IOSurface Kernel Exploit

This vulnerability, along with the Malformed CFF Vulnerability, was used in Star/JailbreakMe 2.0. It is a buffer overflow in the handling of the kernel-extension for managing pixel buffers used to get root privileges.

Credit

comex

Exploit

Selector 19 was Vulnerable to a buffer overflow that would allow access to the root filesystem without making the kernel fail signature check

Selector	Action	Input	Output
0	lookupFromMachPort	-	1,208 bytes of stuff
1	release	IOSurfaceID surfaceID	-
2	lock	struct IOSurfaceLockArg	1,208 bytes of stuff
3	unlock	struct IOSurfaceLockArg	struct IOSurfaceLockSeedArg
4	lockPlane	struct IOSurfaceLockArg	1,208 bytes of stuff
5	unlockPlane	struct IOSurfaceLockArg	struct IOSurfaceLockSeedArg
6	lookup	void* ???	1,208 bytes of stuff
7	setYCbCrMatrix	IOSurfaceID surfaceID, uint32_t YCbCrMatrix	-
8	wrapClientImage	28 bytes of stuff	1,208 bytes of stuff
9	wrapClientMemory	void* param0, void* param1	1,208 bytes of stuff
10	getYCbCrMatrix	IOSurfaceID surfaceID	uint32_t YCbCrMatrix
11	setValue	?	-
12	getValueMethod	?	?
13	kIOSurfaceMethodRemoveValue	?	-
14	bindAccel	IOSurfaceID surfaceID, void* unknown0, void* unknown4	-
15	bindAccelOnPlane	IOSurfaceID surfaceID, void* param1, void* param2, size_t planeIndex	-
16	readLimits	-	20 bytes of stuff.
17	kIOSurfaceMethodIncrementUseCount	IOSurfaceID surfaceID	-
18	kIOSurfaceMethodDecrementUseCount	IOSurfaceID surfaceID	-
19	?	void* ???	void* ???
20	setSurfaceNotify	24 bytes of stuff	-
21	removeSurfaceNotify	24 bytes of stuff	-