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Disclaimer + Proxy + ESC8 without PKINIT + Markdown Fix
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# DISCLAIMER | ||
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The authors and contributors of this repository disclaim any and all responsibility for the misuse of the information, tools, or techniques described herein. The content is provided solely for educational and research purposes. Users are strictly advised to utilize this information in accordance with applicable laws and regulations and only on systems for which they have explicit authorization. | ||
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By accessing and using this repository, you agree to: | ||
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* Refrain from using the provided information for any unethical or illegal activities. | ||
* Ensure that all testing and experimentation are conducted responsibly and with proper authorization. | ||
* Acknowledge that any actions you take based on the contents of this repository are solely your responsibility. | ||
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Neither the authors nor contributors shall be held liable for any damages, direct or indirect, resulting from the misuse or unauthorized application of the knowledge contained herein. Always act mindfully, ethically, and within the boundaries of the law. |
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# Proxy Bypass | ||
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> An HTTP proxy server acts as an intermediary between a client (like a web browser) and a web server. It processes client requests for web resources, fetches them from the destination server, and returns them to the client. | ||
## Summary | ||
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* [Methodology](#methodology) | ||
* [Discover Proxy Configuration](#discover-proxy-configuration) | ||
* [PAC Proxy](#pac-proxy) | ||
* [Common Bypass](#common-bypass) | ||
* [References](#references) | ||
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## Methodology | ||
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### Discover Proxy Configuration | ||
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* Windows, in the registry key `DefaultConnectionSettings` | ||
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```ps1 | ||
Software\Microsoft\Windows\CurrentVersion\Internet Settings\Connections\DefaultConnectionSettings | ||
Software\Microsoft\Windows\CurrentVersion\Internet Settings\ProxyServer | ||
``` | ||
* Windows: | ||
```ps1 | ||
netsh winhttp show proxy | ||
``` | ||
* Linux, in the environment variables `http_proxy` and `https_proxy` | ||
```ps1 | ||
env | ||
cat /etc/profile.d/proxy.conf | ||
``` | ||
### PAC Proxy | ||
PAC (Proxy Auto-Configuration) is a method to automatically determine whether web traffic should go through a proxy server. It uses a .pac file that contains a JavaScript function called `FindProxyForURL(url, host)`. | ||
* proxy.pac | ||
* wpad.dat | ||
**Example**: | ||
```ps1 | ||
function FindProxyForURL(url, host) { | ||
if (dnsDomainIs(host, '.example.com')) { | ||
return 'DIRECT'; | ||
} | ||
return 'PROXY proxy.example.com:8080'; | ||
} | ||
``` | ||
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**Tools**: | ||
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* [PortSwigger - Proxy Auto Config](https://portswigger.net/bappstore/7b3eae07aa724196ab85a8b64cd095d1) - This extension automatically configures Burp upstream proxies to match desktop proxy settings. This includes support for Proxy Auto-Config (PAC) scripts. | ||
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### Common Bypass | ||
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* Try several way to reach the Internet | ||
* IP address | ||
* Domain categorized in Health/Finance | ||
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* Use another proxy reachable in the same environment | ||
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* Weak regular expression for URL can be abused to bypass the proxy configuration | ||
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```ps1 | ||
user:pass@domain/endpoint?parameter#hash | ||
e.g: microsoft.com:[email protected]/microsoft.com?microsoft.com#microsoft.com | ||
``` | ||
* Trusted Websites: [Living Off Trusted Sites (LOTS) Project](https://lots-project.com/) | ||
* Amazon Cloud: AWS endpoints | ||
* Microsoft Cloud: Azure endpoints | ||
* Google Cloud: GCP endpoints | ||
* live.sysinternals.com | ||
* User-Agents | ||
* Tools related User-Agent: curl, python, powershell | ||
```ps1 | ||
User-Agent: curl/8.11.0 | ||
User-Agent: python-requests/2.32.3 | ||
User-Agent: Mozilla/5.0 (Windows NT; Windows NT 10.0; fr-FR) WindowsPowerShell/5.1.26100.2161 | ||
``` | ||
* Platform related User-Agent: Android/iOS/Tablet | ||
```ps1 | ||
Mozilla/5.0 (Linux; Android 14; Pixel 9 Build/AD1A.240905.004; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/129.0.6668.78 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/484.0.0.63.83;IABMV/1;] | ||
Mozilla/5.0 (iPhone; CPU iPhone OS 18_0_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/15E148 [FBAN/FBIOS;FBAV/485.1.0.45.110;FBBV/665337277;FBDV/iPhone17,1;FBMD/iPhone;FBSN/iOS;FBSV/18.0.1;FBSS/3;FBCR/;FBID/phone;FBLC/it_IT;FBOP/80] | ||
``` | ||
* Domain Fronting | ||
* Protocols | ||
* TCP | ||
* Websocket (HTTP) | ||
* DNS Exfiltration | ||
## References | ||
* [Proxy managed by enterprise? No problem! Abusing PAC and the registry to get burpin’ - Thomas Grimée - August 17, 2021](https://blog.nviso.eu/2021/08/17/proxy-managed-by-enterprise-no-problem-abusing-pac-and-the-registry-to-get-burpin/) | ||
* [Proxy: Internal Proxy - MITRE ATT&CK - March 14, 2020](https://attack.mitre.org/versions/v16/techniques/T1090/001/) |