Weakness
Re-pairing with a legitimate device can use a lower security level than previous making brute-forcing the LTK easier. See V4 in the BLERP paper linked below.
References
- https://community.silabs.com/068Vm00000x0yyH
- https://docs.silabs.com/rs9116-wiseconnect/latest/wifibt-wc-release-notes/rs9116-ble-release-notes#bug-fixes
- https://docs.silabs.com/sisdk-release-notes/latest/sisdk-wifi-release-notes/sisdk-wifible-ble-release-notes
- https://www.ndss-symposium.org/ndss-paper/blerp-ble-re-pairing-attacks-and-defenses/
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