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CVE-2011-10018: Unauthorized Backdoor in myBB 1.6.4 Allows Remote Code Execution

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Overview

In this blog post, we delve into CVE-2011-10018, a severe cybersecurity flaw discovered in myBB version 1.6.4. This vulnerability was due to an unauthorized backdoor embedded in the source code, enabling hackers to execute arbitrary PHP code remotely. The affected software, myBB, is a popular open-source forum software used by millions of websites worldwide. The gravity of this exploit lies in the fact that it requires no authentication, potentially leading to a full compromise of the web server under the context of the web application.

Vulnerability Summary

CVE ID: CVE-2011-10018
Severity: Critical (9.8/10)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Full compromise of the web server, potential system compromise or data leakage

Affected Products

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Product | Affected Versions

myBB | 1.6.4

How the Exploit Works

The exploit takes advantage of an unauthorized backdoor in the source code of myBB version 1.6.4. This backdoor allows attackers to execute arbitrary PHP code remotely by injecting payloads into a specially crafted collapsed cookie. This means that an attacker can manipulate the web server to execute malicious code without any authentication or user interaction. Since the vulnerability was introduced during the packaging process, it is not part of the intended application logic, making it difficult to detect without a thorough source code review.

Conceptual Example Code

Below is a conceptual example of how this vulnerability might be exploited. The attacker crafts a malicious payload and injects it into a collapsed cookie sent to the vulnerable server.

GET / HTTP/1.1
Host: target.example.com
Cookie: MYBB[COLLAPSED]=arbitrary_php_code

In this example, `arbitrary_php_code` would be replaced with the attacker’s malicious PHP code. When the server processes the cookie, it executes the injected PHP code, leading to a potential full system compromise.

Recommended Mitigations

As a response to this vulnerability, it is imperative to apply the vendor-supplied patch to remove the backdoor from the source code. If immediate patching is not possible, implementing a Web Application Firewall (WAF) or Intrusion Detection System (IDS) may serve as a temporary mitigation. These solutions can help detect and block the execution of malicious PHP code sent through collapsed cookies, reducing the risk of server compromise.

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Disclaimer:

The information and code presented in this article are provided for educational and defensive cybersecurity purposes only. Any conceptual or pseudocode examples are simplified representations intended to raise awareness and promote secure development and system configuration practices.

Do not use this information to attempt unauthorized access or exploit vulnerabilities on systems that you do not own or have explicit permission to test.

Ameeba and its authors do not endorse or condone malicious behavior and are not responsible for misuse of the content. Always follow ethical hacking guidelines, responsible disclosure practices, and local laws.

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