9). Other versions may also be affected.
Solution:
Don't visit trusted web sites while visiting untrusted web sites or disable JavaScript.
And for IE
Description:
http-equiv has discovered two vulnerabilities in Internet Explorer, which can be exploited by malicious people to compromise a user's system, link to local resources, and bypass a security feature in Microsoft Windows XP SP2.
1) Insufficient validation of drag and drop events from the "Internet" zone to local resources for valid images or media files with embedded HTML code. This can be exploited by e.g. a malicious web site to plant arbitrary HTML documents on a user's system, which may allow execution of arbitrary script code in the "Local Computer" zone.
This vulnerability is related to:
SA12321
NOTE: Microsoft Windows XP SP2 does not allow Active Scripting in the "Local Computer" zone.
2) A security zone restriction error, where an embedded HTML Help control on e.g. a malicious web site references a specially crafted index (.hhk) file, can execute local HTML documents.
NOTE: This will also bypass the "Local Computer" zone lockdown security feature in SP2.
The two vulnerabilities in combination with an inappropriate behaviour where the ActiveX Data Object (ADO) model can write arbitrary files can be exploited to compromise a user's system. This has been confirmed on a fully patched system with Internet Explorer 6.0 and Microsoft Windows XP SP2.
Solution:
Disable Active Scripting or use another product.
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That's ridiculous. It has nothing to do with tabs. The same thing would happen with multiple open windows. To come to the conclusion that "tabs are problematic" is asinine.
Essentially, it's an interface error. The problem seems to be that dialog boxes don't explain which tab they belong to.
/.'ed, but I wouldn't be surprised if it works just as well for opening the external site in a new window.
So with some creative coding, properly guessed/estimated delays, you can create the impression that dialog box A belongs to tab X, while it's actually from tab Y.
I'm not sure if it's restricted to tabs. Can't get to the demo sites anymore as they're
Assorted stuff I do sometimes: Lemuria.org
As I can't link bugzilla form Slashdot... go to http://bugzilla.mozilla.org/ and type in there the bug number. (None: it's not marked there as FIXED, but you should look at the "fixed-aviary1.0" keyword, which is what matters for Firefox 1.0)
> Re:firefox users update now!
Why?
As far as I can see, there are no updates for this problem.
Am I missing something?
Because the complexity and importance of our web browsers continues to increase, security of those applications will never be "solved" or "fixed".
Other steps must be taken to deal with these issues. What we can do is treat the symptoms.
For those using Linux or UNIX, privilege separation (running the browser process as a user ID that has limited rights) and a chroot jail would be major steps forward.
I believe the browser projects need to work with the community to support that type of runtime configuration.. Before a big nasty vulnerability does damage.
Chroot, in particular, is very tricky.
This is an excellent example of two facts:
Here's what the vulnerabilities are:
In all the non-IE browsers, there's a potential issue with how tabbed browsing works. Basically, the problem is that stuff on tabs other than the active tab can still (a) pop dialogs and (b) have the keyboard focus. It's pretty clear that (b) is just a problem that should be fixed, because although it's possible to concieve of a circumstance where a user would want to look at one tab while typing into a box on another, it's clearly way too surprising and not nearly useful enough to be allowed. But (a) is more interesting. It's a side effect of the fact that pages continue functioning in all ways even when they're not the active tab. This includes running Javascript/Java/Flash programs, loading, rendering, etc. And that's a good and useful thing. But when a background tab pops a dialog, it may appear to the user that the dialog was created by the active page. If the user trusts one page more than the other, that can lead to problems.
The solution to this dialog-popping problem isn't obvious. Perhaps dialogs need to be labeled with the name of the site that created them. Perhaps some other solution. But it will be worked on, even though the risk is fairly small.
The IE vulnerability is very different in that it's a system compromise flaw. It's similar in one way, though: it's caused by a subtle interaction of features. In this case, dragging and dropping of image or media files with embedded HTML code, which may be malicious. This malicious code isn't a problem, really, because IE is security-conscious and won't execute it -- except that Microsoft has that terrible "security zones" design feature. Once the malicious code is moved from the "Internet" zone to the "Local Computer" zone, the code will be executed. What makes it especially funny is that Microsoft fixed this problem in SP2 by changing the Local Computer zone so tht it will no longer execute Active Scripts. But yet another bug in the security zones can be exploited to bypass that "problem" so SP2 is vulnerable as well.
Security flaws are everywhere, but what really kills Microsoft is their rash of bad design decisions in the past, turning little holes into remote root exploits. They're getting better, I believe, but it's going to be a long hard road for them to patch all of the problems that are created by their bad design decisions. It's too late, of course, to change the design. Too much depends on it.
Once again, for all you web masters out there who cannot code a simple <a href="foo"> without using Javascript:
SOME OF US RUN WITH JAVASCRIPT DISABLED BY DEFAULT, FOR GOOD REASON!
Yes, there are plenty of places where you CANNOT do what you need to do without Javascript - in those cases go ahead and use Javascript.
But for a simple link to another page, or to an image, or to simply DISPLAY you site's content (I'm thinking of bone-headed sites like the International Herald Tribune here who use JS to display otherwise hidden text for their stories), USE HTML DAMNIT! OK, if you want to "enhance" (pronounced "clutter up with needless crap") you site by overriding those behaviors IF Javascript is enabled, knock yourselves out (preferably with a large mallet). BUT MAKE STANDARD HTML WORK AS WELL!
Yes, you may WANT your image to be in its own window, without the standard decorations a browser will add. But if I have JS disabled, make the damn link just spawn a new window and be done with it.
www.eFax.com are spammers
The Mozilla etc problem seems equally serious.
Mozilla etc... "If the user explicitly opens a page in a background tab, it may not be possible to tell what webpage a dialog box is associated with". Note that the exploit can not open a page in a background tab, it can only take advantage of that if it happens.
Exposure: If the user can first be tricked into opening a page in another tab, and the exploiter can guess whether the user has "open tabs in background" (or the equivalent option) selected or not, then they may be able to trick them into entering confidential information a little easier. There are other ways to get similar results without having to trick the user twice, using frames or with multi-stage popups.
Internet explorer: The exploit can be used to launch web pages in the local security zone. The hole here is really the fact that there is such a thing as a "local security zone" at all. For seven years now, exploit after exploit has used this design flaw in the HTML control to run arbitary code as the local user. Spyware, viruses, worms, spam bots, over and over again, malicious software has gained its initial foothold through variants of this attack.
Exposure: Visiting a web page can allow an attacker to take over your computer, without any further action on your part.
And you say "The Mozilla etc problem seems equally serious."?
Jesus.
Demonstrations of vulnerabilities: here and here
The dig is just desserts. IE sitll can't rid itself of backdoor connections to the OS that do not plague other browsers. These came about in part because of Microsoft naivete [as its programming culture arose in the protected world of standalone office products] and partly from its attempt to defend against DOJ litigation [ aimed at its monopolistic moves to kill Netscape] by claiming that "browsers are naturally part of the OS". Serves 'em right!
SLASHDOT: news for people who can't concentrate on work or have no life at all and got tired of yelling back at the TV.
I left Javascript enabled in Konqueror, but set "open new windows" to "ask" in preferences and set the other JS policies to "ignore." Site displayed normally, and the spoofed text entry box didn't launch.
This is my post. There are many others like it. If you don't like what you read here, go try one of the others.
The Last Measure link contains stuff you really don't want to be seeing. Don't click on it if you're just looking for a demo of the popup style.
"I would give my right hand to be ambidextrous."
The window from an unactive tab coming to the front in Firefox does not really seem like that big of a deal. I kind of like the fact that it does this. At work, the server needs to resart to load a new java war file so I usually browse on other tabs while the server is restarting. when it starts, the notification window pops to the top. Perhaps there should be an option to turn this on or off (the option could default to off)...I don't really see that many people putting really important information into a javascript notification window anyway.
SIGFAULT