[issue35748] urlparse library detecting wrong hostname leads to open redirect vulnerability

[Neeraj Sonaniya]

New submission from Neeraj Sonaniya <nsonaniya2010 at gmail.com>:

Summary:
It have been identified that `urlparse` under `urllib.parse` module is detecting wrong hostname which could leads to a security issue known as Open redirect vulnerability.

Steps to reproduce the issue:

Following code will help you in reproducing the issue:

```
from urllib.parse import urlparse
x= 'http://www.google.com\@xxx.com'
y = urlparse(x)
print(y.hostname)
```

Output:
xxx.com

The hostname from above URL which is actually rendered by browser is : 'https://www.google.com'.

In following browsers tested: (hostname detected as: https://www.google.com)

```
1. Chromium - Version 72.0.3626.7  - Developer Build
2. Firefox - 60.4.0esr (64-bit)
3. Internet Explorer - 11.0.9600.17843
4. Safari - Version 12.0.2 (14606.3.4)
```

----------
components: Library (Lib)
files: Screenshot from 2019-01-16 12-47-22.png
messages: 333750
nosy: nsonaniya2010, orsenthil
priority: normal
severity: normal
status: open
title: urlparse library detecting wrong hostname leads to open redirect vulnerability
type: security
versions: Python 3.6, Python 3.7, Python 3.8
Added file: https://bugs.python.org/file48058/Screenshot from 2019-01-16 12-47-22.png

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35748>
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