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Files from bazad

Email addressbazad at google.com
First Active2019-01-24
Last Active2020-02-27
Samsung Kernel Arbitrary /dev/vipx / /dev/vertex kfree
Posted Feb 27, 2020
Authored by Google Security Research, bazad

This function, reached through ioctl VS4L_VERTEXIOC_QBUF in the Samsung kernel, has an error case that cannot function correctly. It reads in an array of pointers from userspace and in-place replaces each userspace pointer with a kernel pointer allocated with kzalloc(). Unfortunately, in the error case it will iterate over all the pointers in the array (regardless of how many, if any, were converted to kernel pointers) and call kfree() on each of them. Thus, all it takes to call kfree() on an arbitrary number of controlled pointers is to make the second copy_from_user() fail after successfully copying in the desired number of pointers to free.

tags | exploit, arbitrary, kernel
MD5 | 05651491fa9a6c8a32c0a6dc538ee2f3
Samsung Kernel /dev/hdcp2 hdcp_session_close() Race Condition
Posted Feb 27, 2020
Authored by Google Security Research, bazad

In the Samsung kernel, the /dev/hdcp2 device ioctls seem to implement no locking, leading to multiple exploitable race conditions. For example, you can open a session with the HDCP_IOC_SESSION_OPEN ioctl, and then close it in multiple threads in parallel with the HDCP_IOC_SESSION_CLOSE. Since no locking is implemented in hdcp_session_close(), memory will be corrupted and the system will become unstable.

tags | exploit, kernel
MD5 | d4c16edeb7e9bb6b2a66c4a9bfe48796
Samsung Kernel /dev/vipx Pointer Leak
Posted Feb 27, 2020
Authored by Google Security Research, bazad

The function __vipx_ioctl_put_container() in the Samsung kernel calls copy_to_user() on a vs4l_container_list structure that contains a kernel pointer, exposing that kernel pointer to userspace just before it gets passed to kfree().

tags | exploit, kernel
MD5 | 4d763dd7a0edc38113e6a84e2a16619c
macOS/iOS IOAccelCommandQueue2::processSegmentKernelCommand() Out-Of-Bounds Timestamp Write
Posted Feb 7, 2020
Authored by Google Security Research, bazad

macOS and iOS suffers from an out-of-bounds timestamp write in IOAccelCommandQueue2::processSegmentKernelCommand().

tags | exploit
systems | ios
advisories | CVE-2020-3837
MD5 | 04c093e6bde68cbe168364f56f38b9ee
XNU OUserClient::_sendAsyncResult64() ipc_port Pointer Disclosure
Posted Feb 7, 2020
Authored by Google Security Research, bazad

The XNU function IOUserClient::_sendAsyncResult64() discloses the address of the ipc_port to which the notification is sent in the Mach message enqueued on the notification port.

tags | exploit
advisories | CVE-2020-3836
MD5 | 6ecb90fde4136a6abb3c8382394b9ae5
macOS/iOS XNU mk_timer_create_trap() Race Condition
Posted Feb 7, 2020
Authored by Google Security Research, bazad

macOS and iOS suffer from a race condition in XNU's mk_timer_create_trap() that can lead to type confusion.

tags | exploit
systems | ios
advisories | CVE-2020-3853
MD5 | 4e9dc95b3aaaa93bb8e5558c52ec93c3
macOS/iOS kern_stack_snapshot_internal() Userspace Share Issue
Posted Feb 7, 2020
Authored by Google Security Research, bazad

macOS and iOS suffer from an issue where kern_stack_snapshot_internal() shares non-zeroed kernel pages with userspace.

tags | exploit, kernel
systems | ios
advisories | CVE-2020-3875
MD5 | 9ba8ef3758b3008ca2cd79dcec2effb0
macOS Kernel wait_for_namespace_event() Race Condition / Use-After-Free
Posted Dec 18, 2019
Authored by Google Security Research, bazad

In the macOS kernel, the XNU function wait_for_namespace_event() in bsd/vfs/vfs_syscalls.c releases a file descriptor for use by userspace but may then subsequently destroy that file descriptor using fp_free(), which unconditionally frees the fileproc and fileglob. This opens up a race window during which the process could manipulate those objects while they're being freed. Exploitation requires root privileges.

tags | exploit, kernel, root
systems | bsd
MD5 | cba1e82afa4ec28fd0073d6cfded8a11
iOS / macOS Uninitialized Kernel Stack Disclosure
Posted Jan 29, 2019
Authored by Google Security Research, bazad

iOS and macOS suffer from an if_ports_used_update_wakeuuid() 16-byte uninitialized kernel stack disclosure vulnerability.

tags | exploit, kernel
systems | ios
advisories | CVE-2019-6209
MD5 | 945324ecdaec6370900aeaf4e6688a59
iOS / macOS task_swap_mach_voucher() Use-After-Free
Posted Jan 24, 2019
Authored by Google Security Research, bazad

task_swap_mach_voucher() on iOS and macOS have an issue where task_swap_mach_voucher() does not respect MIG semantics leading to a use-after-free condition.

tags | exploit
systems | ios
advisories | CVE-2019-6225
MD5 | b54e0bcff3347b2276ccbec5eaa71bdc
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