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< ul > < details id = enumeration ontoggle = "linkClick(this); return false;" > < summary > Enumeration< / summary > < ul > < details id = containers ontoggle = "linkClick(this); return false;" > < summary > Containers< / summary > < ul > < / ul > < / details > < details id = docs ontoggle = "linkClick(this); return false;" > < summary > Docs< / summary > < ul > < li > < a href = "/enumeration/docs/aws.html" > aws< / a > < / li > < li > < a href = "/enumeration/docs/cewl.html" > cewl< / a > < / li > < li > < a href = "/enumeration/docs/dns.html" > dns< / a > < / li > < li > < a href = "/enumeration/docs/docker_enumeration.html" > docker_enumeration< / a > < / li > < li > < a href = "/enumeration/docs/ffuf.html" > ffuf< / a > < / li > < li > < a href = "/enumeration/docs/gobuster.html" > gobuster< / a > < / li > < li > < a href = "/enumeration/docs/kerberoast.html" > kerberoast< / a > < / li > < li > < a href = "/enumeration/docs/kubectl.html" > kubectl< / a > < / li > < li > < a href = "/enumeration/docs/ldap.html" > ldap< / a > < / li > < li > < a href = "/enumeration/docs/linux_basics.html" > linux_basics< / a > < / li > < li > < a href = "/enumeration/docs/microk8s.html" > microk8s< / a > < / li > < li > < a href = "/enumeration/docs/nfs.html" > nfs< / a > < / li > < li > < a href = "/enumeration/docs/nikto.html" > nikto< / a > < / li > < li > < a href = "/enumeration/docs/nmap.html" > nmap< / a > < / li > < li > < a href = "/enumeration/docs/port_knocking.html" > port_knocking< / a > < / li > < li > < a href = "/enumeration/docs/rpcclient.html" > rpcclient< / a > < / li > < li > < a href = "/enumeration/docs/rsync.html" > rsync< / a > < / li > < li > < a href = "/enumeration/docs/rustscan.html" > rustscan< / a > < / li > < li > < a href = "/enumeration/docs/shodan.html" > shodan< / a > < / li > < details id = snmp ontoggle = "linkClick(this); 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< ul >
< li > < a href = "#cve-2021-1675-printnightmare-lpe-powershell" > CVE-2021-1675 - PrintNightmare LPE (PowerShell)< / a > < ul >
< li > < a href = "#usage" > Usage< / a > < / li >
< li > < a href = "#details" > Details< / a > < / li >
< / ul >
< / li >
< / ul >
< / div >
< h1 id = "cve-2021-1675-printnightmare-lpe-powershell" > CVE-2021-1675 - PrintNightmare LPE (PowerShell)< / h1 >
< blockquote >
< p > Caleb Stewart | John Hammond | July 1, 2021< / p >
< / blockquote >
< hr / >
< p > < a href = "https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-1675" > CVE-2021-1675< / a > is a critical remote code execution and local privilege escalation vulnerability dubbed "PrintNightmare."< / p >
< p > Proof-of-concept exploits have been released (< a href = "https://github.com/cube0x0/CVE-2021-1675/blob/main/CVE-2021-1675.py" > Python< / a > , < a href = "https://github.com/afwu/PrintNightmare/blob/main/EXP/POC/POC.cpp" > C++< / a > ) for the remote code execution capability, and a < a href = "https://github.com/cube0x0/CVE-2021-1675/tree/main/SharpPrintNightmare" > C# rendition< / a > for local privilege escalation. We had not seen a native implementation in pure PowerShell, and we wanted to try our hand at refining and recrafting the exploit.< / p >
< p > This PowerShell script performs local privilege escalation (LPE) with the PrintNightmare attack technique.< / p >
< p > < img alt = "image" src = "https://user-images.githubusercontent.com/6288722/124203761-70b36580-daab-11eb-8520-7d93743062af.png" / > < / p >
< p > This has been tested on Windows Server 2016 and Windows Server 2019.< / p >
< h2 id = "usage" > Usage< / h2 >
< p > Add a new user to the local administrators group by default:< / p >
< div class = "codehilite" > < pre > < span > < / span > < code > Import-Module .< span class = "se" > \c< / span > ve-2021-1675.ps1
Invoke-Nightmare < span class = "c1" > # add user `adm1n`/`P@ssw0rd` in the local admin group by default< / span >
Invoke-Nightmare -DriverName < span class = "s2" > " Xerox" < / span > -NewUser < span class = "s2" > " john" < / span > -NewPassword < span class = "s2" > " SuperSecure" < / span >
< / code > < / pre > < / div >
< p > Supply a custom DLL payload, to do anything else you might like.< / p >
< div class = "codehilite" > < pre > < span > < / span > < code > Import-Module .< span class = "se" > \c< / span > ve-2021-1675.ps1
Invoke-Nightmare -DLL < span class = "s2" > " C:\absolute\path\to\your\bindshell.dll" < / span >
< / code > < / pre > < / div >
< h2 id = "details" > Details< / h2 >
< ul >
< li > The LPE technique does not need to work with remote RPC or SMB, as it is only working with the functions of Print Spooler.< / li >
< li > This script embeds a Base64-encoded GZIPped payload for a custom DLL, that is patched according to your arguments, to easily add a new user to the local administrators group.< / li >
< li > This script embeds methods from PowerSploit/< a href = "https://github.com/PowerShellMafia/PowerSploit/blob/master/Privesc/PowerUp.ps1" > PowerUp< / a > to reflectively access the Win32 APIs.< / li >
< li > This method does not loop through all printer drivers to find the appropriate DLL path -- it simply grabs the first driver and determines the appropriate path.< / li >
< / ul >
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© Stefan Friese
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