Bug 1879820 (CVE-2020-9770)

Summary: CVE-2020-9770 bluez: BLESA bluetooth attack
Product: [Other] Security Response Reporter: Doran Moppert <dmoppert>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED WONTFIX QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: bnocera, darcari, dwmw2, dzickus, gtiwari, hwkernel-mgr, security-response-team, spacewar
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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Last Closed: 2021-10-28 05:02:46 UTC Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Embargoed:
Bug Depends On: 1879823, 1879824, 1882204, 1910509    
Bug Blocks: 1879782    

Description Doran Moppert 2020-09-17 06:08:21 UTC 
An authentication bypass in the Bluetooth Low Energy (BLE) protocol could enable physically proximate attackers to impersonate trusted bluetooth devices.

External references:

https://www.usenix.org/system/files/woot20-paper-wu-updated.pdf
Comment 5 Doran Moppert 2020-09-24 03:41:23 UTC 
Statement:

The research paper describes that Bluetooth Low Energy connections managed through `bluetoothctl` control or via D-Bus API are not vulnerable to this attack as they strictly follow the proactive authentication specification.  Connections that are managed by `gatttool` are among those that may be vulnerable.
Comment 6 Doran Moppert 2020-09-24 03:41:25 UTC 
Mitigation:

Bluetooth Low Energy can be disabled altogether if it is not required, using the configuration below.  This will prevent BLE devices from connecting with the host, disabling this attack

```ControllerMode=bredr```
Comment 7 Doran Moppert 2020-09-24 03:44:17 UTC 
Created bluez tracking bugs for this issue:

Affects: fedora-all [bug 1882204]