Unc0ver Black Edition -

By embedding a polymorphic payload inside the alignment padding of critical Mach-O binaries (launchd, kernelcache), U0-BE achieves a "Phoenix" state—the device reboots into a jailed state, but the moment a specific sequence of capacitive touches is applied to the display controller, the boot sequence is intercepted. 2.1 Mach-O Anomalies The core innovation lies in LC_SEGMENT_SPLIT_INFO commands. Typically, these are used for dyld shared cache optimization. U0-BE injects a 64-byte shim into the reserved padding between load commands. This shim is ignored by Apple’s cryptographic signature validation because the signature covers only the code sections, not the metadata layout .

Author: Red Team Alpha (RTA) Research Group Presented at: The Symposium on Invisible Threats (SIT), 2024 Abstract The perpetual cat-and-mouse game between iOS jailbreak developers and Apple’s Secure Enclave has entered a new epoch. While traditional jailbreaks rely on userland privilege escalation or known kernel bugs (CVE-XXXX), the Unc0ver Black Edition (U0-BE) introduces a novel, hardware-adjacent persistence mechanism. This paper details the first publicly documented technique that leverages Mach-O metadata poisoning and NVRAM ghosting to achieve a tethered, yet undetectable, bootrom-level execution prior to Apple’s iBoot integrity verification. U0-BE does not merely jailbreak the device; it re-architects the trust chain from the silicon up. 1. Introduction Since the dawn of the checkm8 bootrom exploit, the industry has believed that Apple’s introduction of the SEP (Secure Enclave Processor) and the A11’s hardware-level memory tagging would end untethered persistence. We demonstrate that this belief is flawed. The Black Edition targets a previously overlooked attack surface: the reserved, non-volatile sectors of the NVRAM that survive a DFU (Device Firmware Update) restore. Unc0ver Black Edition