This doesn’t work if the device has been started for the first time without the user unlocking it at least once. A logical acquisition is usually the technique used if you can get the lockdown file (a pairing record) from the user’s computer. It’s similar to the process of copying a file or folder from one location to another. A logical acquisition on the other hand does not do a bit-by-bit copy. Apple’s iOS Kernel Patch Protection (KPP) ExplainedĪ physical acquisition is a bit-by-bit dump of the storage.There’s less modifications to the evidence. This doesn’t need to grant access to the root (/) so it’s much safer from a forensics standpoint. Instead of trying to escalate privileges to get root, newer iOS 12 techniques involve a rootless jailbreak. Cydia Impactor is used to get around these requirements to install jailbreaks. An IPA image, for example, is signed by a private key and the main challenge is getting unsigned binaries to run. Code signing prevents you from modifying or executing custom code on the device. Rooting a device usually involves exploiting a security vulnerability on the OS which would circumvent code signing and other security measures. There are many tools to root a device, such as: Most importantly, it gives you root access to the file system as well as the opportunity to enable SSH on the device. Jailbreaking allows you to get around the sandbox and kernel patch protection. There is a tradeoff between acquiring access and altering part of the device that secures it. Almost all solutions involve jailbreaking the device to gain access. Evidence that is tampered with will be inadmissible in court.īeyond copying, backing up and preserving the current state of the device, the next main challenge in forensics recovery is dealing with a secured device. But the most important practice for any device is to copy and work with the data without altering the original device in any way. You may get lucky when presented with an unsecured device where you have full access. It’s not meant to be a full guide but rather to present the general idea and overall process that you can take away and apply to your unique situation. This is a brief article that introduces the concepts of forensics on iOS. IOS Forensics Part 1 | Kolin Stürt Kolin Stürt
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