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through 3 legacy modes once v21 + EDR becomes widespread) Like Security Mode 2, security in Security Mode 4 is implemented after link setup However, service security requirements must be identified as one of the following: Authenticated link key required Unauthenticated link key required No security required
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For more information, see NIST Special Publication 800-121: Guide to Bluetooth Security, by Karen Scarfone and John Padgette (http://csrcnistgov/publications/nistpubs/800-121/SP800-121pdf)
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In addition to reviewing the actual security features provided by Bluetooth, it is useful to acknowledge and refute two characteristics of Bluetooth communications that may be claimed as security features but do not provide any real protection: Frequency hopping The frequency-hopping scheme that Bluetooth uses does not provide any protection against eavesdropping There is no secret used to create the sequence of channels, and only 79 channels are used Thus, using a series of receivers to monitor all channels would make an offline attack possible (Bluetooth Security, p 31) Device proximity The limited range of Bluetooth radios (up to approximately 330 feet with Class 1 radios) cannot be reliably used as a security feature The supposed protection provided by limited signal strength can and has been defeated by attackers high gain antennas
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Threats to Bluetooth Devices and Networks
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Wireless networks (as a general class) are subject to various threats, such as eavesdropping, impersonation, denial of service, and man-in-the-middle attacks Bluetooth devices and networks are also subject to these issues In addition, Bluetooth systems face additional threats, including: Location tracking Because Bluetooth devices by their nature emit radio signals and device addresses must be both unique and known to communicating parties, Bluetooth devices are subject to location-tracking threats
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10: Bluetooth Security
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Key management issues Like many technologies that use cryptography for features such as authentication and encryption, Bluetooth devices are subject to threats related to key management, including key disclosure or tampering Bluejacking Bluejacking involves the sending of unsolicited messages to a victim s Bluetooth device This can be leveraged as a social-engineering attack that is enabled by susceptible Bluetooth devices Implementation issues As with any technology specification, the quality of security on Bluetooth devices is determined to some degree by product-specific implementations Implementation flaws become threats when a product manufacturer incorrectly implements the Bluetooth specification in its device, making the device or communications subject to security issues that would not exist if the specification was implemented correctly Implementation flaws have been at the root of many well-known Bluetooth security issues, including: Bluesnarfing This attack allows access to a victim Bluetooth device because of a flaw in device firmware Arbitrary data can be accessed through this attack, including the International Mobile Equipment Identity (IMEI) Bluebugging This attack allows an attacker to access data, place calls, and eavesdrop on calls, among other activities This attack is made possible by a firmware flaw on some mobile phones Car whispering This attack allows an attacker to send or receive audio via a Bluetooth-enabled hands-free automobile kit This attack is made possible due to an implementation flaw on these kits
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For more information on Bluetooth security issues and the listed attacks, refer to TheBunkernet (for Adam Laurie and Ben Laurie s documentation of security issues in Bluetooth) and the trifinitegroup website
Bluetooth Vulnerabilities
This section outlines a number of known security vulnerabilities in current and legacy versions of Bluetooth (see NIST Special Publication 800-121: Guide to Bluetooth Security)
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The unit key is reusable and becomes public when used The unit key is a type of link key generated during device pairing, and has been deprecated since Bluetooth v12 This issue allows arbitrary eavesdropping by devices that have access to the unit key
Bluetooth Versions Prior to v21
Short PINs are permitted Because PINs are used to generate encryption keys and users may tend to select short PINs, this issue can lower the security assurances provided by Bluetooth s encryption mechanisms The encryption keystream repeats In Bluetooth versions prior to v21, the keystream repeats after 233 hours of use Therefore, a keystream is generated identical to that used earlier in the communication
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