灵感笔记 100 3465 solves 你是一个自由撰稿人,使用"灵感笔记"云笔记工具。今天登录...

創建於:2026年5月10日

使用 GPT-5.5 Thinking 回答 Chat01

問題

灵感笔记
100
3465 solves

你是一个自由撰稿人,使用"灵感笔记"云笔记工具。今天登录后,偶然发现这个笔记系统似乎有点问题...找到隐藏的Flag!
题目地址:39.105.213.28:5000
用户名:admin,密码:123456

思考

我这边已经先做了连通性验证:目标不是返回登录页或 403,而是 TCP 连接直接被拒绝,说明当前端口 5000 没有可访问的服务。

Thought for 1m 20s

回答

目前没法直接拿到 Flag:我这边访问靶机时,39.105.213.28:5000 端口直接 Connection refused,不是登录失败、403 或 WAF 拦截。

我验证到的结果类似:

bash
nc -vz -w 5 39.105.213.28 5000 # connect to 39.105.213.28 port 5000 failed: Connection refused curl -v --connect-timeout 5 http://39.105.213.28:5000/ # Failed to connect to 39.105.213.28 port 5000

这通常表示:

  1. 靶机实例已过期或服务没启动;
  2. 平台需要重新启动题目环境;
  3. 端口只允许特定网络访问;
  4. 地址/端口已变更。

我不能凭空编一个 Flag。你可以先在本地浏览器确认能否打开该地址。如果能打开,可以优先按这个思路测:

python
import requests import re base = "http://39.105.213.28:5000" s = requests.Session() # 登录 r = s.post( base + "/login", data={"username": "admin", "password": "123456"}, allow_redirects=True ) print("login:", r.status_code, r.url) # 常见入口 paths = [ "/", "/robots.txt", "/flag", "/admin", "/notes", "/api/notes", "/api/note/1", "/user/1", "/profile", ] for p in paths: try: rr = s.get(base + p, timeout=5) text = rr.text[:300].replace("\n", " ") print(p, rr.status_code, text) m = re.search(r"flag\{.*?\}|ctf\{.*?\}", rr.text, re.I) if m: print("FOUND:", m.group()) break except Exception as e: print(p, e) # 笔记类题常见 IDOR:遍历 note id for i in range(1, 200): for tmpl in ["/note/{}", "/notes/{}", "/api/note/{}", "/api/notes/{}"]: url = base + tmpl.format(i) try: rr = s.get(url, timeout=3) if rr.status_code == 200: m = re.search(r"flag\{.*?\}|ctf\{.*?\}", rr.text, re.I) if m: print("FOUND at", url, m.group()) raise SystemExit except Exception: pass

这类“云笔记/隐藏 Flag”题高概率是登录后看接口、隐藏路由、笔记 ID 越权或前端 JS 泄露。把你本地能打开后的页面源码、登录后抓包响应或截图发来,我会继续帮你定位。

問題

<!DOCTYPE html> <html lang="zh-CN"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>我的笔记 - 灵感笔记</title> <style> * { margin: 0; padding: 0; box-sizing: border-box; } body { font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; background: #f5f5f5; } .header { background: linear-gradient(135deg, #56ab2f 0%, #a8e063 100%); color: white; padding: 15px 30px; display: flex; justify-content: space-between; align-items: center; } .header h1 { font-size: 20px; } .header a { color: white; text-decoration: none; padding: 6px 12px; background: rgba(255,255,255,0.2); border-radius: 5px; font-size: 14px; } .main { display: flex; min-height: calc(100vh - 60px); } .sidebar { width: 220px; background: white; border-right: 1px solid #e0e0e0; padding: 20px 0; } .sidebar-section { margin-bottom: 20px; } .sidebar-title { padding: 10px 20px; font-size: 12px; color: #999; text-transform: uppercase; } .sidebar-item { display: flex; align-items: center; padding: 12px 20px; color: #333; text-decoration: none; cursor: pointer; transition: background 0.2s; } .sidebar-item:hover { background: #f0f0f0; } .sidebar-item.active { background: #e8f5e9; color: #2e7d32; border-right: 3px solid #56ab2f; } .sidebar-icon { margin-right: 10px; font-size: 16px; } .sidebar-badge { margin-left: auto; background: #56ab2f; color: white; padding: 2px 8px; border-radius: 10px; font-size: 12px; } .content { flex: 1; padding: 30px; } .toolbar { display: flex; justify-content: space-between; align-items: center; margin-bottom: 25px; } .search-box { display: flex; align-items: center; background: white; border: 1px solid #ddd; border-radius: 20px; padding: 8px 15px; width: 300px; } .search-box input { border: none; outline: none; width: 100%; font-size: 14px; } .search-box button { background: none; border: none; cursor: pointer; font-size: 16px; } .toolbar-buttons button { margin-left: 10px; padding: 8px 16px; border: none; border-radius: 5px; cursor: pointer; font-size: 14px; } .btn-primary { background: #56ab2f; color: white; } .btn-secondary { background: #fff; border: 1px solid #ddd !important; color: #666; } .stats { display: flex; gap: 15px; margin-bottom: 25px; } .stat-card { background: white; padding: 15px 20px; border-radius: 8px; flex: 1; box-shadow: 0 1px 3px rgba(0,0,0,0.1); } .stat-number { font-size: 24px; font-weight: bold; color: #56ab2f; } .stat-label { font-size: 12px; color: #666; } .notes { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 20px; } .project-card { background: white; padding: 20px; border-radius: 10px; box-shadow: 0 2px 10px rgba(0,0,0,0.1); transition: transform 0.2s; } .project-card:hover { transform: translateY(-5px); box-shadow: 0 4px 15px rgba(0,0,0,0.15); } .project-card h3 { color: #333; margin-bottom: 8px; font-size: 16px; } .project-card p { color: #666; font-size: 13px; margin-bottom: 12px; line-height: 1.5; } .project-card .meta { color: #999; font-size: 12px; margin-bottom: 10px; display: flex; justify-content: space-between; } .project-card .tags { margin-bottom: 12px; } .project-card .tag { display: inline-block; background: #e8f5e9; color: #2e7d32; padding: 2px 8px; border-radius: 3px; font-size: 11px; margin-right: 5px; } .project-card a { display: inline-block; padding: 8px 16px; background: #56ab2f; color: white; text-decoration: none; border-radius: 5px; font-size: 13px; } .project-card a:hover { background: #4a9a26; } .empty { text-align: center; color: #999; padding: 60px; background: white; border-radius: 10px; } </style> </head> <body>
text
<input type="hidden" id="is-admin" value="true"> <div class="header"> <h1>灵感笔记</h1> <div> <span>欢迎, admin</span> <a href="/settings">设置</a> <a href="/logout">退出</a> </div> </div> <div class="main"> <div class="sidebar"> <div class="sidebar-section"> <div class="sidebar-title">笔记</div> <a href="/dashboard" class="sidebar-item active"> <span class="sidebar-icon">📝</span> 全部笔记 <span class="sidebar-badge">2</span> </a> <div class="sidebar-item"> <span class="sidebar-icon">⭐</span> 收藏夹 <span class="sidebar-badge">0</span> </div> <div class="sidebar-item"> <span class="sidebar-icon">🕐</span> 最近修改 </div> </div> <div class="sidebar-section"> <div class="sidebar-title">文件夹</div> <div class="sidebar-item"> <span class="sidebar-icon">📁</span> 默认文件夹 <span class="sidebar-badge">2</span> </div> <div class="sidebar-item"> <span class="sidebar-icon">📁</span> 写作 </div> </div> <div class="sidebar-section"> <div class="sidebar-title">标签</div> <div class="sidebar-item"> <span class="sidebar-icon">🏷️</span> 随笔 </div> <div class="sidebar-item"> <span class="sidebar-icon">🏷️</span> 日记 </div> <div class="sidebar-item"> <span class="sidebar-icon">🏷️</span> 素材 </div> </div> <div class="sidebar-section"> <div class="sidebar-title">其他</div> <div class="sidebar-item"> <span class="sidebar-icon">🗑️</span> 回收站 </div> <a href="/feedback" class="sidebar-item"> <span class="sidebar-icon">📧</span> 联系作者 </a> </div> </div> <div class="content"> <div class="toolbar"> <div class="search-box"> <button>🔍</button> <input type="text" placeholder="搜索笔记..."> </div> <div class="toolbar-buttons"> <button class="btn-secondary">📥 导出</button> <button class="btn-secondary">📤 导入</button> <button class="btn-primary">+ 新建笔记</button> </div> </div> <div class="stats"> <div class="stat-card"> <div class="stat-number">2</div> <div class="stat-label">笔记总数</div> </div> <div class="stat-card"> <div class="stat-number">103</div> <div class="stat-label">总字数</div> </div> <div class="stat-card"> <div class="stat-number">2</div> <div class="stat-label">文件夹</div> </div> </div> <h2 style="margin-bottom: 20px; color: #333;">全部笔记</h2> <div class="notes"> <div class="project-card"> <h3>置顶笔记</h3> <p>一些很重要的笔记,永远不要删除</p> <div class="tags"> <span class="tag">重要</span> <span class="tag">秘密</span> </div> <div class="meta"> <span>📅 2024-01-15</span> <span>📝 35字</span> </div> <a href="/project/flag-project-001">查看详情</a> </div> <div class="project-card"> <h3>草稿箱</h3> <p>还没写完的文章和想法</p> <div class="tags"> <span class="tag">草稿</span> </div> <div class="meta"> <span>📅 2024-01-10</span> <span>📝 68字</span> </div> <a href="/project/admin-notes-002">查看详情</a> </div> </div> </div> </div> <div id="modal" style="display:none;position:fixed;top:0;left:0;width:100%;height:100%;background:rgba(0,0,0,0.5);z-index:1000;"> <div style="position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);background:white;padding:30px;border-radius:10px;text-align:center;max-width:400px;"> <p id="modal-msg" style="font-size:16px;color:#333;margin-bottom:20px;"></p> <button onclick="document.getElementById('modal').style.display='none'" style="background:#56ab2f;color:white;border:none;padding:10px 30px;border-radius:5px;cursor:pointer;">确定</button> </div> </div> <script> function showModal(msg) { document.getElementById('modal-msg').textContent = msg; document.getElementById('modal').style.display = 'block'; } document.querySelector('.search-box button').addEventListener('click', function() { var keyword = document.querySelector('.search-box input').value; if (keyword) { showModal('搜索功能正在开发中,敬请期待!\n\n关键词: ' + keyword); } else { showModal('请输入搜索关键词'); } }); document.querySelector('.search-box input').addEventListener('keypress', function(e) { if (e.key === 'Enter') { document.querySelector('.search-box button').click(); } }); document.querySelectorAll('.toolbar-buttons button').forEach(function(btn) { btn.addEventListener('click', function() { if (this.textContent.includes('新建')) { showModal('新建笔记功能正在开发中,敬请期待!'); } else if (this.textContent.includes('导入')) { showModal('导入功能正在开发中,敬请期待!\n\n支持格式: Markdown, TXT, HTML'); } else if (this.textContent.includes('导出')) { showModal('导出功能正在开发中,敬请期待!\n\n支持格式: Markdown, PDF, HTML'); } }); }); document.querySelectorAll('.sidebar-item').forEach(function(item) { item.addEventListener('click', function(e) { if (this.querySelector('a')) return; var text = this.textContent.trim(); if (text.includes('收藏')) { showModal('收藏夹功能正在开发中!'); } else if (text.includes('最近')) { showModal('最近修改功能正在开发中!'); } else if (text.includes('回收站')) { showModal('回收站功能正在开发中!'); } else if (text.includes('文件夹') || text.includes('标签')) { showModal('该功能正在开发中!'); } }); }); document.querySelectorAll('.stat-card').forEach(function(card) { card.style.cursor = 'pointer'; card.addEventListener('click', function() { showModal('统计功能正在完善中...'); }); }); </script> <script src="/main.js"></script> <div id="admin-hint" style="display:none;"></div>
</body> </html>

思考

从这段 HTML 看,入口已经很明确:/project/flag-project-001/main.js/settings/feedback 这几个点最可疑。我先按源码里的路由和脚本继续推。

Thought for 19s

回答

源码里最关键的线索是这几个:

html
<input type="hidden" id="is-admin" value="true"> <a href="/project/flag-project-001">查看详情</a> <script src="/main.js"></script> <div id="admin-hint" style="display:none;"></div>

优先访问这两个地址:

text
http://39.105.213.28:5000/project/flag-project-001 http://39.105.213.28:5000/main.js

尤其是 /project/flag-project-001,这个项目 ID 已经直接写成了 flag-project-001,大概率就是 flag 笔记详情页。

你本地可以这样抓:

bash
curl -i -c cookie.txt -d "username=admin&password=123456" \ http://39.105.213.28:5000/login curl -s -b cookie.txt \ http://39.105.213.28:5000/project/flag-project-001 curl -s -b cookie.txt \ http://39.105.213.28:5000/main.js

如果详情页没直接显示 flag,继续试这些接口:

bash
for u in \ /project/flag-project-001 \ /api/project/flag-project-001 \ /api/projects/flag-project-001 \ /api/note/flag-project-001 \ /api/notes/flag-project-001 \ /admin \ /admin/hint \ /api/admin \ /api/admin/hint \ /flag do echo "===== $u =====" curl -s -b cookie.txt "http://39.105.213.28:5000$u" | head -c 1000 echo done

同时查看页面源码,不只看浏览器渲染结果:

bash
curl -s -b cookie.txt \ http://39.105.213.28:5000/project/flag-project-001 \ | grep -iE "flag|ctf|hint|admin|secret|隐藏|秘密"

我这里依然连不上该端口,所以不能替你直接读取最终 flag。把 /project/flag-project-001/main.js 的返回内容贴出来,基本就能继续定位到具体 flag。

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