├── EXAMPLE.TXT
├── LICENSE.TXT
├── README.TXT
└── smram_parse.py
/EXAMPLE.TXT:
--------------------------------------------------------------------------------
1 | $ ./smram_parse.py SMRAM.bin flash_image.bin
2 |
3 | [+] Copying "flash_image.bin" to "fw_image_1524198678"...
4 | [+] Unpacking "fw_image_1524198678"...
5 |
6 | parseMeRegion: ME region is empty
7 | parseSections: non-UEFI data found in sections area
8 | parsePadFileBody: non-UEFI data found in pad-file
9 | findFitRecursive: real FIT table found at physical address FFA80100h
10 | -------------------------------------------------------------------
11 | Address | Size | Ver | CS | Type
12 | -------------------------------------------------------------------
13 | _FIT_ | 00000030h | 0100h | 00h | FIT Header
14 | 00000000FFA80280 | 00000000h | 0100h | 00h | Microcode
15 | 00000000FFA97A80 | 00000000h | 0100h | 00h | Microcode
16 |
17 | [+] SMRAM is at 0x8b400000:8bbfffff
18 | [+] EFI_SMM_SYSTEM_TABLE2 is at 0x8b7fa730
19 |
20 | SMI ENTRIES:
21 |
22 | CPU 0: 0x8b7d5000
23 | CPU 1: 0x8b7d5800
24 | CPU 2: 0x8b7d6000
25 | CPU 3: 0x8b7d6800
26 |
27 | LOADED SMM DRIVERS:
28 |
29 | 0x8b6b9000: size = 0x00005f20, ep = 0x8b6b9b70, name = PchInitSmm
30 | 0x8b6c0000: size = 0x00002600, ep = 0x8b6c05c0, name = PowerMgmtSmm
31 | 0x8b6c3000: size = 0x00015440, ep = 0x8b6c3300, name = BiosGuardServices
32 | 0x8b6d9000: size = 0x00001260, ep = 0x8b6d9840, name = NvramSmi
33 | 0x8b6db000: size = 0x00002420, ep = 0x8b6db850, name = RtcWakeup
34 | 0x8b6df000: size = 0x00002960, ep = 0x8b6df840, name = OemSmi
35 | 0x8b6e2000: size = 0x00006d60, ep = 0x8b6e3850, name = ItkSmmVars
36 | 0x8b6e9000: size = 0x00001880, ep = 0x8b6e9b80, name = CrbSmi
37 | 0x8b6eb000: size = 0x00018980, ep = 0x8b6ebf80, name = UsbRt
38 | 0x8b704000: size = 0x00001880, ep = 0x8b704340, name = TcgSmm
39 | 0x8b706000: size = 0x00002300, ep = 0x8b706870, name = SdioSmm
40 | 0x8b71c000: size = 0x00002500, ep = 0x8b71c330, name = NvmeSmm
41 | 0x8b71f000: size = 0x00004860, ep = 0x8b71fa10, name = KbcEmul
42 | 0x8b724000: size = 0x00002640, ep = 0x8b7248c0, name = SmmHddSecurity
43 | 0x8b728000: size = 0x00003700, ep = 0x8b728d10, name = CmosSmm
44 | 0x8b72c000: size = 0x00001380, ep = 0x8b72c850, name = BootScriptHideSmm
45 | 0x8b72e000: size = 0x00006f80, ep = 0x8b72e430, name = SaLateInitSmm
46 | 0x8b735000: size = 0x00001840, ep = 0x8b735b50, name = PttWrapper
47 | 0x8b737000: size = 0x00004b00, ep = 0x8b737bd0, name = SmmPlatform
48 | 0x8b73c000: size = 0x000009c0, ep = 0x8b73c2a0, name = SmramSaveInfoHandlerSmm
49 | 0x8b73e000: size = 0x00001dc0, ep = 0x8b73eba0, name = AcpiModeEnable
50 | 0x8b740000: size = 0x00001100, ep = 0x8b740800, name = TcoSmi
51 | 0x8b742000: size = 0x00004800, ep = 0x8b742bb0, name = SleepSmi
52 | 0x8b747000: size = 0x000049a0, ep = 0x8b747bb0, name = PowerButton
53 | 0x8b74d000: size = 0x00003820, ep = 0x8b74dcc0, name = NbSmi
54 | 0x8b751000: size = 0x00000ba0, ep = 0x8b751360, name = PiSmmCommunicationSmm
55 | 0x8b76a000: size = 0x00001780, ep = 0x8b76aa40, name = CpuSpSMI
56 | 0x8b76d000: size = 0x00007d40, ep = 0x8b76f0c0, name = PchSmiDispatcher
57 | 0x8b775000: size = 0x00004b60, ep = 0x8b7761d0, name = FlashSmiSmm
58 | 0x8b77a000: size = 0x00001340, ep = 0x8b77a2c0, name = PchSpiSmm
59 | 0x8b77c000: size = 0x00002dc0, ep = 0x8b77cbe0, name = SbRunSmm
60 | 0x8b77f000: size = 0x00000ae0, ep = 0x8b77f290, name = SmmExceptionInfo
61 | 0x8b780000: size = 0x0000f2a0, ep = 0x8b782390, name = NVRAMSmm
62 | 0x8b790000: size = 0x00000fa0, ep = 0x8b7902d0, name = SmmLockBox
63 | 0x8b791000: size = 0x00001060, ep = 0x8b791810, name = RuntimeSmm
64 | 0x8b793000: size = 0x000033c0, ep = 0x8b7939f0, name = S3SaveSmm
65 | 0x8b7a5000: size = 0x0000e400, ep = 0x8b7a5d10, name = CryptoSMM
66 | 0x8b7b4000: size = 0x00002920, ep = 0x8b7b4800, name = AhciSmm
67 | 0x8b7b7000: size = 0x00001060, ep = 0x8b7b7270, name = PchSmbusSmm
68 | 0x8b7df000: size = 0x00006d20, ep = 0x8b7e0d90, name = PiSmmCpuDxeSmm
69 | 0x8b7e6000: size = 0x000009a0, ep = 0x8b7e62b0, name = CpuIo2Smm
70 | 0x8b7e8000: size = 0x00005780, ep = 0x8b7e8da0, name = FlashDriverSmm
71 | 0x8b7f0000: size = 0x00005300, ep = 0x8b7f1520, name = StatusCodeSmm
72 | 0x8b7fa000: size = 0x000055a0, ep = 0x8b7fa8d0, name = PiSmmCore
73 |
74 | [+] Found prte structure at offset 0x2b5f90
75 |
76 | SMM PROTOCOLS:
77 |
78 | 0x8b7f6390: addr = 0x8b7f0ef0, image = StatusCodeSmm, guid = 441FFA18-8714-421E-8C95587080796FEE
79 | 0x8b7f6290: addr = 0x8b7f0ee0, image = StatusCodeSmm, guid = EFI_SMM_RSC_HANDLER_PROTOCOL
80 | 0x8b7f6190: addr = 0x8b7f0f00, image = StatusCodeSmm, guid = EFI_SMM_STATUS_CODE_PROTOCOL
81 | 0x8b7e7990: addr = 0x8b7e89e8, image = FlashDriverSmm, guid = FLASH_SMM_PROTOCOL
82 | 0x8b7e7890: addr = 0x8b7e6280, image = CpuIo2Smm, guid = EFI_SMM_CPU_IO2_PROTOCOL
83 | 0x8b7e7610: addr = 0x8b7e07a0, image = PiSmmCpuDxeSmm, guid = EFI_SMM_CPU_PROTOCOL
84 | 0x8b7e7510: addr = 0x8b7e07b0, image = PiSmmCpuDxeSmm, guid = SMM_CPU_SYNC_PROTOCOL
85 | 0x8b7e7410: addr = 0x8b7e07c8, image = PiSmmCpuDxeSmm, guid = SMM_CPU_SYNC2_PROTOCOL
86 | 0x8b7e7310: addr = 0x8b7df5a0, image = PiSmmCpuDxeSmm, guid = EFI_SMM_CPU_SERVICE_PROTOCOL
87 | 0x8b7e7090: addr = 0x8b7e7140, image = CpuIo2Smm, guid = AMI_SMBUS_SMM_PROTOCOL
88 | 0x8b797f90: addr = 0x8b7a5928, image = CryptoSMM, guid = AMI_SMM_DIGITAL_SIGNATURE_PROTOCOL
89 | 0x8b797e10: addr = 0x8b793980, image = S3SaveSmm, guid = EFI_S3_SMM_SAVE_STATE_PROTOCOL
90 | 0x8b797910: addr = 0x8b797820, image = S3SaveSmm, guid = PCH_SPI_PROTOCOL
91 | 0x8b797510: addr = 0x8b76d478, image = PchSmiDispatcher, guid = EFI_SMM_USB_DISPATCH2_PROTOCOL
92 | 0x8b797410: addr = 0x8b76d4b0, image = PchSmiDispatcher, guid = EFI_SMM_SX_DISPATCH2_PROTOCOL
93 | 0x8b797310: addr = 0x8b76d4e8, image = PchSmiDispatcher, guid = EFI_SMM_SW_DISPATCH2_PROTOCOL
94 | 0x8b797210: addr = 0x8b76d520, image = PchSmiDispatcher, guid = EFI_SMM_GPI_DISPATCH2_PROTOCOL
95 | 0x8b797110: addr = 0x8b76d558, image = PchSmiDispatcher, guid = EFI_SMM_POWER_BUTTON_DISPATCH2_PROTOCOL
96 | 0x8b797010: addr = 0x8b76d590, image = PchSmiDispatcher, guid = EFI_SMM_PERIODIC_TIMER_DISPATCH2_PROTOCOL
97 | 0x8b76cf10: addr = 0x8b76e340, image = PchSmiDispatcher, guid = PCH_TCO_SMI_DISPATCH_PROTOCOL
98 | 0x8b76cd90: addr = 0x8b76e390, image = PchSmiDispatcher, guid = PCH_PCIE_SMI_DISPATCH_PROTOCOL
99 | 0x8b76cc90: addr = 0x8b76e3b8, image = PchSmiDispatcher, guid = PCH_ACPI_SMI_DISPATCH_PROTOCOL
100 | 0x8b76cb90: addr = 0x8b76e3e8, image = PchSmiDispatcher, guid = PCH_GPIO_UNLOCK_SMI_DISPATCH_PROTOCOL
101 | 0x8b76ca90: addr = 0x8b76e400, image = PchSmiDispatcher, guid = E6A81BBF-873D-47FD-B6BE61B3E5720993
102 | 0x8b76c990: addr = 0x8b7745b0, image = PchSmiDispatcher, guid = EFI_SMM_IO_TRAP_DISPATCH2_PROTOCOL
103 | 0x8b76c890: addr = 0x8b774608, image = PchSmiDispatcher, guid = PCH_SMM_IO_TRAP_CONTROL_PROTOCOL
104 | 0x8b76c790: addr = 0x8b76e7b0, image = PchSmiDispatcher, guid = PCH_ESPI_SMI_DISPATCH_PROTOCOL
105 | 0x8b76c610: addr = 0x8b76e6a0, image = PchSmiDispatcher, guid = 6906E93B-603B-4A0F-8692832004AAF2DB
106 | 0x8b74c310: addr = 0x8b73eb58, image = AcpiModeEnable, guid = EFI_ACPI_EN_DISPATCH_PROTOCOL
107 | 0x8b74c110: addr = 0x8b73eb68, image = AcpiModeEnable, guid = EFI_ACPI_DIS_DISPATCH_PROTOCOL
108 | 0x8b73dc90: addr = 0x8b73df60, image = SmramSaveInfoHandlerSmm, guid = EFI_EC_ACCESS_PROTOCOL
109 | 0x8b73d690: addr = 0x8b736760, image = PttWrapper, guid = EFI_SMM_VARIABLE_PROTOCOL
110 | 0x8b727f90: addr = 0x8b73d010, image = SmramSaveInfoHandlerSmm, guid = EFI_SMM_CMOS_ACCESS
111 | 0x8b727690: addr = 0x8b723210, image = KbcEmul, guid = EFI_EMUL6064MSINPUT_PROTOCOL
112 | 0x8b727590: addr = 0x8b723280, image = KbcEmul, guid = EFI_EMUL6064KBDINPUT_PROTOCOL
113 | 0x8b727390: addr = 0x8b71f998, image = KbcEmul, guid = EFI_EMUL6064TRAP_PROTOCOL
114 | 0x8b727010: addr = 0x8b71e290, image = NvmeSmm, guid = B91547F5-4D24-4EEF-850774DDABEB71AD
115 | 0x8b709a10: addr = 0x8b702408, image = UsbRt, guid = AMI_USB_SMM_PROTOCOL
116 |
117 | [+] Found DBRC structure at offset 0x2bf110
118 |
119 | SW SMI HANDLERS:
120 |
121 | 0x8b76c410: SMI = 0x56, addr = 0x8b76ab1c, image = CpuSpSMI
122 | 0x8b76c310: SMI = 0x57, addr = 0x8b76ac90, image = CpuSpSMI
123 | 0x8b76c110: SMI = 0x01, addr = 0x8b75153c, image = PiSmmCommunicationSmm
124 | 0x8b76c010: SMI = 0xb0, addr = 0x8b74ded4, image = NbSmi *
125 | 0x8b74c210: SMI = 0xa0, addr = 0x8b73ef80, image = AcpiModeEnable
126 | 0x8b74c010: SMI = 0xa1, addr = 0x8b73f06c, image = AcpiModeEnable
127 | 0x8b73dd10: SMI = 0x55, addr = 0x8b73c4f0, image = SmramSaveInfoHandlerSmm
128 | 0x8b73d310: SMI = 0xd6, addr = 0x8b72c990, image = BootScriptHideSmm
129 | 0x8b73d210: SMI = 0xd7, addr = 0x8b72cb20, image = BootScriptHideSmm
130 | 0x8b727e10: SMI = 0x61, addr = 0x8b729014, image = CmosSmm
131 | 0x8b727a10: SMI = 0xd1, addr = 0x8b72523c, image = SmmHddSecurity
132 | 0x8b727910: SMI = 0xd3, addr = 0x8b725528, image = SmmHddSecurity
133 | 0x8b727110: SMI = 0x42, addr = 0x8b71ce40, image = NvmeSmm
134 | 0x8b709d10: SMI = 0x40, addr = 0x8b706c94, image = SdioSmm
135 | 0x8b709b10: SMI = 0x35, addr = 0x8b705100, image = TcgSmm
136 | 0x8b709810: SMI = 0x31, addr = 0x8b6ecb7c, image = UsbRt
137 | 0x8b709510: SMI = 0xbf, addr = 0x8b6e9d94, image = CrbSmi
138 | 0x8b709210: SMI = 0xef, addr = 0x8b6e4d90, image = ItkSmmVars *
139 | 0x8b709110: SMI = 0x44, addr = 0x8b6e4d90, image = ItkSmmVars *
140 | 0x8b6de210: SMI = 0x59, addr = 0x8b6c0ee8, image = PowerMgmtSmm
141 | 0x8b6bff10: SMI = 0x27, addr = 0x8b6c0c2c, image = PowerMgmtSmm
142 | 0x8b6bfe10: SMI = 0x28, addr = 0x8b6c0dac, image = PowerMgmtSmm
143 |
144 | [+] Found smih structure of root SMI handler at offset 0x2de510
145 |
146 | ROOT SMI HANDLERS:
147 |
148 | 0x8b6de510: addr = 0x8b6c0ae8, image = PowerMgmtSmm
149 | 0x8b797750: addr = 0x8b76fbdc, image = PchSmiDispatcher
150 | 0x8b76c550: addr = 0x8b74e040, image = NbSmi
151 |
152 | [+] Found smie structure at offset 0x2de790
153 |
154 | SMI HANDLERS:
155 |
156 | 0x8b6de790: guid = 29C31B9F-D2B9-4900-BD2A584F2912E386
157 | 0x8b709710: addr = 0x8b6d991c, image = NvramSmi
158 |
159 | 0x8b7f9d90: guid = EFI_END_OF_DXE_EVENT_GROUP
160 | 0x8b7f9e50: addr = 0x8b7fab8c, image = PiSmmCore
161 |
162 | 0x8b797b90: guid = EFI_SMM_LOCK_BOX_COMMUNICATION
163 | 0x8b797e90: addr = 0x8b790648, image = SmmLockBox
164 |
165 | 0x8b727c90: guid = EEDCF975-4DD3-4D94-96FFAACA8353B87B
166 | 0x8b73d590: addr = 0x8b7250a4, image = SmmHddSecurity
167 |
168 | 0x8b727b90: guid = C2B1E795-F9C5-4829-8A42C0B3FE571517
169 | 0x8b727c50: addr = 0x8b72544c, image = SmmHddSecurity
170 |
171 | 0x8b727b10: guid = 60B0760C-7D1B-43F3-95256077BE4137E2
172 | 0x8b727c10: addr = 0x8b72558c, image = SmmHddSecurity
173 |
174 | 0x8b727810: guid = 3FB7E17F-1172-4E2A-9A25BA5FE62CC7C8
175 | 0x8b7278d0: addr = 0x8b7255cc, image = SmmHddSecurity
176 |
177 | 0x8b727790: guid = B3F096E9-2D46-4E8E-A22C7DE8B16B3A5B
178 | 0x8b727890: addr = 0x8b725664, image = SmmHddSecurity
179 |
180 | 0x8b727090: guid = EC2BD1FD-E3B0-429B-ADDF9657935A3684
181 | 0x8b727290: addr = 0x8b71cb94, image = NvmeSmm
182 |
183 | 0x8b709e10: guid = 17D6D323-43CE-438A-BC9578A2DE9919D7
184 | 0x8b709f10: addr = 0x8b706a1c, image = SdioSmm
185 |
186 |
187 | NOTES:
188 |
189 | * - SW SMI handler uses ReadSaveState()/WriteSaveState()
190 |
191 |
--------------------------------------------------------------------------------
/LICENSE.TXT:
--------------------------------------------------------------------------------
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--------------------------------------------------------------------------------
/README.TXT:
--------------------------------------------------------------------------------
1 |
2 | System Management RAM analysis tool.
3 |
4 | **************************************************************************
5 |
6 | For more information about this project please read the following article:
7 |
8 | http://blog.cr4.sh/2016/10/exploiting-ami-aptio-firmware.html
9 |
10 |
11 | To use full capabilities of this tool you need to install UEFIDump (https://github.com/LongSoft/UEFITool/releases/tag/A32), ida-efiutils (https://github.com/snare/ida-efiutils) and edit corresponding variables in smram_parse.py code.
12 |
13 | This tool was tested only with 6 generation Intel NUC firmware based on AMI Aptio V code base.
14 |
15 |
16 | FEATURES:
17 |
18 | * SMRAM and SMST address information
19 | * Loaded SMM drivers list
20 | * SMM protocols list
21 | * SMI entry address for each CPU
22 | * SW SMI handlers list
23 | * Root SmiHandlerRegister() handlers list
24 | * Child SmiHandlerRegister() handlers list
25 |
26 |
27 | USAGE:
28 |
29 | $ smram_parse.py [flash_image_dump]
30 |
31 | Output example: https://raw.githubusercontent.com/Cr4sh/smram_parse/master/EXAMPLE.TXT
32 |
33 |
34 | Written by:
35 | Dmytro Oleksiuk (aka Cr4sh)
36 |
37 | cr4sh0@gmail.com
38 | http://blog.cr4.sh
39 |
40 |
--------------------------------------------------------------------------------
/smram_parse.py:
--------------------------------------------------------------------------------
1 | import sys, os, time, re, shutil
2 | from struct import unpack
3 |
4 | SMRAM_SIZE = 0x800000
5 |
6 | EFI_SMM_CPU_PROTOCOL_GUID = '\x97\x6B\x34\xEB\x5F\x97\x9F\x4A\x8B\x22\xF8\xE9\x2B\xB3\xD5\x69'
7 |
8 | UEFIDUMP_PATH = '/Users/d_olex/_tmp/UEFIDump'
9 | UEFIDUMP_URL = 'https://github.com/LongSoft/UEFITool/releases/tag/NE.A30'
10 |
11 | EFIUTILS_PATH = '/Users/d_olex/ida-efiutils'
12 | EFIUTILS_URL = 'https://github.com/snare/ida-efiutils'
13 |
14 | sys.path.append(EFIUTILS_PATH)
15 |
16 | # PE format constants
17 | HEADERS_SIZE = 0x400
18 | IMAGE_DOS_HEADER_e_lfanew = 0x3c
19 | IMAGE_NT_HEADERS64_OptionalHeader = 0x18
20 | IMAGE_OPTIONAL_HEADER64_SizeOfCode = 0x04
21 | IMAGE_OPTIONAL_HEADER64_SizeOfInitializedData = 0x08
22 | IMAGE_OPTIONAL_HEADER64_AddressOfEntryPoint = 0x10
23 | IMAGE_OPTIONAL_HEADER64_SizeOfImage = 0x38
24 |
25 | MAX_IMAGE_SIZE = 0x100000
26 | PAGE_SIZE = 0x1000
27 |
28 | # helper functions for EFI_GUID
29 | guid_parse = lambda data: unpack('=IHHBBBBBBBB', data)
30 | guid_str = lambda guid: '%.8X-%.4X-%.4X-%.2X%.2X%.2X%.2X%.2X%.2X%.2X%.2X' % guid
31 |
32 | _align = lambda val: '%s' % val
33 |
34 | # EFI_GUID values not included into ida-efiutils
35 | GUIDs = {
36 |
37 | 'SMM_CPU_SYNC_PROTOCOL_GUID': [0xd5950985, 0x8be3, 0x4b1c, 0xb6, 0x3f, 0x95, 0xd1, 0x5a, 0xb3, 0xb6, 0x5f],
38 | 'SMM_CPU_SYNC2_PROTOCOL_GUID': [0x9db72e22, 0x9262, 0x4a18, 0x8f, 0xe0, 0x85, 0xe0, 0x3d, 0xfa, 0x96, 0x73],
39 | 'EFI_SMM_CPU_SERVICE_PROTOCOL_GUID': [0x1d202cab, 0xc8ab, 0x4d5c, 0x94, 0xf7, 0x3c, 0xfc, 0xc0, 0xd3, 0xd3, 0x35],
40 | 'PCH_SPI_PROTOCOL': [0x56521f06, 0x0a62, 0x4822, 0x99, 0x63, 0xdf, 0x01, 0x9d, 0x72, 0xc7, 0xe1],
41 | 'PCH_TCO_SMI_DISPATCH_PROTOCOL_GUID': [0x9e71d609, 0x6d24, 0x47fd, 0xb5, 0x72, 0x61, 0x40, 0xf8, 0xd9, 0xc2, 0xa4],
42 | 'PCH_PCIE_SMI_DISPATCH_PROTOCOL_GUID': [0x3e7d2b56, 0x3f47, 0x42aa, 0x8f, 0x6b, 0x22, 0xf5, 0x19, 0x81, 0x8d, 0xab],
43 | 'PCH_ACPI_SMI_DISPATCH_PROTOCOL_GUID': [0xd52bb262, 0xf022, 0x49ec, 0x86, 0xd2, 0x7a, 0x29, 0x3a, 0x7a, 0x05, 0x4b],
44 | 'PCH_GPIO_UNLOCK_SMI_DISPATCH_PROTOCOL_GUID': [0x83339ef7, 0x9392, 0x4716, 0x8d, 0x3a, 0xd1, 0xfc, 0x67, 0xcd, 0x55, 0xdb],
45 | 'PCH_SMM_IO_TRAP_CONTROL_PROTOCOL': [0x514d2afd, 0x2096, 0x4283, 0x9d, 0xa6, 0x70, 0x0c, 0xd2, 0x7d, 0xc7, 0xa5],
46 | 'PCH_ESPI_SMI_DISPATCH_PROTOCOL_GUID': [0xB3C14FF3, 0xBAE8, 0x456C, 0x86, 0x31, 0x27, 0xFE, 0x0C, 0xEB, 0x34, 0x0C],
47 | 'EFI_ACPI_EN_DISPATCH_PROTOCOL_GUID': [0xbd88ec68, 0xebe4, 0x4f7b, 0x93, 0x5a, 0x4f, 0x66, 0x66, 0x42, 0xe7, 0x5f],
48 | 'EFI_EC_ACCESS_PROTOCOL_GUID': [0x70eeecbe, 0x727a, 0x4244, 0x90, 0x4c, 0xdb, 0x6b, 0xf0, 0x05, 0x53, 0x92],
49 | 'EFI_ACPI_EN_DISPATCH_PROTOCOL_GUID': [0xbd88ec68, 0xebe4, 0x4f7b, 0x93, 0x5a, 0x4f, 0x66, 0x66, 0x42, 0xe7, 0x5f],
50 | 'EFI_ACPI_DIS_DISPATCH_PROTOCOL_GUID': [0x9c939ba6, 0x1fcc, 0x46f6, 0xb4, 0xe1, 0x10, 0x2d, 0xbe, 0x18, 0x65, 0x67]
51 | }
52 |
53 | class FwImage(object):
54 |
55 | def __init__(self, path = None):
56 |
57 | self.data = {}
58 |
59 | if path is not None:
60 |
61 | if os.path.isdir(path):
62 |
63 | self.data = self.scan_dir(path)
64 |
65 | elif os.path.isfile(path):
66 |
67 | self.data = self.scan_file(path)
68 |
69 | def scan_dir(self, path):
70 |
71 | ret = {}
72 |
73 | for fname in os.listdir(path):
74 |
75 | # check for PE image file
76 | m = re.match('Section_PE32_image_\w{8}_\w{4}_\w{4}_\w{4}_\w{12}_(\w+)_body.bin', fname)
77 | if m:
78 |
79 | image_name = m.group(1).strip()
80 | if len(image_name) == 0: continue
81 |
82 | # read file contents
83 | fpath = os.path.join(path, fname)
84 | fdata = open(fpath, 'rb').read(HEADERS_SIZE)
85 |
86 | # use image info as key and image name as value
87 | ret.update([( self.image_info(fdata), image_name )])
88 |
89 | return ret
90 |
91 | def scan_file(self, path):
92 |
93 | dir_name = os.path.dirname(path)
94 | temp_name = 'fw_image_%d' % int(time.time())
95 | temp_path = os.path.join(dir_name, temp_name)
96 |
97 | print('[+] Copying "%s" to "%s"...' % (path, temp_path))
98 |
99 | # copy firmware image to temporary file
100 | shutil.copyfile(path, temp_path)
101 |
102 | print('[+] Unpacking "%s"...\n' % temp_path)
103 |
104 | # extract image contents
105 | code = os.system('"%s" "%s"' % (UEFIDUMP_PATH, temp_path))
106 | if code != 0:
107 |
108 | print('WARNING: Error while running %s' % UEFIDUMP_PATH)
109 | print('You can download UEFIDump here: %s\n' % UEFIDUMP_URL)
110 | return {}
111 |
112 | else:
113 |
114 | print('')
115 |
116 | # scan contents for PE files
117 | dump_path = temp_path + '.dump'
118 | ret = self.scan_dir(dump_path)
119 |
120 | # cleanup
121 | shutil.rmtree(dump_path)
122 | os.unlink(temp_path)
123 |
124 | return ret
125 |
126 | def image_info(self, data):
127 |
128 | # read e_lfanew field
129 | offset = unpack('I', data[IMAGE_DOS_HEADER_e_lfanew : \
130 | IMAGE_DOS_HEADER_e_lfanew + 4])[0]
131 |
132 | offset += IMAGE_NT_HEADERS64_OptionalHeader
133 |
134 | get_field = lambda field: \
135 | unpack('I', data[offset + field : offset + field + 4])[0]
136 |
137 | # read optional header fields and use them to identify an image
138 | return ( get_field(IMAGE_OPTIONAL_HEADER64_SizeOfCode),
139 | get_field(IMAGE_OPTIONAL_HEADER64_SizeOfInitializedData),
140 | get_field(IMAGE_OPTIONAL_HEADER64_AddressOfEntryPoint),
141 | get_field(IMAGE_OPTIONAL_HEADER64_SizeOfImage) )
142 |
143 | def image_name(self, data):
144 |
145 | try:
146 |
147 | # find image name by image info
148 | return self.data[self.image_info(data)]
149 |
150 | except KeyError:
151 |
152 | return None
153 |
154 | class GuidDb(object):
155 |
156 | def __init__(self, guids = None):
157 |
158 | self.guids = {}
159 |
160 | try:
161 |
162 | import efiguids
163 | self.load(efiguids.GUIDs)
164 |
165 | except ImportError: pass
166 |
167 | try:
168 |
169 | import efiguids_ami
170 | self.load(efiguids_ami.GUIDs)
171 |
172 | except ImportError: pass
173 |
174 | if len(self.guids) == 0:
175 |
176 | print('Error while loading GUIDs from %s' % EFIUTILS_PATH)
177 | print('You can download ida-efiutils here: %s\n' % EFIUTILS_URL)
178 |
179 | if guids is not None: self.load(guids)
180 |
181 | def load(self, guids):
182 |
183 | _name = lambda n: n[:-5] if n[-5:] == '_GUID' else n
184 |
185 | # load GUID's database from ida-efiutils
186 | self.guids.update(map(lambda it: ( guid_str(tuple(it[1])), \
187 | _name(it[0]) ), guids.items()))
188 |
189 | def lookup(self, guid):
190 |
191 | # get name by GUID
192 | try: return self.guids[guid_str(guid)]
193 | except KeyError: return None
194 |
195 | class Dumper(object):
196 |
197 | # helper functions for SMRAM dump
198 | in_smram = lambda self, addr: addr >= self.smram and addr < self.smram + self.smram_size
199 | to_offset = lambda self, addr: addr - self.smram
200 | from_offset = lambda self, offset: offset + self.smram
201 |
202 | has_guid = lambda self, addr, guid: self.data[self.to_offset(addr) : \
203 | self.to_offset(addr) + self.image_size(addr)].find(guid) \
204 | != -1
205 |
206 | def __init__(self, smram_dump, fw_image = None, smram_base = None, smram_size = None):
207 |
208 | self.data = open(smram_dump, 'rb').read()
209 |
210 | # parse firmware image
211 | self.fw = FwImage(fw_image)
212 |
213 | # load EFI_GUID database
214 | self.guids = GuidDb(guids = GUIDs)
215 |
216 | if smram_base is None:
217 |
218 | self.smram = unpack('Q', self.data[0x10 : 0x18])[0] & 0xff400000
219 |
220 | else:
221 |
222 | self.smram = smram_base
223 |
224 | if smram_size is None:
225 |
226 | self.smram_size = SMRAM_SIZE
227 |
228 | else:
229 |
230 | self.smram_size = smram_size
231 |
232 | print('[+] SMRAM is at 0x%x:%x' % (self.smram, self.smram + self.smram_size - 1))
233 |
234 | # get image base by address inside of it
235 | def image_by_addr(self, addr):
236 |
237 | offset = self.to_offset(addr)
238 | ptr = offset & 0xfffffff0
239 |
240 | while offset - ptr < MAX_IMAGE_SIZE:
241 |
242 | # check for IMAGE_DOS_HEADER signature
243 | if self.data[ptr : ptr + 2] == 'MZ':
244 |
245 | # read e_lfanew field
246 | e_lfanew = unpack('I', self.data[ptr + IMAGE_DOS_HEADER_e_lfanew : \
247 | ptr + IMAGE_DOS_HEADER_e_lfanew + 4])[0]
248 |
249 | # check for PE image header
250 | if e_lfanew < PAGE_SIZE and self.data[ptr + e_lfanew : ptr + e_lfanew + 2] == 'PE':
251 |
252 | return self.from_offset(ptr)
253 |
254 | ptr -= 0x10
255 |
256 | def image_size(self, addr):
257 |
258 | offset = self.to_offset(self.image_by_addr(addr))
259 |
260 | # read e_lfanew field
261 | offset += unpack('I', self.data[offset + IMAGE_DOS_HEADER_e_lfanew : \
262 | offset + IMAGE_DOS_HEADER_e_lfanew + 4])[0]
263 |
264 | offset += IMAGE_NT_HEADERS64_OptionalHeader + \
265 | IMAGE_OPTIONAL_HEADER64_SizeOfImage
266 |
267 | # read SizeOfImage field
268 | return unpack('I', self.data[offset : offset + 4])[0]
269 |
270 | def image_name(self, addr):
271 |
272 | if addr is None:
273 |
274 | return ''
275 |
276 | offset = self.to_offset(addr)
277 |
278 | return self.fw.image_name(self.data[offset : offset + HEADERS_SIZE])
279 |
280 | def dump_smst(self):
281 |
282 | # check for EFI_SMM_SYSTEM_TABLE signature
283 | ptr = self.data.find('SMST\0\0\0\0')
284 | if ptr != -1:
285 |
286 | print('[+] EFI_SMM_SYSTEM_TABLE2 is at 0x%x' % self.from_offset(ptr))
287 |
288 | def dump_images(self):
289 |
290 | print('\nLOADED SMM DRIVERS:\n')
291 |
292 | ptr = 0
293 |
294 | while ptr < len(self.data):
295 |
296 | # check for DOS image header
297 | if self.data[ptr : ptr + 2] == 'MZ':
298 |
299 | # read e_lfanew field
300 | e_lfanew = unpack('I', self.data[ptr + IMAGE_DOS_HEADER_e_lfanew : \
301 | ptr + IMAGE_DOS_HEADER_e_lfanew + 4])[0] + ptr
302 |
303 | # check for PE image header
304 | if self.data[e_lfanew : e_lfanew + 2] == 'PE':
305 |
306 | addr = self.from_offset(ptr)
307 | name = self.image_name(addr)
308 | _, _, entry, size = self.fw.image_info(self.data[ptr : ptr + HEADERS_SIZE])
309 |
310 | print('0x%x: size = 0x%.8x, ep = 0x%x, name = %s' % \
311 | (addr, size, self.from_offset(ptr + entry), \
312 | _align('' if name is None else name)))
313 |
314 | ptr += 0x100
315 |
316 | def dump_smi_entries(self):
317 |
318 | print('\nSMI ENTRIES:\n')
319 |
320 | #
321 | # Standard SMI entry stub signature
322 | #
323 | ptr, num = 0, 0
324 | sig = [ '\xBB', None, '\x80', # mov bx, 80XXh
325 | '\x66', '\x2E', '\xA1', None, '\xFB', # mov eax, cs:dword_FBXX
326 | '\x66', None, None, # mov edx, eax
327 | '\x66', None, None ] # mov ebp, eax
328 |
329 | while ptr < len(self.data):
330 |
331 | found = True
332 | for i in range(len(sig)):
333 |
334 | # check for signature at each 100h offset of SMRAM
335 | if sig[i] is not None and sig[i] != self.data[ptr + i]:
336 |
337 | found = False
338 | break
339 |
340 | if found:
341 |
342 | print('CPU %d: 0x%x' % (num, self.from_offset(ptr)))
343 | num += 1
344 |
345 | ptr += 0x100
346 |
347 | def dump_protocols(self):
348 |
349 | first_entry, ptr = None, 0
350 | parse = lambda offset: unpack('QQ16sQ', self.data[offset : offset + 0x28])
351 |
352 | while ptr < self.smram_size - 0x100:
353 |
354 | # check for 'prte' signature
355 | if self.data[ptr : ptr + 4] == 'prte':
356 |
357 | flink, blink, guid, info = parse(ptr + 8)
358 |
359 | # check for valid protocol structure
360 | if self.in_smram(flink) and self.in_smram(blink) and self.in_smram(info):
361 |
362 | print('\n[+] Found prte structure at offset 0x%x' % ptr)
363 |
364 | first_entry = ptr
365 | break
366 |
367 | ptr += 8
368 |
369 | if first_entry is None:
370 |
371 | print('\nERROR: Unable to find prte entry')
372 | return -1
373 |
374 | print('\nSMM PROTOCOLS:\n')
375 |
376 | entry = first_entry
377 |
378 | # iterate double linked list
379 | while True:
380 |
381 | flink, blink, guid, info = parse(entry + 8)
382 |
383 | # check for valid protocol structure
384 | if not self.in_smram(flink) or not self.in_smram(blink):
385 |
386 | print('ERROR: Invalid prte entry at 0x%x' % entry)
387 | return -1
388 |
389 | # check for protocol information
390 | if self.in_smram(info):
391 |
392 | # get protocol information
393 | offset = self.to_offset(info)
394 | tmp_1, tmp_2, tmp_3, addr = unpack('QQQQ', self.data[offset : offset + 0x20])
395 |
396 | if self.in_smram(tmp_1) and self.in_smram(tmp_2) and \
397 | self.in_smram(tmp_3) and self.in_smram(addr):
398 |
399 | guid = guid_parse(guid)
400 | name = self.guids.lookup(guid)
401 |
402 | # get image information
403 | image = self.image_by_addr(addr)
404 | image_name = self.image_name(image)
405 | image_name = image_name if image_name is not None else '0x%x' % image
406 |
407 | print('0x%x: addr = 0x%x, image = %s, guid = %s' % \
408 | (self.from_offset(entry), addr, _align(image_name),
409 | guid_str(guid) if name is None else name))
410 |
411 | entry = self.to_offset(flink) - 8
412 | if entry == first_entry: break
413 |
414 | def dump_sw_smi_handlers(self):
415 |
416 | first_entry, ptr = None, 0
417 |
418 | default_offs = 0x10
419 | format_offs, format = default_offs, 'QQ%dsQQQ' % default_offs
420 |
421 | parse = lambda offset: unpack(format,
422 | self.data[offset : offset + format_offs + (5 * 8)])
423 |
424 | while ptr < self.smram_size - 0x100:
425 |
426 | # check for 'DBRC' signature
427 | if self.data[ptr : ptr + 4] == 'DBRC':
428 |
429 | flink, blink, _, _, _, _ = parse(ptr + 8)
430 |
431 | # check for valid EFI_LIST_ENTRY and SW SMI handler
432 | if self.in_smram(flink) and self.in_smram(blink):
433 |
434 | print('\n[+] Found DBRC structure at offset 0x%x' % ptr)
435 |
436 | first_entry = ptr
437 | break
438 |
439 | ptr += 8
440 |
441 | if first_entry is None:
442 |
443 | print('\nERROR: Unable to find DBRC entry')
444 | return -1
445 |
446 | print('\nSW SMI HANDLERS:\n')
447 |
448 | entry = first_entry
449 | known_handlers = []
450 |
451 | # iterate double linked list
452 | while True:
453 |
454 | if format_offs == default_offs:
455 |
456 | prev_offs = 0
457 | entry_data = self.data[entry + (8 * 3) : entry + 0x100]
458 |
459 | while True:
460 |
461 | # find offset of 0x504 qword that indicates SW SMI handler type
462 | offs = entry_data.find('\x04\x05\x00\x00\x00\x00\x00\x00')
463 | if offs == -1:
464 |
465 | break
466 |
467 | val = unpack('Q', entry_data[offs + 8 : offs + (8 * 2)])[0]
468 | if self.in_smram(val):
469 |
470 | # update list entry format
471 | offs += prev_offs
472 | format_offs, format = offs, 'QQ%dsQQQ' % offs
473 |
474 | break
475 |
476 | prev_offs += offs + 8
477 | entry_data = entry_data[offs + 8:]
478 |
479 | flink, blink, _, unk, func, smi = parse(entry + 8)
480 |
481 | # check for valid EFI_LIST_ENTRY
482 | if not self.in_smram(flink) or not self.in_smram(blink):
483 |
484 | print('ERROR: Invalid DBRC entry at 0x%x' % entry)
485 | return -1
486 |
487 | # check for SW SMI handler information
488 | if unk == 0x504 and self.in_smram(func) and smi >= 0 and smi <= 255:
489 |
490 | if entry in known_handlers:
491 |
492 | break
493 |
494 | # get image information
495 | image = self.image_by_addr(func)
496 | image_name = self.image_name(image)
497 | uses_cpu_prot = self.has_guid(image, EFI_SMM_CPU_PROTOCOL_GUID)
498 |
499 | print('0x%x: SMI = 0x%.2x, addr = 0x%x, image = %s %s' % \
500 | (self.from_offset(entry), smi, func, \
501 | _align(image_name if image_name is not None else '0x%x' % image), \
502 | '*' if uses_cpu_prot else ''))
503 |
504 | known_handlers.append(entry)
505 |
506 | entry = self.to_offset(flink) - 8
507 | if entry == first_entry: break
508 |
509 | def _dump_handlers(self, head):
510 |
511 | parse = lambda offset: unpack('QQQ', self.data[offset : offset + 0x18])
512 | entry = head
513 |
514 | while True:
515 |
516 | flink, blink, func = parse(entry + 8)
517 |
518 | if self.data[entry : entry + 4] == 'smih':
519 |
520 | image = self.image_by_addr(func)
521 | image_name = self.image_name(image)
522 |
523 | print('0x%x: addr = 0x%x, image = %s' % \
524 | (self.from_offset(entry), func, \
525 | image_name if image_name is not None else '0x%x' % image))
526 |
527 | entry = self.to_offset(flink) - 8
528 | if entry == head: break
529 |
530 | def dump_smi_handlers(self):
531 |
532 | first_entry, ptr = None, 0
533 | parse = lambda offset: unpack('QQ16sQQ', self.data[offset : offset + 0x30])
534 |
535 | while ptr < self.smram_size - 0x100:
536 |
537 | # check for 'smie' signature
538 | if self.data[ptr : ptr + 4] == 'smie':
539 |
540 | flink, blink, guid, h_flink, h_blink = parse(ptr + 8)
541 |
542 | # check for valid EFI_LIST_ENTRY
543 | if self.in_smram(flink) and self.in_smram(blink) and \
544 | self.in_smram(h_flink) and self.in_smram(h_blink):
545 |
546 | print('\n[+] Found smie structure at offset 0x%x' % ptr)
547 |
548 | first_entry = ptr
549 | break
550 |
551 | ptr += 8
552 |
553 | if first_entry is None:
554 |
555 | print('\nERROR: Unable to find smie entry')
556 | return -1
557 |
558 | print('\nSMI HANDLERS:\n')
559 |
560 | entry = first_entry
561 |
562 | # iterate double linked list
563 | while True:
564 |
565 | flink, blink, guid, h_flink, h_blink = parse(entry + 8)
566 |
567 | # check for valid EFI_LIST_ENTRY
568 | if not self.in_smram(flink) or not self.in_smram(blink):
569 |
570 | print('ERROR: Invalid smie entry at 0x%x' % entry)
571 | return -1
572 |
573 | if self.data[entry : entry + 4] == 'smie' and \
574 | self.in_smram(h_flink) and self.in_smram(h_blink):
575 |
576 | guid = guid_parse(guid)
577 | name = self.guids.lookup(guid)
578 |
579 | print('0x%x: guid = %s' % (self.from_offset(entry), \
580 | guid_str(guid) if name is None else name))
581 |
582 | self._dump_handlers(entry + 0x20)
583 |
584 | print('')
585 |
586 | entry = self.to_offset(flink) - 8
587 | if entry == first_entry: break
588 |
589 | def dump_root_smi_handlers(self):
590 |
591 | first_entry, ptr = None, 0
592 | parse = lambda offset: unpack('QQQQ', self.data[offset : offset + 0x20])
593 |
594 | while ptr < self.smram_size - 0x100:
595 |
596 | # check for 'smie' signature
597 | if self.data[ptr : ptr + 4] == 'smih':
598 |
599 | flink, blink, func, entry = parse(ptr + 8)
600 |
601 | # check for valid EFI_LIST_ENTRY
602 | if self.in_smram(flink) and self.in_smram(blink) and \
603 | self.in_smram(func) and entry == 0:
604 |
605 | print('\n[+] Found smih structure of root SMI handler at offset 0x%x' % ptr)
606 |
607 | first_entry = ptr
608 | break
609 |
610 | ptr += 8
611 |
612 | if first_entry is None:
613 |
614 | print('\nERROR: Unable to find smih entry')
615 | return -1
616 |
617 | print('\nROOT SMI HANDLERS:\n')
618 |
619 | self._dump_handlers(first_entry)
620 |
621 | def main():
622 |
623 | if len(sys.argv) <= 1:
624 |
625 | print('USAGE: smram_parse.py [flash_image_dump [SMRAM_base [SMRAM_size]]]')
626 | return 0
627 |
628 | d = Dumper(sys.argv[1], \
629 | fw_image = sys.argv[2] if len(sys.argv) > 2 else None,
630 | smram_base = int(sys.argv[3], 16) if len(sys.argv) > 3 else None,
631 | smram_size = int(sys.argv[4], 16) if len(sys.argv) > 4 else None)
632 |
633 | d.dump_smst()
634 |
635 | # show SMI entries information
636 | d.dump_smi_entries()
637 |
638 | # show loaded images information
639 | d.dump_images()
640 |
641 | # show SMM protocols information
642 | d.dump_protocols()
643 |
644 | # show SMI handlers information
645 | d.dump_sw_smi_handlers()
646 | d.dump_root_smi_handlers()
647 | d.dump_smi_handlers()
648 |
649 | print('\nNOTES:')
650 | print('\n * - SW SMI handler uses ReadSaveState()/WriteSaveState()\n')
651 |
652 | return 0
653 |
654 | if __name__ == '__main__':
655 |
656 | sys.exit(main())
657 |
658 | #
659 | # EoF
660 | #
661 |
--------------------------------------------------------------------------------