CVE-2019-9506

Blutooth BR/EDR specification does not specify sufficient encryption key length and allows an attacker to influence key length negotiation

Description

The Bluetooth BR/EDR specification up to and including version 5.1 permits sufficiently low encryption key length and does not prevent an attacker from influencing the key length negotiation. This allows practical brute-force attacks (aka "KNOB") that can decrypt traffic and inject arbitrary ciphertext without the victim noticing.

Remediation

Workaround:

  • Bluetooth SIG Expedited Errata Correction 11838

Categories

8.1
CVSS
Severity: High
CVSS 3.1 •
CVSS 3.0 •
CVSS 2.0 •
EPSS 2.97% Top 15%
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Affected: Bluetooth BR/EDR
Published at:
Updated at:

References

Link Tags
https://www.kb.cert.org/vuls/id/918987/ third party advisory us government resource
http://www.cs.ox.ac.uk/publications/publication12404-abstract.html third party advisory
https://www.usenix.org/conference/usenixsecurity19/presentation/antonioli third party advisory
https://www.bluetooth.com/security/statement-key-negotiation-of-bluetooth/ third party advisory
http://seclists.org/fulldisclosure/2019/Aug/14 third party advisory mailing list
http://seclists.org/fulldisclosure/2019/Aug/11 third party advisory mailing list
http://seclists.org/fulldisclosure/2019/Aug/13 third party advisory mailing list
http://seclists.org/fulldisclosure/2019/Aug/15 third party advisory mailing list
http://www.huawei.com/en/psirt/security-advisories/huawei-sa-20190828-01-knob-en third party advisory
https://usn.ubuntu.com/4115-1/ third party advisory vendor advisory
https://usn.ubuntu.com/4118-1/ third party advisory vendor advisory
https://lists.debian.org/debian-lts-announce/2019/09/msg00014.html third party advisory mailing list
https://lists.debian.org/debian-lts-announce/2019/09/msg00015.html third party advisory mailing list
https://lists.debian.org/debian-lts-announce/2019/09/msg00025.html third party advisory mailing list
https://usn.ubuntu.com/4147-1/ third party advisory vendor advisory
https://access.redhat.com/errata/RHSA-2019:2975 third party advisory vendor advisory
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00037.html vendor advisory mailing list third party advisory
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00036.html vendor advisory mailing list third party advisory
https://access.redhat.com/errata/RHSA-2019:3076 third party advisory vendor advisory
https://access.redhat.com/errata/RHSA-2019:3055 third party advisory vendor advisory
https://access.redhat.com/errata/RHSA-2019:3089 third party advisory vendor advisory
https://access.redhat.com/errata/RHSA-2019:3187 third party advisory vendor advisory
https://access.redhat.com/errata/RHSA-2019:3165 third party advisory vendor advisory
https://access.redhat.com/errata/RHSA-2019:3217 third party advisory vendor advisory
https://access.redhat.com/errata/RHSA-2019:3220 third party advisory vendor advisory
https://access.redhat.com/errata/RHSA-2019:3231 third party advisory vendor advisory
https://access.redhat.com/errata/RHSA-2019:3218 third party advisory vendor advisory
https://access.redhat.com/errata/RHSA-2019:3309 third party advisory vendor advisory
https://access.redhat.com/errata/RHSA-2019:3517 third party advisory vendor advisory
https://access.redhat.com/errata/RHSA-2020:0204 third party advisory vendor advisory

Frequently Asked Questions

What is the severity of CVE-2019-9506?
CVE-2019-9506 has been scored as a high severity vulnerability.
How to fix CVE-2019-9506?
As a workaround for remediating CVE-2019-9506: Bluetooth SIG Expedited Errata Correction 11838
Is CVE-2019-9506 being actively exploited in the wild?
It is possible that CVE-2019-9506 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~3% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2019-9506?
CVE-2019-9506 affects Bluetooth BR/EDR.
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