Security vulnerabilities

Attached to Project: Security vulnerabilities
Opened by monty099 - 28.03.2025
Last edited by cbay - 28.03.2025

Vulnerability Description:

A vulnerability was discovered in Alwaysdata's domain and email management system, allowing an attacker to maintain an active session even after deleting their account. This vulnerability can be exploited through email domain reuse in Webmail, enabling an attacker to gain access to newly created email accounts without needing to steal login credentials.

Exploitation Steps:

1. The attacker adds the domain evil.com to their Alwaysdata account.

2. They create an email address admin@evil.com via Webmail (webmail.alwaysdata.com).

3. The attacker logs into Webmail and saves the session.

4. They delete their Alwaysdata account, but the Webmail session remains active.

5. A new user adds evil.com to their Alwaysdata account and creates the same email admin@evil.com.

6. Once the new user logs into Webmail, the attacker still has access to the email since their session remains active!

Proof of Concept (PoC) Provided: https://admin.alwaysdata.com/support/85071/

Impact of the Vulnerability:

Modification of email settings.

Wide-scale exploitation: The attacker can repeat the process with multiple domains, allowing them to gain control over different email accounts.

Recommendations to Fix the Vulnerability:

1. Terminate all active sessions immediately when an account is deleted or a domain is removed.

2. Link sessions to the user account instead of just the domain to ensure sessions do not transfer between different users.

This vulnerability poses a serious threat to user privacy and account security, and we strongly recommend fixing it as soon as possible.