In this long-read post, we will discuss the security vulnerability tracked as CVE-2024-34274 found in the OpenBD 20210306203917-6cbe797 software. OpenBD (Open BlueDragon) is an open-source CFML engine used to build and deploy web applications. More information about OpenBD can be found at their official website: OpenBD.org

As noted above, this vulnerability only affects products no longer supported by the maintainer, so it is important for users to update their software to the latest supported version.

Vulnerability Details

CVE-2024-34274 is categorized as a Deserialization of Untrusted Data vulnerability. Deserialization vulnerabilities occur when an application deserializes data from an untrusted source without proper validation, allowing an attacker to execute arbitrary code on the targeted system.

In the case of OpenBD 20210306203917-6cbe797, the cookies bdglobals and bdclient_spot are found to use serialized data which could be utilized by an attacker to execute arbitrary code. The original reference to this vulnerability can be found at the following link: CVE-2024-34274

Code Snippet Example

To give you a better understanding of this vulnerability, let's look at a code snippet demonstrating the deserialization process in OpenBD:

public class DeserializeCookie {
    public static void main(String[] args) {
        String serializedData = "rOABXNyACpj..."; // Truncated for brevity
        deserializeCookieData(serializedData);
    }

    public static void deserializeCookieData(String serializedData) {
        try {
            byte[] data = Base64.getDecoder().decode(serializedData);
            ByteArrayInputStream in = new ByteArrayInputStream(data);
            ObjectInputStream ois = new ObjectInputStream(in);

            Object obj = ois.readObject();
            processCookieData(obj);

            ois.close();
            in.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static void processCookieData(Object obj) {
-       // Processing cookie data...
    }
}

As you can see in the example above, the deserializeCookieData() function receives a serialized string and decodes it using the Base64 decoder. It then creates an ObjectInputStream object and reads the deserialized object from it.

At this point, there is no validation or verification of the deserialized object, meaning an attacker could potentially manipulate the serialized data to include malicious code and execute arbitrary commands on the affected system.

Exploitation Details

An attacker could exploit this vulnerability by intercepting an HTTP request containing the bdglobals or bdclient_spot cookies and injecting malicious code into the serialized data.

Once the manipulated cookie is deserialized by the vulnerable OpenBD software, the arbitrary code embedded within the cookie data would be executed, allowing the attacker to potentially take control of the affected system.

4. The vulnerable OpenBD software deserializes the malicious cookie data without validation, leading to the execution of the arbitrary code.

Conclusion

Despite this vulnerability affecting unsupported products, it demonstrates the importance of proper deserialization security practices and input validation when working with serialized data, especially from untrusted sources.

Users of OpenBD are urged to update their software to the latest supported version to avoid potential exploitation of this vulnerability.

Additionally, application developers should always develop and follow secure coding guidelines to alleviate the risks posed by common security vulnerabilities like deserialization issues.

Timeline

Published on: 05/21/2024 20:15:08 UTC
Last modified on: 07/03/2024 01:59:50 UTC