surf - Escalate your SSRF vulnerabilities on Modern Cloud

项目说明

Surf - Escalate your SSRF on Modern Cloud En

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surf allows you to filter a list of hosts, returning a list of SSRF candidates. It does this by sending a HTTP request from your machine to each host, collecting all the hosts that did not respond, and then filtering them into a list of externally facing and internally facing hosts.

You can then attempt these hosts wherever an SSRF may be present. Due to most SSRF filters only focusing on internal or restricted IP ranges, you'll be pleasantly surprised when you get SSRF on an external IP that is not accessible via HTTP(s) from your machine.

Often you will find that large companies with cloud en will ha IPs for internal web apps. Traditional SSRF filters will not capture this unless these hosts are specifically added to a blacklist (which they usually never are). This is why this technique can be so powerful.

Installation

This tool requires go 1.19 or above as we rely on httpx to do the HTTP probing.

It can be installed with the following command:

Usage

Consider that you ha for bigcorp.com inside a file named bigcorp.txt, and you want to find all the SSRF candidates for these subdomains. Here are some examples:

The full list of settings can be found below:

Output

When running surf, it will print out the SSRF candidates to stdout, but it will also save two files inside the folder it is ran from:

These two files will contain the list of hosts that are ideal SSRF candidates to try on your target. The external target list has higher chances of being than the internal list.

Acknowledgements

Under the hood, this tool le httpx to do the HTTP probing. It captures errors returned from httpx, and then performs some basic analysis to determine the most candidates for SSRF.

This tool was created as a result of a li event for HackerOne (H1-4420 2023).

项目信息

开发语言：Go

Star 数：756

技术要点

该项目属于漏洞知识库方向的开源资源，代码结构清晰，适合安全研究人员学习参考。项目围绕Escalate your SSRF vulnerabilities on Modern Cloud Environments. `surf` allows you to filter a list of hosts, returning a list of viable SSRF candidates.展开，提供了可运行的实现，对理解相关安全机制、工具原理与攻防技术具有较高的研究价值。

从技术实现角度看，此类项目的核心在于对底层原理的深入理解与工程化落地。开发者在研究过程中可以结合官方文档与社区讨论，梳理项目的初始化流程、核心模块职责与数据流转，逐步掌握其中的技术细节与设计思路。

使用与学习建议

1. 下载源码压缩包，解压到本地环境。

2. 根据项目类型准备对应的运行环境与依赖。

3. 按照 README 中的步骤完成配置与部署。

4. 在隔离的测试环境中运行验证，避免影响生产系统。

免责声明

本资源来源于开源社区，仅供安全研究、技术学习与合法授权范围内的攻防演练使用，请勿用于任何非法或侵害他人权益的用途。使用本项目产生的一切后果由使用者自行承担。