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It's now too late to undo your OTA and restore to 7. Some Cydia tweaks are not yet compatible with iOS 7. The situation will improve as developers will update their software. Download Specs What's New. Windows macOS. Last updated:. April 4, User rating:. Jailbreaking your iOS device can void its warranty and render it useless.
Installation: Backup your device using iTunes or iCloud before using evasi0n. If something breaks, you'll always be able to recover your data. Please disable the lock passcode of your iOS device before using evasi0n. To extract the payloads from the binary and dump the data into a file that can be examined:. Before examining the dumped payload files, some information can be gathered from other parts of the Mach-O binary.
By dumping the symbol table from the binary, it is possible to see the names of functions used in the binary that are linked to in external libraries. Something that stands out in the evasi0n binary is the usage of the gzip library. From that, it can be deduced that the payloads that were extracted are compressed using gzip. This can be verified by running the command file on the extracted payloads.
Seems that the payloads were stored as simply. Now having an understanding of how the payloads were supposed to be used and packaged, their contents can be examined in detail to see what they are used for. Noteably, when attempting to run the evasi0n. This is very true, as it needs to download the WWDC app as part of the exploit.
Examining the symbol table we do see that there are references to "send", "recv", and other C-socket calls, however they appear to be used exclusively for the unix socket to communicate directly with the iOS device. Examining the list of libraries linked to the binary gives some insight to how it was checking for a network connection. This stands out due to the compatibility version listed being higher than the version OS X Checking the symbol table again evidence of how libcurl can be seen.
This appears to be a binary file that dictates the internal operation of the evasi0n7. Specifically it is known to be able to enable and disable ability to install the TaiG payloads. The major controversy surrounding this release was that the evasi0n7.
If this check was successful, it would install the TaiG app store by default instead of Cydia, and present Cydia as a secondary option. See followups at drspringfield. By placing data in a known location past the array it's possible to hijack the tty structure and special read and write data from ioctl calls, and control function pointers to control execution. The exploit is actually quite simple to trigger.
I discovered this with a simple fuzzing script to test out every single device node. Here's a small sample script that should crash the latest maverick update. It seems that only 16 spaces are allocated for these terminals and if you make a device node with major 16 and minor larger that 16 you start getting out of bounds of the array. The maximum size of device nodes are about 0x giving to the ability to offset your pointer into a crafted structure very large.
The only hard part is finding which zones are ahead of your array you can index into. The crash happens in…. The problem is they lack the check to see if the minor number is higher than the number of spots allocated. The problem comes down to this, I'll try to comment code as I go through it It just automatically returns this array indexed with a user controllable value.
Crash but true, let's look more into this structure we can control if we create a large minor number. The first pointer in this structure is a pointer to a tty structure. This structure is easily readable and writable using using user land APIS. It also includes some function pointers in there which can be triggered to gain. You can imagine all the power you could do if you can control all these structures carefully. That will be the difficulty when trying to exploit.
You need to find a kernel zone past this array and allocate your data into it in a way you always know the offset.
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