[<prev] [next>] [<thread-prev] [day] [month] [year] [list]
Date: Tue, 5 Jul 2022 23:18:18 +0800 (GMT+08:00)
From: duoming@....edu.cn
To: oss-security@...ts.openwall.com
Subject: Re: Linux kernel: UAF vulnerabilities in rose protocol
Hello,
On Sun, 3 Jul 2022 12:26:09 +0800 Duoming Zhou wrote:
> Hello there,
>
> There are use-after-free vulnerabilities caused by timer handler in net/rose/rose_timer.c
> of linux that allow attackers to crash linux kernel without any privileges.
>
> =*=*=*=*=*=*=*=*= Bug Details =*=*=*=*=*=*=*=*=
>
> The root cause is that del_timer() could not stop the timer handler that is running
> and the refcount of sock is not managed properly in rose protocol.
>
> Attackers can use an active rose network interface, then, call close(), bind()
> and connect() syscall to crash Linux kernel without any privileges.
>
> =*=*=*=*=*=*=*=*= Bug Effects =*=*=*=*=*=*=*=*=
>
> We can successfully trigger the vulnerabilities to crash the linux kernel.
>
> BUG: KASAN: use-after-free in _raw_spin_lock+0x5a/0x110
> Write of size 4 at addr ffff88800ae59098 by task swapper/3/0
> ...
> Call Trace:
> <IRQ>
> dump_stack_lvl+0xbf/0xee
> print_address_description+0x7b/0x440
> print_report+0x101/0x230
> ? irq_work_single+0xbb/0x140
> ? _raw_spin_lock+0x5a/0x110
> kasan_report+0xed/0x120
> ? _raw_spin_lock+0x5a/0x110
> kasan_check_range+0x2bd/0x2e0
> _raw_spin_lock+0x5a/0x110
> rose_heartbeat_expiry+0x39/0x370
> ? rose_start_heartbeat+0xb0/0xb0
> call_timer_fn+0x2d/0x1c0
> ? rose_start_heartbeat+0xb0/0xb0
> expire_timers+0x1f3/0x320
> __run_timers+0x3ff/0x4d0
> run_timer_softirq+0x41/0x80
> __do_softirq+0x233/0x544
> irq_exit_rcu+0x41/0xa0
> sysvec_apic_timer_interrupt+0x8c/0xb0
> </IRQ>
> <TASK>
> asm_sysvec_apic_timer_interrupt+0x1b/0x20
> RIP: 0010:default_idle+0xb/0x10
> RSP: 0018:ffffc9000012fea0 EFLAGS: 00000202
> RAX: 000000000000bcae RBX: ffff888006660f00 RCX: 000000000000bcae
> RDX: 0000000000000001 RSI: ffffffff843a11c0 RDI: ffffffff843a1180
> RBP: dffffc0000000000 R08: dffffc0000000000 R09: ffffed100da36d46
> R10: dfffe9100da36d47 R11: ffffffff83cf0950 R12: 0000000000000000
> R13: 1ffff11000ccc1e0 R14: ffffffff8542af28 R15: dffffc0000000000
> ...
> Allocated by task 146:
> __kasan_kmalloc+0xc4/0xf0
> sk_prot_alloc+0xdd/0x1a0
> sk_alloc+0x2d/0x4e0
> rose_create+0x7b/0x330
> __sock_create+0x2dd/0x640
> __sys_socket+0xc7/0x270
> __x64_sys_socket+0x71/0x80
> do_syscall_64+0x43/0x90
> entry_SYSCALL_64_after_hwframe+0x46/0xb0
>
> Freed by task 152:
> kasan_set_track+0x4c/0x70
> kasan_set_free_info+0x1f/0x40
> ____kasan_slab_free+0x124/0x190
> kfree+0xd3/0x270
> __sk_destruct+0x314/0x460
> rose_release+0x2fa/0x3b0
> sock_close+0xcb/0x230
> __fput+0x2d9/0x650
> task_work_run+0xd6/0x160
> exit_to_user_mode_loop+0xc7/0xd0
> exit_to_user_mode_prepare+0x4e/0x80
> syscall_exit_to_user_mode+0x20/0x40
> do_syscall_64+0x4f/0x90
> entry_SYSCALL_64_after_hwframe+0x46/0xb0
>
> =*=*=*=*=*=*=*=*= Bug Fix =*=*=*=*=*=*=*=*=
>
> The patch that have been applied to mainline Linux kernel is shown below.
> https://github.com/torvalds/linux/commit/9cc02ede696272c5271a401e4f27c262359bc2f6
>
> =*=*=*=*=*=*=*=*= Timeline =*=*=*=*=*=*=*=*=
>
> 2022-06-30: commit 9cc02ede6962 accepted to mainline kernel
> 2022-07-03: send an email to secalert@...hat.com in order to request CVE number
>
> =*=*=*=*=*=*=*=*= Credit =*=*=*=*=*=*=*=*=
>
> Duoming Zhou <duoming@....edu.cn>
CVE-2022-2318 has been assigned to this problem.
Best Regards,
Duoming Zhou
Powered by blists - more mailing lists
Please check out the
Open Source Software Security Wiki, which is counterpart to this
mailing list.
Confused about mailing lists and their use?
Read about mailing lists on Wikipedia
and check out these
guidelines on proper formatting of your messages.
