About 3 years ago I built a site for a somewhat large non-profit organization in our state. When it came time to deploy the application to their web host server, I noticed an odd file named "cc.txt" or something obvious like that in their public site. It was under their web root, was getting served, and was a csv file of all their donor's names, addresses, credit card numbers, expiration dates, and CVV/CVC codes. I cannot count the number of times I brought the issue up - first to my boss, then our company accountant, the client's IT director, finally the client's President. That was 3 years ago. The file is still being served, it can even be googled. And it's been updated. I tend not to respond to their donation solicitations when I get them.

这是很久以前的事了……但DEC的VAX系统过去是随账户一起发货的:

系统登录: 密码:经理

而且 登录:字段 服务密码:

大多数系统管理员都知道SYSTEM帐户，并且大多数(但不是全部)会更改它。然而，并不是所有人都知道FIELD帐户也有SYSTEM特权。

public class AuthenticationServlet extends HttpServlet
{
    private String userName;
    private String password;

    protected doPost(HttpServletRequest req, HttpServletResponse resp)
           throws ServletException, IOException
    {
        userName = request.getParameter("userName");
        password = request.getParameter("password");
        authenticateUser(userName,password);
        ......
    }
}

显然，正如有人在自动化负载测试中发现的那样，单例和缺乏同步会导致安全问题。

我工作的公司有很多安全错误……下面是一些比较糟糕的例子:

所有的前雇员仍然拥有所有东西的活跃账户，即使是那些被解雇或关系不好的人 我们开发的每个站点(200多个)都有相同的管理员用户名和密码，所有在这里工作的员工都知道

史诗般的失败。

一个让我害怕的安全漏洞是在我曾经维护的一个遗留应用程序中，其中有一个settings.ini文件，其中的数据库凭据是纯文本的，所有用户密码都以纯文本的形式存储在数据库中。

我见过的大多数安全漏洞都发生在我的高中和大学。

首先，我发现我可以通过(非常简单的)ping flood攻击来关闭学校的互联网。不仅仅是我高中的互联网，整个学校系统，包括大学的一部分。绝对没有速率限制。在我演示之后，他们最终把它修好了。(顺便说一句，我的第一份编程工作就是靠这种“宣传”获得的)

第二点，也是可能性更大的一点是:

Ok, so every computer in the school was connected to a domain and such. So, when you logged onto a computer, it would copy down a generic user directory(including application data, etc folders) and then proceed with the login. Some people had their own logins other than the generic "student" account for one reason or another. Well, while I was browsing the public server where everything was shared on, I found a /users directory. Upon looking at it I discovered froma generic student account I had read-write to every users directory, including teachers, administrator, and the generic student account.

为了愚人节，我计划写一个简单的批处理文件或小程序，弹出一些类似Class of 09 rocks的东西!登陆每个人只是为了演示它，但我退缩了。我也从来没有告诉过管理员，所以这个安全漏洞可能仍然存在。

在我以前工作的店里有个不错的。通往非公共区域的门有小键盘，所以你必须输入pin码才能进入。然而，你只需按#，门就会打开，这是我们喜欢的事实，因为按#比按6位pin码容易得多。