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Difference between revisions of "Untethered jailbreak"

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An '''untethered jailbreak''' is a jailbreak wherein a user can reboot their device at will, and have their device start up with the jailbreak automatically applied without the assistance of a computer or a utility on the device.
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== Summary ==
  
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An untethered jailbreak is a jailbreak where your device does not require you to reboot with a connection to an external device capable of executing commands on the device.
 
   
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These jailbreaks can be applied via multiple different methods, the most common of which being kernel exploits.
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== Device ==
  
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All [[iPhone]], [[iPod touch]], and [[K48ap|iPad]] models except the [[N90ap|iPhone 4]] have an untethered jailbreak, albeit not necessarily at the latest firmware.
  
   
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== Kernel exploits ==
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Devices with a newer bootrom, which include some [[N88ap|iPhone 3GS]] units, "MC" model [[N72ap|iPod touch 2G]] units, [[N18ap|iPod touch 3G]] units, and [[N90ap|iPhone 4]] units currently don't have a jailbreak for iOS 4.0. The iPad doesn't either, but iOS 4.0 isn't available for it.
  
   
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Most untethered jailbreaks rely on vulnerabilities in the kernel and early boot process, typically using a combination of codesigning bypasses and manipulating the system into executing a binary early in the boot process (or obtaining unsigned code execution via a vulnerability in an existing startup process). Once code execution has been obtained, a kernel exploit is used in order to patch the currently loaded kernel to allow for the rootfs to be remounted as read/write, and to allow for unsigned code execution.
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== Operating System ==
  
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As of right now, there is not way to jailbreak the iOS 4 untethered on Linux-based operating systems. This can be done, however, with Mac OS X or Windows.
  
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Tools that use kernel exploits to achieve untethered jailbreaks:
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*[[Spirit]]
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*[[Star|JailbreakMe 2.0 (star)]]/[[Saffron|JailbreakMe 3.0 (saffron)]]
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*[[limera1n]]
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*[[greenpois0n]]
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*[[Absinthe]]
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*[[unthredera1n]]
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*[[evasi0n]]
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*[[p0sixspwn]]
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*[[evasi0n7]]
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*[[Pangu]]
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*[[Pangu8]]
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*[[TaiG]]
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*[[etasonJB]]
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*[[UntetherHomeDepot]]
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*[[Pangu9]]
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*[[Fugu14]]
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== BootROM exploits ==
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Older devices, such as the iPhone 3GS, iPod touch 2 (old bootrom) and earlier, have had vulnerabilities discovered in the [[BootROM]] that are able to be executed without the assistance of DFU mode (such as via a malformed image in the NOR) allowing for stages of the boot chain to be overwritten with custom code, such as a patched LLB/iBoot to allow for an unsigned kernel, and a custom boot logo. Examples of bootrom exploits that allow for untethered code execution are [[Pwnage]], [[0x24000 Segment Overflow|24kpwn]] and [[alloc8 Exploit|alloc8]].
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Tools that use bootROM exploits to achieve untethered jailbreaks:
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*[[redsn0w]]
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*[[sn0wbreeze]]
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*[[PwnageTool]]
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*[[ipwndfu]]
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== iBoot exploits ==
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Some jailbreaks abuse vulnerabilities in the currently installed [[iBoot]] in order to patch out signature checks or load an alternative iBoot, therefore being able to load a patched and jailbroken kernel. Very few jailbreak utilities opt to use this method, as iBoot exploits are rare to come across and are able to be patched by Apple with software updates, thereby only being able to be used if blobs have been saved, or if the device was discontinued before Apple released a patch.
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==See also==
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*[[Jailbreak]]
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*[[Jailbreak Exploits]]
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*[[Tethered jailbreak]]
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*[[Semi-tethered jailbreak]]
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*[[Semi-untethered jailbreak]]
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[[Category:Jailbreaking]]

Latest revision as of 20:07, 24 October 2021

An untethered jailbreak is a jailbreak wherein a user can reboot their device at will, and have their device start up with the jailbreak automatically applied without the assistance of a computer or a utility on the device.

These jailbreaks can be applied via multiple different methods, the most common of which being kernel exploits.

Kernel exploits

Most untethered jailbreaks rely on vulnerabilities in the kernel and early boot process, typically using a combination of codesigning bypasses and manipulating the system into executing a binary early in the boot process (or obtaining unsigned code execution via a vulnerability in an existing startup process). Once code execution has been obtained, a kernel exploit is used in order to patch the currently loaded kernel to allow for the rootfs to be remounted as read/write, and to allow for unsigned code execution.

Tools that use kernel exploits to achieve untethered jailbreaks:

BootROM exploits

Older devices, such as the iPhone 3GS, iPod touch 2 (old bootrom) and earlier, have had vulnerabilities discovered in the BootROM that are able to be executed without the assistance of DFU mode (such as via a malformed image in the NOR) allowing for stages of the boot chain to be overwritten with custom code, such as a patched LLB/iBoot to allow for an unsigned kernel, and a custom boot logo. Examples of bootrom exploits that allow for untethered code execution are Pwnage, 24kpwn and alloc8.

Tools that use bootROM exploits to achieve untethered jailbreaks:

iBoot exploits

Some jailbreaks abuse vulnerabilities in the currently installed iBoot in order to patch out signature checks or load an alternative iBoot, therefore being able to load a patched and jailbroken kernel. Very few jailbreak utilities opt to use this method, as iBoot exploits are rare to come across and are able to be patched by Apple with software updates, thereby only being able to be used if blobs have been saved, or if the device was discontinued before Apple released a patch.

See also

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