Alternatively, you can use this ASR patcher by /u/gjest to automatically patch ASR and produce a.patch file by diffing both files: bsdiff asr.patch You will notice the branch visually pointing from signature failed (text no longer visible) to signature passed Then Edit->Patch Program->Apply patches to input file, and check box for create a backup. Apply patch by clicking in signature failed line, then by going in IDA to Edit->Patch Program->Change Byte, and replace the first bytes with D2 E7.In this case, it will be from "176E4" to "1768C", which will be D2 E7 Calculate the value needed to do a branch from failed instruction to passed instruction (which should be before or after it).In IDA's right panel, search for "failed signature".Grab the ASR file after mounting the decrypted Restore ramdisk found in "usr/sbin/" and load in IDA as above.This offset is needed to patch Sandbox, which goes together with first offset. Look for offset in IDA at "BL sub_80EA3F70". Double click "sub_80776B2C", which is the 2nd BL in the instruction.Double click "loc_80775D12" right before the text we searched for.In IDA's right panel, search for "entitlements are not a dictionary".When done, we will be looking for 2 offsets: Load the final decrypted kernel file () using IDA, select "ARM Little Endian" under "Processor Type" and let it do its thing. We need to disassemble kernel in order to retreive offsets that we will use when patching iBEC. On iOS 10 the kernelcache is not encrypted, meaning lzssdec should be used directly (it is still compressed).img3decrypt.rb pads the decrypted file with extra zeros that result in garbage data at the end of the file after decompression with lzssdec.The ramdisk has a different filename for each version and device, while the other three have the same name across versions (with n41 corresponding to iPhone5,1) The filenames depend on iOS version and device.lzssdec -o 384 (decompresses the decrypted file, skipping a 384 byte header).img3decrypt.rb 41 crypted (decrypts it).For kernel, there are a couple of ways, but you can use Img3decrypt (Ruby) and lzssdec (C++ source):.For all files except kernel: xpwntool -k -iv.Decrypt the files using Firmware Keys and xpwntool.Change the extension from IPSW to ZIP, and grab the following files:.Alternatively, you can use partial-zip to grab the files below
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |