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bandwidth available for Internet applications The PDAs and other devices that WTLS must accommodate are limited in all these respects Thus, WTLS has to be able to cope with small amounts of memory and limited processor capacity, as well as long roundtrip times that TLS could not handle well These requirements are the primary reasons that WTLS has security issues As the protocol is designed around more capable servers than devices, the WTLS specification can allow connections with little to no security Clients with low memory or CPU capabilities cannot support encryption, and choosing null or weak encryption greatly reduces confidentiality Authentication is also optional in the protocol, and omitting authentication reduces security by leaving the connection vulnerable to a man-in-the-middle type attack In addition to the general flaws in the protocol s implementation, several known security vulnerabilities exist, including those to the chosen plaintext attack, the PKCS #1 attack, and the alert message truncation attack The chosen plaintext attack works on the principle of predictable initialization vectors (IVs) By the nature of the transport medium that it is using, WAP, WTLS needs to support unreliable transport This forces the IV to be based on data already known to the client, and WTLS uses a linear IV computation Because the IV is based on the sequence number of the packet and several packets are sent unencrypted, entropy is severely decreased This lack of entropy in the encrypted data reduces confidentiality Now consider the PKCS #1 attack Public-Key Cryptography Standards (PKCS), used in conjunction with RSA encryption, provides standards for formatting the padding used to generate a correctly formatted block size When the client receives the block, it will reply to the sender as to the validity of the block An attacker takes advantage of this by attempting to send multiple guesses at the padding to force a padding error In vulnerable implementations, WTLS will return error messages providing an Oracle decrypting RSA with roughly 2 chosen ciphertext queries Alert messages in WTLS are sometimes sent in plaintext and are not authenticated This fact could allow an attacker to overwrite an encrypted packet from the actual sender with a plaintext alert message, leading to possible disruption of the connection through, for instance, a truncation attack
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EXAM TIP WAP is a point-to-multipoint protocol, but it can face disruptions or attacks because it aggregates at well-known points: the cellular antenna towers Some concern over the so-called WAP gap involves confidentiality of information where the two different networks meet, the WAP gateway WTLS acts as the security protocol for the WAP network, and TLS is the standard for the Internet, so the WAP gateway has to perform translation from one encryption standard to the other This translation forces all messages to be seen by the WAP gateway in plaintext This is a weak point in the network design, but from an attacker s perspective, it s a much more difficult target than the WTLS protocol itself Threats to the WAP gateway can be minimized through careful infrastructure design, such as secure physical location and allowing only outbound traffic from the gateway A risk of compromise still exists, however,
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10: Wireless Security
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and an attacker would find a WAP gateway an especially appealing target, as plaintext messages are processed through it from all wireless devices, not just a single user The solution for this is to have end-to-end security layered over anything underlying, in effect creating a VPN from the endpoint to the mobile device, or to standardize on a full implementation of TLS for end-to-end encryption and strong authentication The limited nature of the devices hampers the ability of the security protocols to operate as intended, compromising any real security to be implemented on WAP networks
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