[Backport v1.14-branch] Bluetooth: Host: Fix checking for sufficient encryption key size #18702
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added 2 commits
August 27, 2019 10:30
In case sufficient security level wasn't reached the error propagation was missing, which could lead to incorrect state transitions when update_sec_level_br() returns. Return true/false and make sure to abort any further operations in case the update fails. Signed-off-by: Johan Hedberg <[email protected]>
A security vulnerability in the Bluetooth BR/EDR Bluetooth Core specification versions 1.0 through 5.1 has been identified as CVE-2019-9506. The Bluetooth BR/EDR encryption key negotiation protocol is vulnerable to packet injection that could allow an unauthenticated user to decrease the size of the entropy of the encryption key, potentially causing information disclosure and/or escalation of privileges via adjacent access. There is not currently any knowledge of this being exploited. From Core spec erratum 11838: A device shall enforce an encryption key with at least 128-bit equivalent strength for all services that require Security Mode 4, Level 4. For all other services that require encryption, a device should enforce an encryption key with at least 56-bit equivalent strength, irrespective of whether the remote device supports Secure Simple Pairing. After encryption has been enabled, the Host should check the encryption key size using either the HCI_Read_Encryption_Key_Size command (see [Vol 2] Part E, Section 7.5.7) or a vendor-specific method. Fixes #18658 Signed-off-by: Johan Hedberg <[email protected]>
backporting
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jhedberg
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Aug 27, 2019
jhedberg
added
area: Bluetooth
area: Security
nashif
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Aug 29, 2019
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Backport #18659.