Description of the Discovered Bug: Stored XSS in 1001Fonts
Bug Name: Stored Cross-Site Scripting (XSS)
Severity: Critical
Description:
A critical vulnerability, identified as a Stored Cross-Site Scripting (XSS), has been discovered in the 1001Fonts system. This security flaw allows an attacker to inject malicious scripts into web pages that are permanently stored on the server and viewed by other users. As a result, unauthorized actions can be performed on behalf of users, leading to the exposure of sensitive information.
Impact:
The exploitation of this stored XSS vulnerability has significant consequences, including:
– Unauthorized Actions: Attackers can execute arbitrary scripts in the context of users’ browser sessions, potentially leading to unauthorized actions being performed.
– Exposure of Sensitive Information: User session tokens, credentials, and other sensitive information can be stolen.
– Persistent Threat: Since the malicious script is stored on the server, it will be executed each time the affected page is loaded by any user, creating a persistent threat.
– Compromise of User Accounts: By hijacking sessions, attackers can gain unauthorized access to user accounts and sensitive data.
– Spread of Malware: The malicious script can be used to spread malware or perform phishing attacks on unsuspecting users.
Technical Details:
Stored XSS attacks exploit web application vulnerabilities by injecting malicious scripts into data that is stored on the server and displayed to users. When users access the affected page, the malicious script is executed in their browsers, allowing the attacker to perform actions or access information without authorization.
In this particular instance, the stored XSS vulnerability was found in a user input field of the 1001Fonts web application. By injecting a malicious script into this field, the attacker ensured that the script was stored on the server and executed each time the affected page was accessed by any user. This enabled the attacker to steal session tokens, perform unauthorized actions, and spread malware.
