Discord will only create embeds for videos and images if they are smaller than 25MB. We can "abuse" this by using the twitter:image HTML meta tag.
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Tracking issue for:
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Hi,
I think that I have a problem with the redirection of .html files
The upload goes well, all files are created, but when I post the .html link on discord nothing happens.
However, if I open this link on a browser, it redirects me to SERVE_DOMAIN/SERVE_DOMAIN/video/test.mp4 instead of SERVE_DOMAIN/video/test.mp4
SERVE_DOMAIN/video/test.mp4 is playing fine on browser, so I suppose that its just a problem from the redirection in the .html
Here is what a generated .html with embed.example.com looks like :
<!DOCTYPE html>
<html>
<!-- Generated at 2023-04-05 19:58:09 -->
<head>
<meta property="og:type" content="video.other">
<meta property="twitter:player" content="i.example.com/video/test.mp4">
<meta property="og:video:type" content="text/html">
<meta property="og:video:width" content="1920">
<meta property="og:video:height" content="1080">
<meta name="twitter:image" content="i.example.com/test.mp4.jpg">
<meta http-equiv="refresh" content="0;url=i.example.com/video/test.mp4">
</head>
</html>
Do you have an idea about what cause this issue, and how I can fix it ?
Thanks in advance
Tracking issue for:
Directly incorporating user input into a URL redirect request without validating the input can facilitate phishing attacks. In these attacks, unsuspecting users can be redirected to a malicious site that looks very similar to the real site they intend to visit, but which is controlled by the attacker.
To guard against untrusted URL redirection, it is advisable to avoid putting user input directly into a redirect URL. Instead, maintain a list of authorized redirects on the server; then choose from that list based on the user input provided.
Example
The following example shows an HTTP request parameter being used directly in a URL redirect without validating the input, which facilitates phishing attacks:
from flask import Flask, request, redirect
app = Flask(__name__)
@app.route('/')
def hello():
target = request.args.get('target', '')
return redirect(target, code=302)One way to remedy the problem is to validate the user input against a known fixed string before doing the redirection:
from flask import Flask, request, redirect
VALID_REDIRECT = "http://cwe.mitre.org/data/definitions/601.html"
app = Flask(__name__)
@app.route('/')
def hello():
target = request.args.get('target', '')
if target == VALID_REDIRECT:
return redirect(target, code=302)
else:
... # ErrorOWASP: XSS Unvalidated Redirects and Forwards Cheat Sheet.
Common Weakness Enumeration: CWE-601.
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