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Several attacks on the WEP algorithm surfaced just shortly after its commercial introduction and implementation in wireless APs and client cards The attacks range from passive to active, from dictionary based to key length, and one-to-one to man-inthe-middle However, in general, most of the attacks work via brute-force techniques Such techniques allow an attacker to test entire keysets, all the possibilities, looking for the single correct instance The other category for attacking WEP is based on analysis of the IVs in correlation to the first RC4 output byte As mentioned previously, brute-force attacks are commonly used to exploit some of the key weaknesses within the WEP algorithm, particularly in determining the shared secret key Passive attacks that is, attacks that do not require you to send any packets allow you to sniff 80211 packets and perform computations on those packets locally The goal for this type of attack is not to knock other systems off the Net or to forge packets to systems but rather to gather information about the network clients, the implemented security features, and the AP configuration, in addition to potentially cracking the WEP key Through traffic analysis, you can potentially determine the services running, the encryption and authentication methods, whether a MAC-based authentication schema is implemented, and what the size of the key is in bits The only passive attacks that target the WEP algorithm are key and packet cracking The attack starts by sniffing a large number of packets from potentially numerous clients (the more packets, the more likely the attack will be successful) Because the IV is in cleartext, you can do packet analysis based on client and corresponding IV Once you have two packets that use the same IV, you can XOR the packets and obtain the one XOR of the packets This can be used to infer information about the packets and further eliminate possibilities within the keyspace for brute-force attacks on the message Once the XOR, encrypted text, and unencrypted text of a packet is determined, it s trivial to determine the shared secret because the shared secret was used to create the XOR The other type of attack is simply brute-forcing the shared secret key You can attempt to decrypt the message in the same fashion that an AP would, verifying success via the checksum By taking advantage of the IV weaknesses, you can execute dictionary attacks on WEP checks in minutes or sometimes seconds, depending on the wordlist and CPU speed An entire 40-bit keyspace brute-force attack only takes about a few weeks when running on a single system Almost all the active attacks against the WEP algorithm focus on injecting packets into current 80211 streams However, in all cases, you must first know the MAC of the AP and whether WEP is enforced, as well as the bit-strength and key if it is implemented Now that you understand what you need, if WEP is disabled, the effort to use a packetinjection technique is insignificant In either case, you would just forge the packet you want to write to the wire and send it off The tools that use some of these techniques include Air-Jack and Libradiate (http://wwwpacketfactorynet/projects/libradiate/).

Being the victim of a ruinous information warfare attack will likely result in extensive economic damage as well as disruption of commerce, banking, and international trade However, the nation, region, or population that is the target of a ruinous information warfare attack will probably not be the only victim Any government or unofficial illegitimate attacker that would be foolish or desperate enough to attempt a ruinous information warfare attack will also be careless enough to do damage to innocent states that share communications resources or have some economic dependency on the attacked nation or region Those who launch ruinous information warfare attacks are also likely to use self-replicating viruses and malicious code against their target, which will inevitably spread itself to other areas of the world Ruinous information warfare attacks will be designed to inflict the maximum damage in the shortest period of time The most aggressive information warriors who launch ruinous information warfare attacks may also attempt to keep other nations from coming to the aid of their target This means the attacker may use whatever means they can think of to slow down the response of allies or major global alliances who will act to halt the attack or are likely to participate in retaliatory attacks of some type

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A few tools are available that automate or aid in the automation of exploiting WEP weaknesses In most cases, the tools use a combination of packet-capturing and packetcracking techniques to leverage these weaknesses

Popularity: Simplicity: Impact: Risk Rating: 8 7 9 8

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