A biometric system is susceptible to a variety of attacks intended at undermining the reliability of the authentication process. More notably template security is of vital significance in the biometric systems because unlike passwords, stolen biometric templates cannot be revoked. In this paper, the authors portray the various threats that can be encountered by a biometric system. They particularly focus on attacks designed to extract information about the original biometric data of an individual from the stored template. A few algorithms presented in the literature are discussed in this regard. They have also examined techniques that can be used to daunt or detect these attacks.