If you use the eolinker apinto-dashboard, listen up! A problem has been found that could expose your users to dangerous attacks. In this post, I'll break down the details, show basic exploit code, and help you understand how to protect your application.

What Is CVE-2022-3797?

CVE-2022-3797 is the identifier given to a security problem found in eolinker apinto-dashboard. The vulnerability allows attackers to perform an open redirect through the /login page by abusing the callback parameter.

Why Is It Bad?

An open redirect lets attackers trick your users into clicking a link that looks safe (like your login page), but then sends them to a bad site instead—maybe even one controlled by the attacker. This is commonly used for phishing attacks.

Technical Details

- File Affected: /login

Remote Exploit: Yes, attackers don’t need any special access.

- Reference: VDB-212633

The key problem is that whatever you put into the callback URL parameter gets used as a redirect address without checking where it leads.

- Vuldb Advisory - VDB-212633
- GitHub Project (not yet patched)

https://your-domain.com/login?callback=https://evil.com

After a successful login, your site sends the user off to https://evil.com instead of a safe page. That’s dangerous.

Here's what an attacker might do

import requests

malicious_url = 'https://your-domain.com/login?callback=https://evil.com'
session = requests.Session()
# Simulate a login or just visit the URL.
response = session.get(malicious_url, allow_redirects=True)

print("Redirected to:", response.url)

Or, for phishing, just send your users an email containing https://evil.com" rel="nofollow">the malicious link.

https://phish-site.com" rel="nofollow">https://legit-site.com/login?callback=https://phish-site.com

User believes they’re logging in.

3. After login (or sometimes right away), they're redirected to https://phish-site.com

Example of Safe Go code (pseudo-code)

import "net/url"

allowedHosts := []string{"your-domain.com"}
target := req.URL.Query().Get("callback")
u, err := url.Parse(target)
if err != nil || u.Host != "your-domain.com" {
    http.Error(w, "Invalid redirect", http.StatusBadRequest)
    return
}
// Redirect safely here

Is There a Patch?

As of this writing, there may not be a fix in the upstream repository. Track progress here:
- Eolinker apinto-dashboard Issues

- Admins: Add web application firewall (WAF) rules to block URLs with external callback destinations.

Conclusion

Open redirects are often underestimated, but CVE-2022-3797 could make your users easy targets for phishing. If you use or build on top of eolinker apinto-dashboard, don’t ignore this issue!

Stay safe and keep your software up to date.

If you want to report new details or see if a patch is available, check these resources

- Vuldb - CVE-2022-3797
- Eolinker apinto-dashboard on GitHub


*Exclusive analysis by Assistant, 2024. For educational purposes only. Do not exploit systems without permission!*

Timeline

Published on: 11/01/2022 16:15:00 UTC
Last modified on: 11/02/2022 16:36:00 UTC