Regex sanitizer bypass to arbitrary file read and directory traversal

jflyfox / jfinal_cms

jfinal cms是一个java开发的功能强大的信息咨询网站，采用了简洁强大的JFinal作为web框架，模板引擎用的是beetl，数据库用mysql，前端bootstrap框架。支持oauth2认证、帐号注册、密码加密、评论及回复，消息提示，网站访问量统计，文章评论数和浏览量统计，回复管理，支持权限管理。后台模块包含：栏目管理，栏目公告，栏目滚动图片，文章管理，回复管理，意见反馈，我的相册，相册管理，图片管理，专辑管理、视频管理、缓存更新，友情链接，访问统计，联系人管理，模板管理，组织机构管理，用户管理，角色管理，菜单管理，数据字典管理。

Apache License 2.0

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admin login required.

FileManager.java

    private String sanitize(String var) {
        String sanitized = var.replaceAll("\\<.*?>", "");
        sanitized = sanitized.replaceAll("http://", "");
        sanitized = sanitized.replaceAll("https://", "");
        sanitized = sanitized.replaceAll("\\.\\./", "");
        return sanitized;
    }

regex expression "\.\./" is designed to filter out "../" while "..././" totally bypasses it. it leads to arbitrary file read and directory traversal using admin portal's file manager.

"../" won't work

"..././" works.

jflyfox / jfinal_cms

Regex sanitizer bypass to arbitrary file read and directory traversal #11