菜单
Security anti-pattern for session fixation vulnerabilities (CWE-384). Use when generating or reviewing code that handles user sessions, login flows, or authentication state changes. Detects failure to regenerate session IDs after authentication.
默认使用会先检查来源的 Prompt；你也可以切换为直接命令，或下载本地副本。
决定是否安装前，请先阅读 SKILL.md，以及 SkillsMP 当前展示的配套文件。
用 Codex 或 Claude 帮你安装 复制这段 Prompt，粘贴到 Codex、Claude 或其他助手里，让它检查 Skill 页面并帮你完成安装。
直接命令不会经过审查 Prompt；运行前请先检查来源。
npx skills add https://github.com/igbuend/grimbard --skill session-fixation-anti-pattern命令会保持在同一行。复制前请横向滚动并检查完整内容。
想先保存到本地？可下载 SkillsMP 当前能够提供的文件。
Data visualization and information design best practices. Use when creating charts, dashboards, graphs, or any visual representation of data.
Typography principles for print and screen. Use when selecting fonts, setting type, designing text layouts, or creating web typography.
Reviews skills against Claude Code best practices. Use when auditing skill files for adherence to recommendations.
正在显示 SKILL.md
基于 SOC 职业分类
| name | session-fixation-anti-pattern |
| description | Security anti-pattern for session fixation vulnerabilities (CWE-384). Use when generating or reviewing code that handles user sessions, login flows, or authentication state changes. Detects failure to regenerate session IDs after authentication. |
Severity: High
Attackers fix a user's session ID before login. The attacker obtains a valid session ID, tricks the victim into using it, and when authentication fails to regenerate the session ID, hijacks the victim's authenticated session.
The anti-pattern is reusing the same session ID before and after authentication.
# VULNERABLE: Session ID not regenerated after login.
from flask import Flask, session, redirect, url_for, request
app = Flask(__name__)
app.secret_key = 'your_secret_key' # Insecure in production
@app.route('/')
def index():
if 'username' in session:
return f'Hello {session["username"]}! <a href="/logout">Logout</a>'
return 'Welcome, please <a href="/login">Login</a>'
@app.route('/login', methods=['GET', 'POST'])
def login():
if request.method == 'POST':
username = request.form['username']
password = request.form['password']
if check_credentials(username, password):
# FLAW: Session ID not regenerated.
# Existing session (potentially attacker-fixed) now authenticated.
session['username'] = username
return redirect(url_for('index'))
return 'Invalid credentials'
return '''
<form method="post">
<p><input type=text name=username></p>
<p><input type=password name=password></p>
<p><input type=submit value=Login></p>
</form>
'''
# Attack:
# 1. Attacker gets session_id=ABCD
# 2. Tricks victim into using session_id=ABCD (XSS, referrer, etc.)
# 3. Victim logs in, server reuses session_id=ABCD
# 4. Attacker hijacks authenticated session with session_id=ABCD
# SECURE: Regenerate session ID after login and privilege changes.
from flask import Flask, session, redirect, url_for, request
app = Flask(__name__)
app.secret_key = 'your_secret_key' # Use strong, securely managed key
@app.route('/')
def index_secure():
if 'username' in session:
return f'Hello {session["username"]}! <a href="/logout">Logout</a>'
return 'Welcome, please <a href="/login_secure">Login Securely</a>'
@app.route('/login_secure', methods=['GET', 'POST'])
def login_secure():
if request.method == 'POST':
username = request.form['username']
password = request.form['password']
if check_credentials(username, password):
# Regenerate session ID after authentication.
# Creates new session, invalidating pre-login session ID.
session.regenerate()
session['username'] = username
return redirect(url_for('index_secure'))
return 'Invalid credentials'
return '''
<form method="post">
<p><input type=text name=username></p>
<p><input type=password name=password></p>
<p><input type=submit value=Login></p>
</form>
'''
@app.route()
():
session.clear()
session.regenerate()
redirect(url_for())
HttpOnly: Prevents client-side script accessSecure: HTTPS-only transmissionSameSite: CSRF protection