我所见过的最糟糕的漏洞是web应用程序中的一个漏洞，即提供空用户名和密码将以管理员身份登录。

几年前我移植的一款遗留应用使用了第三方回调系统来处理支付。问题是，回调脚本没有检查支付的金额是否等于订单的价格，因此可以使用Firebug编辑支付页面上“金额”字段的内容，以0.01英镑的价格购买网站上的任何产品。

在一个论坛中，我已经获得了对隐藏线程和管理界面的只读访问权限，只需将cookie中的用户名替换为管理员的用户名，而不更改密码。

我曾经打电话给一个BBS，它在首页上有一个“Drop To DOS”选项。菜单上没有列出来，但我打错了，无意中找到了。

然后我可以远程访问这家伙的DOS命令行。

社会工程:

<Cthon98> hey, if you type in your pw, it will show as stars
<Cthon98> ********* see!
<AzureDiamond> hunter2
<AzureDiamond> doesnt look like stars to me
<Cthon98> <AzureDiamond> *******
<Cthon98> thats what I see
<AzureDiamond> oh, really?
<Cthon98> Absolutely
<AzureDiamond> you can go hunter2 my hunter2-ing hunter2
<AzureDiamond> haha, does that look funny to you?
<Cthon98> lol, yes. See, when YOU type hunter2, it shows to us as *******
<AzureDiamond> thats neat, I didnt know IRC did that
<Cthon98> yep, no matter how many times you type hunter2, it will show to us as *******
<AzureDiamond> awesome!
<AzureDiamond> wait, how do you know my pw?
<Cthon98> er, I just copy pasted YOUR ******'s and it appears to YOU as hunter2 cause its your pw
<AzureDiamond> oh, ok.

从bash.org

我们有一个旧的计算机集群，在我工作的一个实验室里没有运行。几个本科生认为，让它运行起来会很有趣，这样他们就可以学习一点并行计算了。他们让它运行起来，结果证明它非常有用。

One day I came in and was checking out the stats...It was running at 100%. Now this was a 24 node cluster and there were only 3 of us that ever used it so it was a little strange that it was running at this load. I started playing with it, trying to figure out what was loading it...turned out someone had gained access and was using it as their own little porn server and spammer. I asked the undergrads what kind of security they put on it, they looked at me and said "Security? We didn't think it would need any."

我给它加了个密码，就这样。把它用作色情服务器的人原来是一个本科生的朋友。