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SKILL verified MIT Self-run

Ssrf Internal Network

skill-zhaji2333-ckskills-ssrf-internal-network · by zhaji2333

当发现URL参数可控的抓取/代理/转发/爬虫/文档预览/图片预览/二维码/短链/Webhook/回调/在线解压等功能时调用。负责SSRF探测、云元数据利用、内网资产发现、DNS重绑定、协议绕过(file/gopher/dict)、Redis等内网服务攻击。

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Install

$ agentstack add skill-zhaji2333-ckskills-ssrf-internal-network

✓ scanned · ✓ verified, works with Claude Code, Cursor, and more.

Security review

✓ Passed

No issues found. Passed automated security review. · v0.1.0 How review works →

  • Prompt-injection patterns
  • Secret / credential exfiltration
  • Dangerous shell & filesystem operations
  • Untrusted network calls
  • Known-malicious package signatures

What it can access

  • Network access No
  • Filesystem access No
  • Shell / process execution No
  • Environment & secrets No
  • Dynamic code execution No

From automated source analysis of v0.1.0. “Used” means the capability is present in the source — more access means more to trust, not that it’s unsafe.

View the full security report →

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Reliability & compatibility

Security review passed
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Declared compatibility

Claude CodeClaude Desktop

Compatibility is declared by the source manifest. End-to-end runtime verification is coming, see below.

Preview Execution monitoring

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How agent discovery & health will work →
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About

ssrf-internal-network — SSRF 与内网横向专项深度挖掘

何时调用(触发条件)

  • 请求中存在 URL 参数(url、link、img、redirect、callback、webhook、notify_url)
  • 服务端抓取/代理/转发功能(爬虫、采集、预览、转码)
  • 回调类功能(支付回调、Webhook 配置、回调验证)
  • 二维码/短链生成、在线解压(远程 URL)
  • 图片/文档/音视频在线预览

一、SSRF 场景清单

| 场景 | 漏洞类型 | 挖掘要点 | |---|---|---| | 二维码生成 | SSRF/XSS/钓鱼 | URL参数可控、二维码内容可控 | | 短链服务 | 重定向/SSRF/遍历 | 短链可预测、目标URL可控 | | 代理/转发服务 | SSRF/内网穿透 | 目标地址可控、协议可控 | | 爬虫/采集功能 | SSRF/RCE | 采集URL可控、解析引擎漏洞 | | 在线预览(文档/代码) | SSRF/XSS/RCE | 远程URL加载、渲染引擎漏洞 | | 模板/报表生成 | SSTI/任意文件读取 | 用户输入进入模板引擎 | | Webhook/回调配置 | SSRF/信息泄露 | 回调URL可控、内网探测 | | 文件预览(PDF/Office) | SSRF/XXE/RCE | 远程URL加载、OLE对象 | | 图片处理 | SSRF | url:协议(ImageMagick) | | 视频/音频处理 | SSRF/文件读取 | concat协议、HLS playlist(FFmpeg) |

二、云元数据(打内网核心)

AWS:     http://169.254.169.254/latest/meta-data/
阿里云:  http://100.100.100.200/latest/meta-data/
腾讯云:  http://metadata.tencentyun.com/latest/meta-data/

目标:获取临时凭证(IAM Role)、实例元数据、网络配置,进一步接管云资产。

三、内网探测思路

  1. 先验证可控性:请求外网可控地址(Burp Collaborator / DNSLog / 自己的 VPS)确认请求发出
  2. 内网网段探测:扫描 127.0.0.1、10.x、172.16-31.x、192.168.x 常见端口
  3. Redis 未授权gopher:// 写入 crontab/SSH key/主从复制 RCE
  4. 管理面板:内网 Jenkins/ES/Grafana/MySQL 等
  5. 协议利用

`` file:///etc/passwd gopher://127.0.0.1:6379/_ dict://127.0.0.1:6379/info ``

  1. DNS 重绑定:注册域名解析到 127.0.0.1/内网 IP,绕过 IP 校验
  2. 重定向绕过:302 跳转至内网/云元数据,绕过 URL 白名单

四、绕过技术

  • IP 混淆:十进制/十六进制/八进制(21307064330x7f0000010177.0.0.1
  • 短域名/URL 解析差异(http://127.0.0.1@evil.com
  • 重定向(http://evil.com/redirect?to=169.254.169.254
  • DNS 重绑定
  • 编码(双重 URL 编码、Unicode)
  • 协议差异(代理与后端解析不一致)

五、验证要点

  • 先证明出网(DNSLog 外带),再证明内网可达
  • 云元数据:能读取即为严重(临时凭证可能接管云账号)
  • 内网 Redis/数据库:未授权可交互即为严重
  • 响应差异:端口开放/关闭、服务指纹、错误信息
  • 报告标注:网络位置、出网方向、可达内网网段

六、修复建议

  • URL 白名单(协议+域名+端口),禁止私网地址
  • 禁用重定向跟随、禁用危险协议(file/gopher/dict)
  • DNS 解析后二次校验 IP,防 DNS 重绑定
  • 出口流量隔离、最小权限网络策略
  • 云元数据服务:IMDSv2 + 限制访问

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

Install and usage instructions live in the source repository linked above.

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Versions

  • v0.1.0 Imported from the upstream source.