The popularity of Cloud Computing technology has made it a norm for IT deployment in enterprise, education and government sectors. But technologies in the cloud such as hypervisor or web-based dashboard have vulnerabilities which can potential cause data leakage. The impact of data leakage is huge, data leak incident at a firm such as Exactis cause 340 million of customer record being exposed. Moreover, the incident lead to financial loss, reputational damage, loss of customer trust and compliance issue to the firm. Therefore, there is a need to address the threat of data leakage in cloud computing platform. This paper presents the topic of data leakage detection in cloud computing platform. First we will discuss about the threat of data leakage during VM migration process and web dashboard authentication in cloud computing platform. To detect the data leakage, this paper proposes a method which involves performing packet capture on the platform. To demonstrate the method, this paper will simulate the threats and verify the data leakage. The results show that data leakage can be detected and verified effectively using the method when cloud management traffic is not encrypted.