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Microsoft Patches Remote Code Execution Hole for Internet Explorer

mask.of.sanity writes: Microsoft has released an out-of-band patch for Internet Explorer versions seven to 11 that closes a dangerous remote code execution flaw allowing attackers to commandeer machines. From their advisory: "An attacker who successfully exploited this vulnerability could gain the same user rights as the current user. If the current user is logged on with administrative user rights, an attacker who successfully exploited this vulnerability could take complete control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. Systems where Internet Explorer is used frequently, such as workstations or terminal servers, are at the most risk from this vulnerability." The attack could assist in watering hole and malvertising campaigns. The Windows 10 Edge browser is not impacted.

31 of 56 comments (clear)

  1. Re:Really by Anonymous Coward · · Score: 3, Funny

    Wait, so IE6 isn't affected???

  2. Re:Really by hcs_$reboot · · Score: 2, Insightful

    This bug has been around since IE 7? Wow, this just confirms that MS will only patch bugs once others find them and then they have to work on fixing them.

    Most IEs, even the recent ones, suffer from this bug. MS revealing these long standing issues affecting IE... isn't it a good way to promote Edge, the new MS browser not affected by this bug?

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    Slashdot, fix the reply notifications... You won't get away with it...
  3. Re:Really by Anonymous Coward · · Score: 1

    isn't it a good way to promote Edge, the new MS browser not affected by this bug?

    It certainly is. The update also probably goes ahead and downloads Edge for you, since they know you obviously need it. And since Edge only runs on Win10, the update probably downloads that for you, too. All part of the new Microsoft: patting you on the head and tucking you in at night.

  4. Re:No IE 6??? by timrod · · Score: 2

    Some companies simply can't migrate away from old software because of the nature of their business. I worked for a place that used a copy of JD Edwards (a godawful inventory management system from the 90s that was nearly sued into oblivion because of how buggy it was) that had last been patched in 1998, simply because they would have had to get authorization from the government to upgrade and that would have cost the company a bunch of money.

  5. Re:No IE 6??? by viperidaenz · · Score: 1

    You shouldn't be running XP, It and IE6 are no longer supported, haven't been for well over a year now.

  6. Yeah Well by Greyfox · · Score: 1, Troll
    Fortunately they'll be rid of it soon! Everyone will move to Windows 10 and their shiny new Edge browser, which I'm sure was created as a completely bug-free code-base with a fuck-ton of unit tests to prevent regressions!

    Ow. I think I hurt myself trying to make it through that post with a straight face.

    --

    I'm trying to teach myself to set people on fire with my mind... Is it hot in here?

  7. Re:Every Tuesday Is Patch Tuesday by DigiShaman · · Score: 1

    I suspect this is how CryptoWall 3.0 is getting machines infected.

    --
    Life is not for the lazy.
  8. Re:No IE 6??? by Anonymous Coward · · Score: 1

    And that matters how? Who cares if it isn't supported by MS anymore? It wasn't supported by MS when it was out there really. They only have ever done the bare minimum so it doesn't cut into their profits.

  9. Who uses IE? by wnfJv8eC · · Score: 1

    Like the first program I remove is IE.

    1. Re:Who uses IE? by Dutch+Gun · · Score: 4, Informative

      It's what everyone uses for downloading Firefox or Chrome on a new Windows machine.

      --
      Irony: Agile development has too much intertia to be abandoned now.
    2. Re:Who uses IE? by hcs_$reboot · · Score: 1

      It's what everyone uses for downloading Firefox or Chrome on a new Windows machine.

      Not everyone. I use a USB stick on which stands the latest Ubuntu release to add a Linux OS on the machine. This is yet another way to install Firefox, but at least it doesn't depend upon IE.

      --
      Slashdot, fix the reply notifications... You won't get away with it...
    3. Re:Who uses IE? by thegarbz · · Score: 1

      Look around you. If there are 8 people in the room then one of them is using IE. If your room is full of statistically representative samples of the internet.

      I congratulate you for not using IE. That doesn't mean there aren't literally millions of IE users out there.

    4. Re:Who uses IE? by antdude · · Score: 1

      Computer newbies, businesses, etc. :(

      --
      Ant(Dude) @ Quality Foraged Links (AQFL.net) & The Ant Farm (antfarm.ma.cx / antfarm.home.dhs.org).
  10. IE is better than Firefox these days. by Anonymous Coward · · Score: 3, Informative

    As an early adopter of Firefox I hate to admit this, but modern versions of IE are now better than Firefox is.

    Earlier today we learned all about vulnerabilities in Pocket, which as you may recall is part of the unwanted functionality that Mozilla forced on Firefox users earlier this summer.

    At the end of last week we learned all about how Firefox makes unexpected HTTP requests when hovering over a link.

    Earlier this month there was a very serious bug that allowed web sites to access the files of Firefox users.

    Earlier this year we learned about ads built into Firefox.

    The worst part about all of those stories is that they're just from this summer, and they're just the ones that Slashdot has bothered to report on!

  11. Re:Patch not for Windows XP... by Anonymous Coward · · Score: 1

    XP is fine, but why use IE on XP anyways???

  12. For the love of... by Anonymous Coward · · Score: 1

    ...all that is unholy.

    " If the current user is logged on with administrative user rights , an attacker who successfully exploited this vulnerability could take complete control of an affected system."

    When is MicroSoft going to get off their butts and fix their operating systems so that the first user is not defaulted to administrator rights or at least have the first user forced to make a 'normal' user account for normal usage? Even 'ancient' Linuxs only add the first user to sudoers so that they have to explicitly invoke rootly powers.

    Windows will never be a reasonable operating system while MicroSoft panders to n00bs who don't know any better (and probably couldn't function) than to run with administrator access 24/7. How many of these problems could be mitigated if this were not MicroSoft's default approach?

    A vast majority of their userbase can't handle the 'administrator account is only to do administration and normal account is for everything else' paradigm. I was impressed that normal users had a sudo-like function of asking a normal user for the admin password if they try to do admin-like things, but hate that the default first user is still an administrator and leaves most n00b users open to these kinds of exploits.

    It doesn't seem all that hard to have the first user set an admin password but create a normal day-to-day account for general use.

    1. Re:For the love of... by benjymouse · · Score: 2, Insightful

      When is MicroSoft going to get off their butts and fix their operating systems so that the first user is not defaulted to administrator rights or at least have the first user forced to make a 'normal' user account for normal usage? Even 'ancient' Linuxs only add the first user to sudoers so that they have to explicitly invoke rootly powers.

      Unlike Linux, Windows uses proper security tokens. Each process has it's own token governing what it can do to which resources. On Linux the "token" is - rather naively - a user id.

      When you log on to Windows - since Vista - with an account with administrative rights, thee token that is created for the shell process is 1) stripped of all administrative rights and 2) given an integrity level of "normal". Integrity levels are also part of the token.

      What it means is that *even when you log on as an administrator* you do not possess any administrative or god-like rights. You are a standard user.

      When you invoke a program that has a manifest which states that it requires some form of administrative rights, Windows will prompt you for "elevated" privileges. Only when you accept to use your administrative privileges will the process be started with a token with higher than standard user rights.

      It really is a much more elegant solution than the stupid effective user in Linux, where the description of a process rights is strongly tied to a user: There must exist a user with the specific sets of rights you want the process to have. Not so on Windows: Any process can have it's own token with fewer or more rights/privileges.

      You can turn off UAC (don't!), which is why Microsoft must write the disclaimer *If the current user is logged on with administrative user rights*. If you turn off UAC and log in with an administrative account - then you run all processes with full permissions/privileges.

      When is MicroSoft going to get off their butts and fix their operating systems so that the first user is not defaulted to administrator rights or at least have the first user forced to make a 'normal' user account for normal usage?

      They did fix it. You are just ignorant.

      How many of these problems could be mitigated if this were not MicroSoft's default approach?

      The answer is 92% - and it is mitigated by default.

      --
      Reading slashdot one-liner: (irm http://rss.slashdot.org/Slashdot/slashdot).rdf.item | fl title,desc*
    2. Re:For the love of... by gl4ss · · Score: 1

      funny thing is that malware never seems to have any trouble elevating the rights without asking the user, while for legitimate software the user gets bombarded with prompts.

      it's useless.

      just like on osx as well the separation is useless. malware finds a way around.

      --
      world was created 5 seconds before this post as it is.
    3. Re:For the love of... by cbhacking · · Score: 3, Interesting

      It actually goes a bit beyond this: even since Vista, IE has (by default) run with a *restricted* token that has even less privileges than the normal use. It is Low integrity level, meaning it can't interact with Medium integrity processes or write to most of the file system, registry, or other secured resources.

      Unfortunately, as Microsoft is wont to do, they fucked up the sandbox. The default configuration of IE only uses Protected Mode (Low IL) for the Internet and Restricted security zones. Notably, this excludes pages hosted on the local machine. Now, if you've got a code execution bug in IE, you can use that to run a webserver (on localhost). That webserver can host the exploit itself. Then you direct your hijacked, sandboxed IE to the localhost page, watch as the tab's process gets re-launched with normal privileges, and then you compromise that new process. You can protect yourself from this by going to Internet Options -> Security -> Local Intranet -> Enable Protected Mode.

      Similarly, the default "Don't notify me when I make changes to Windows settings" feature of UAC in Win7 (and above) is breakable; it's possible to get from medium IL to High IL (Administrator) if you have it enabled and are logged in as a member of the Administrators group. The fix is simple - just set it back to always prompting even for Windows settings (or do what I do, and have it actually ask for your password Sudo-style, though you need to use the Local Security Policy editor, secpol.msc, for that), or run as a non-member of Administrators - but most people never do any of these things.

      Microsoft is aware of both issues, and has issued no fixes for them. The POC program to silently elevate an arbitrary binary from Medium IL is blocked by Windows Defender (and probably other antivirus programs) but it would be easy enough to disguise it in such a way that the AV programs miss it.

      --
      There's no place I could be, since I've found Serenity...
    4. Re:For the love of... by Kjella · · Score: 1

      When you invoke a program that has a manifest which states that it requires some form of administrative rights, Windows will prompt you for "elevated" privileges. Only when you accept to use your administrative privileges will the process be started with a token with higher than standard user rights. It really is a much more elegant solution than the stupid effective user in Linux, where the description of a process rights is strongly tied to a user: There must exist a user with the specific sets of rights you want the process to have.

      It's possible they have more fine grained control behind the scenes but since the UAC prompt doesn't tell me anything I have to assume that any time I click yes that process can do anything, much like "sudo" on the Linux side. It might be ready for role-based security like on cell phones where they list the particular privileges the application wants, but I don't see it in practice.

      --
      Live today, because you never know what tomorrow brings
    5. Re: For the love of... by tlhIngan · · Score: 1

      Whoever thought that was an appropriate message should be beaten with a rubber hose.

      Well, technically it's an unexpected error. Which happened because your locale was not set to "en-us" - everyone who saw it generally was outside the US - Australia (en-au), Canada (en-ca), etc. For whatever reason, the tool accesses something by the locale rather than language, so when it tried to find an en-ca or en-au or en-uk image, it fails. Given it's something that shouldn't ever fail, well...

  13. Linux 101: Introduction to sudo .. by nickweller · · Score: 1

    @benjymouse: "When you invoke a program that has a manifest which states that it requires some form of administrative rights, Windows will prompt you for "elevated" privileges. Only when you accept to use your administrative privileges will the process be started with a token with higher than standard user rights. It really is a much more elegant solution than the stupid effective user in Linux."

    $su -c command ..

  14. Re:Really by Zero__Kelvin · · Score: 2

    " isn't it a good way to promote Edge, the new MS browser not affected by this bug?"

    Of course it is, in the same way that discovering that all the models of a car made by a certain company to date explode on impact makes me want to run right out and buy their slightly different newest model designed and manufactured by the same company.

    --
    Guns don't kill people; Physics kills people! - John Lithgow as Dick Solomon on Third Rock From The Sun
  15. Re:No IE 6??? by Zero__Kelvin · · Score: 2

    "Some companies simply won't migrate away from old software"

    FTFY

    " that would have cost the company a bunch of money."

    Luckily, using buggy antiquated software that is unsupported and no longer receives security updates doesn't incur any cost / overhead at all!

    It always baffles me to see incompetents who can't figure out that the most costly business move a company can make is to stagnate and refuse change with the times.

    --
    Guns don't kill people; Physics kills people! - John Lithgow as Dick Solomon on Third Rock From The Sun
  16. Re:Out-of-band patch for iExplorer versions 11 by jones_supa · · Score: 1

    Wouldn't the sandbox mechanism protect the user in more recent versions of IE?

  17. Re:No IE 6??? by F.Ultra · · Score: 1

    The bare minimum is still support.

  18. Re:Really by Rockets84 · · Score: 3, Insightful

    This bug has been around since IE 7? Wow, this just confirms that MS will only patch bugs once others find them and then they have to work on fixing them.

    So, what's your point? IE 7 through to 11 use the same Trident layout engine so it stands to reason one security flaw could affect IE 7 through to 11. Heartbleed was in OpenSSL's source for 3.5 years & Shellshock was in BASH since 1989 before anyone found them. Bugs can exist in software for years whether they are open or closed source.

  19. Re:Patch not for Windows XP... by Anonymous Coward · · Score: 1

    Patch not for Windows XP...

    Because: fuck you, you are not paying us money.

    No one supports a particular version of a thing they made until the end of time, not even GNU/Linux distros. It's not some sort of M$ is teh evil situation.

  20. Re:Really by U2xhc2hkb3QgU3Vja3M · · Score: 1

    Better boot up my XP box and let it update, then!

    Free Windows 10 at last! Woo-hoo!

  21. Re:No IE 6??? by F.Ultra · · Score: 1

    It's IE6 and WinXP, neither which ever could be seen as not broke.

  22. Re:Really by teh+dave · · Score: 1

    Yeah, but that doesn't matter. What matters is that this is Slashdot, and therefore whatever Microsoft does they're automatically Satan and must be derided.