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  • Cydia Package isslfix Fixes SSL Vulnerability For iOS < 4.3.5


    With the release of JailbreakMe 3.0 and Apple's response, iOS has been updated twice in order to patch the JailbreakMe exploit and other vulnerabilities. As mentioned in the iOS 4.3.4 article, updating to iOS 4.3.4 is not recommended as it only fixes the PDF exploit that JailbreakMe used. From there, Apple once again released a new version, 4.3.5, to patch other issues that were found. Although redsn0w is now able to jailbreak both 4.3.4 and 4.3.5, it is also not recommended as you will have to deal with a tethered jailbreak.

    Now: In Apple's current releases, there were things that were patched that were actually "legitimate" fixes (not in response to JailbreakMe 3.0). The problem is, if you're sticking jailbroken, you aren't able to get this security updates without having to upgrade and lose an untethered jailbreak. This issue has now been solved by jan0 (@0naj) who recently released a package called "isslfix" on Cydia.

    In the most basic terms, isslfix patches an SSL vulnerability known as CVE-2011-0228 without having to upgrade to the latest firmwares. All you simply need to do is install isslfix from Cydia and you will have the same protection that the later iOS firmwares offer.

    More detailed information can be found at jan0's GitHub page, along with information on how to check to see if you're vulnerable or not and how to deal with issues if they do arise.

    Read this article from The Recurity Lablog that explains the CVE-2011-0228 vulnerability:

    You have two options to install isslfix:

    • Install isslfix directly off Cydia from the BigBoss repo
    • Install the isslfix .deb file and follow the installation instructions in the Readme on the GitHub page


    Note: Rebooting your device will be required after installation.

    To test and see if you're vulnerable (or if you're protected with this package), visit the following website on your iDevice:

    https://issl.recurity.com/

    If what comes up looks anything like the picture below (showing the HTTPS), you're vulnerable.



    However, if it gives you a warning and a "Continue" screen before viewing the page, that means you're protected.

    Note: The iOS 5 beta already patches this so there is no need to install isslfix on any iOS 5 beta firmware.

    If you wish to read support documents from Apple discussing the different security updates from the firmwares at hand, read below:

    iOS 4.3.4
    iOS 4.3.5

    Keep up to date on information about this new fix by following jan0 on Twitter.

    Source(s): jan0 - GitHub, jan0, Apple, The Recurity Lablog
    This article was originally published in forum thread: Cydia Package isslfix Fixes SSL Vulnerability For iOS < 4.3.5 started by Joshua Tucker View original post
    Comments 41 Comments
    1. luvmytj's Avatar
      luvmytj -
      Nice work!
    1. Hosko817's Avatar
      Hosko817 -
      can somebody explain this in plain English if this is a necessary fix and why?
    1. wohhey's Avatar
      wohhey -
      Quote Originally Posted by Hosko817 View Post
      can somebody explain this in plain English if this is a necessary fix and why?
      Someone can hack your iDevice? I think itīs recommended to install this fix if you are on iOS 4.3.3 and jailbroken.
    1. Italia411's Avatar
      Italia411 -
      I keep getting the server can not be found when I try and access the link above.
    1. raduga's Avatar
      raduga -
      Quote Originally Posted by wohhey View Post
      Someone can hack your iDevice? I think itīs recommended to install this fix if you are on iOS 4.3.3 and jailbroken.
      I'd recommend that you install, if you are on iOS 4.3.3 or earlier, whether you're jailbroken or not.
      Though, only jb people are actually able to :/
    1. Mes's Avatar
      Mes -
      Nice work 0naj

      And nice write-up Josh
    1. Joshua Tucker's Avatar
      Joshua Tucker -
      Quote Originally Posted by Mes View Post
      Nice work 0naj

      And nice write-up Josh
      Thanks my good sir. I agree, awesome job 0naj!
    1. that_girl's Avatar
      that_girl -
      Nicely done! It works!
    1. Orby's Avatar
      Orby -
      This package is now available on BigBoss...

      Click me on your jailbroken iDevice!

      This exploit is based off the fact that intermediate X.509 certificates are not fully validated by iOS before being declared valid--specifically the "Basic Constraints" field.

      One of the X.509 certificate's fields is "Basic Constraints" which contains things such as what the certificate is valid for (e.g., code signature, S/MIME, SSL/TLS, etc.) and whether or not the certificate represents a Certificate Authority.

      The iSSL certificate (issued by iCA, one of Apple's cert authorities) Basic Constraints field reads:

      Code:
      Not Critical
      Is a Certificate Authority
      Maximum number of intermediate CAs: unlimited
      Apple did NOT sign a certificate like that. It was edited by the hackers; thereby breaking the original signature on the certificate. However, since iOS didn't check that signature, this certificate was accepted as valid.

      Since all iOS applications rely on the same framework (securityd) to access SSL/TLS connections, one fake certificate, set to accept any server (*.*, *.*.* etc.) could be used to intercept any and all data sent by the iPhone to a server of the exploiter's choice (a Man in the Middle attack).
    1. R.Mortera's Avatar
      R.Mortera -
      Thanks, downloaded the pkg, checked and not vulnerable. (it asked to continue)
    1. mmaboi21's Avatar
      mmaboi21 -
      I am so glad that the updates in the future will not rely on restore's.
      Nice work
    1. xclusiveiphone's Avatar
      xclusiveiphone -
      I get 403 forbidden error. Am I protected?
    1. Mes's Avatar
      Mes -
      Quote Originally Posted by xclusiveiphone View Post
      I get 403 forbidden error. Am I protected?
      Try using https (not http)

      Quote Originally Posted by Orby View Post
      ... (a Man in the Middle attack).
      You're the man
    1. GenesisDH's Avatar
      GenesisDH -
      Note about iOS5 beta part of the OP: If you are on iOS beta 3 or lower jailbroken (some JB-ed 3GS with the 6.15.00 iPad baseband can't do beta 4-5 until SB is updated), then you're still vulnerable and should also install this patch.

      I tried the site and found it to be true for beta 3.
    1. ActionMax09's Avatar
      ActionMax09 -
      Quote Originally Posted by Italia411 View Post
      I keep getting the server can not be found when I try and access the link above.
      Me as well, you are not alone.
    1. kschong710's Avatar
      kschong710 -
      i using 4.3.3 JB and just follow install issl.recurity
      the outcome is same with the image that post.
      without error did it mean i`m vulnerable?
    1. ronw's Avatar
      ronw -
      Quote Originally Posted by kschong710 View Post
      i using 4.3.3 JB and just follow install issl.recurity
      the outcome is same with the image that post.
      without error did it mean i`m vulnerable?
      Wierd cuz I'm experiencing the same issue. I checked that page first to confirm I was volnerable then installed which forced reboot but still get page wo it asking to continue or not

      Quote Originally Posted by ronw View Post
      Wierd cuz I'm experiencing the same issue. I checked that page first to confirm I was volnerable then installed which forced reboot but still get page wo it asking to continue or not
      Nm, cleared history and closed old page and it worked fine
    1. Mista Brothason's Avatar
      Mista Brothason -
      Should we install if we're on 4.2.1?
    1. xclusiveiphone's Avatar
      xclusiveiphone -
      Quote Originally Posted by Mista Brothason View Post
      Should we install if we're on 4.2.1?
      Yes, but I'm not quite sure if it will add more "security" to our phones.
    1. Mista Brothason's Avatar
      Mista Brothason -
      Quote Originally Posted by xclusiveiphone View Post
      Yes, but I'm not quite sure if it will add more "security" to our phones.
      What about PDF patcher 2