-5

嗨,我发现某些代码注入了我的 php 应用程序。有谁知道这是怎么可能的,还向我解释了如何避免这种注射。该代码位于 img 标签的 src 属性下。请帮助弄清楚这段代码的作用是什么?

src='data:image/jpeg;base64,/9j/4AAQSkZJRgABAQEAYABgAAD/7QhcUGhvdG9zaG9wIDMuMAA4QklNA+0AAAAAABAASAAAAAEA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='
4

4 回答 4

2

这个“恶意代码”是JPEG图像。

像这样 :在此处输入图像描述

于 2012-03-19T12:53:58.553 回答
0

正如已经指出的,这只是一个字节编码的图像。您可以通过在显示/存储(例如在您的数据库中)之前正确转义用户输入来避免此类注入。你应该看看HTMLPurifier

于 2012-03-19T12:58:37.723 回答
0

这段代码没有任何问题。它只是图像的 base64 编码字节数组。

于 2012-03-19T12:55:20.770 回答
0

这不是恶意软件代码。这实际上是一个图像。(我什至可以告诉你这是在 Photoshop3.0 中创建/修改的)你的代码在其他地方有问题。看起来您正在使用数据本身作为文件名。

于 2012-03-19T12:59:05.043 回答