Source: cve@mitre.org
Cross-site request forgery (CSRF) vulnerability in usercp2.php in MyBB (aka MyBulletinBoard) before 1.4.12 allows remote attackers to hijack the authentication of unspecified victims via unknown vectors.
MyBB versions prior to 1.4.12 are vulnerable to a Cross-Site Request Forgery (CSRF) attack, allowing attackers to hijack authenticated user sessions. This vulnerability enables attackers to perform unauthorized actions on behalf of victims, potentially leading to account compromise and data breaches.
Step 1: Victim Authentication: The victim is logged into their MyBB account.
Step 2: Attacker Crafting: The attacker crafts a malicious HTML page or email containing a hidden form or a specially crafted URL that, when accessed by the victim, will trigger a request to usercp2.php.
Step 3: Payload Delivery: The attacker lures the victim into visiting the malicious page or clicking the malicious link. This could be achieved through phishing, social engineering, or other means.
Step 4: Request Execution: When the victim's browser loads the malicious page or clicks the link, the hidden form is automatically submitted or the crafted URL is accessed. This sends a request to usercp2.php with the attacker's desired actions, such as changing the victim's email address or password.
Step 5: Server Processing: Because MyBB lacks CSRF protection, the server processes the request as if it originated from the victim's browser, as the victim's session cookie is automatically included in the request.
Step 6: Action Completion: The server executes the attacker's requested action on behalf of the victim, effectively hijacking the victim's account or performing other unauthorized operations.
The vulnerability stems from a lack of proper CSRF protection within the usercp2.php file in MyBB. Specifically, the application fails to validate a CSRF token or implement other mechanisms to verify the origin of requests. This allows an attacker to craft malicious requests that, when executed by a logged-in user, are processed by the server as legitimate actions performed by that user. The root cause is the absence of a security check to ensure that requests originate from the user's browser and not a malicious third-party site. This allows attackers to manipulate user settings, post content, or potentially gain access to sensitive information depending on the functionality exposed within usercp2.php.
This vulnerability is not directly associated with specific APT groups or malware families. However, it provides a means for attackers to gain initial access or escalate privileges, which could be leveraged by any threat actor. CISA KEV status: Not listed.
Monitor web server logs for suspicious requests to usercp2.php from unexpected IP addresses or user agents.
Analyze HTTP requests for unusual parameters or values that could indicate CSRF exploitation.
Implement a web application firewall (WAF) to detect and block malicious requests based on known CSRF attack patterns.
Monitor user account activity for unauthorized changes, such as password resets or email address modifications.
Upgrade MyBB to version 1.4.12 or later. This is the primary and most effective remediation.
Implement a web application firewall (WAF) to filter malicious requests.
Educate users about the risks of clicking on suspicious links or visiting untrusted websites.
Regularly review and audit user account activity for any signs of compromise.
Implement a Content Security Policy (CSP) to mitigate the impact of XSS vulnerabilities, which could be used in conjunction with CSRF attacks.