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Security Advisory - Key Negotiation of Bluetooth (KNOB) Vulnerability

  • SA No:huawei-sa-20190828-01-knob
  • Initial Release Date: Aug 28, 2019
  • Last Release Date: May 27, 2020

The KNOB (Key Negotiation of Bluetooth) vulnerability exists in the encryption key negotiation process between two Bluetooth BR/EDR devices. The negotiation process is not encrypted and no authentication is performed. An unauthenticated, adjacent attacker can initiate a man-in-the-middle attack to reduce the negotiated entropy length used for secure connections to a single octet. Successful exploit could cause the encryption key being vulnerable to brute force. (Vulnerability ID: HWPSIRT-2019-08118)
This vulnerability has been assigned a Common Vulnerabilities and Exposures (CVE) ID: CVE-2019-9506.
Huawei has released software updates to fix this vulnerability. This advisory is available at the following link:
http://www.huawei.com/en/psirt/security-advisories/huawei-sa-20190828-01-knob-en

Product Name

Affected Version

Resolved Product and Version

Matebook, Magicbook series laptops

Running the affected Windows operating system

Follow the Microsoft security advisory to implement patch

ALP-AL00B

Versions earlier than 9.1.0.333(C00E333R2P1T8)

9.1.0.333(C00E333R2P1T8)

Ares-AL00B

Versions earlier than 9.1.0.160(C00E160R2P5T8)

9.1.0.160(C00E160R2P5T8)

Asoka-AL00AX

Versions earlier than 9.1.1.181(C00E48R6P1)

9.1.1.181(C00E48R6P1)

Atomu-L33

Versions earlier than 8.0.0.147(C605CUSTC605D1)

8.0.0.147(C605CUSTC605D1)

Atomu-L41

Versions earlier than 8.0.0.153(C461CUSTC461D1)

8.0.0.153(C461CUSTC461D1)

Atomu-L42

Versions earlier than 8.0.0.155(C636CUSTC636D1)

8.0.0.155(C636CUSTC636D1)

BLA-L29C

Versions earlier than 9.1.0.300(C605E2R1P12T8)

9.1.0.300(C605E2R1P12T8)

Versions earlier than 9.1.0.306(C185E2R1P13T8)

9.1.0.306(C185E2R1P13T8)

Versions earlier than 9.1.0.306(C432E4R1P11T8)

9.1.0.306(C432E4R1P11T8)

Versions earlier than 9.1.0.306(C636E2R1P13T8)

9.1.0.306(C636E2R1P13T8)

Versions earlier than 9.1.0.307(C635E4R1P13T8)

9.1.0.307(C635E4R1P13T8)

Barca-AL00

Versions earlier than 8.0.0.366(C00)

8.0.0.366(C00)

Berkeley-AL20

Versions earlier than 9.1.0.333(C00E333R2P1T8)

9.1.0.333(C00E333R2P1T8)

Berkeley-L09

Versions earlier than 9.1.0.332(C432E5R1P13T8)

9.1.0.332(C432E5R1P13T8)

Versions earlier than 9.1.0.350(C10E3R1P14T8)

9.1.0.350(C10E3R1P14T8)

Versions earlier than 9.1.0.350(C636E4R1P13T8)

9.1.0.350(C636E4R1P13T8)

Charlotte-L29C

Versions earlier than 9.1.0.311(C605E2R1P11T8)

9.1.0.311(C605E2R1P11T8)

Versions earlier than 9.1.0.325(C185E4R1P11T8)

9.1.0.325(C185E4R1P11T8)

Versions earlier than 9.1.0.325(C636E2R1P12T8)

9.1.0.325(C636E2R1P12T8)

Versions earlier than 9.1.0.328(C432E5R1P9T8)

9.1.0.328(C432E5R1P9T8)

Versions earlier than 9.1.0.328(C782E10R1P9T8)

9.1.0.328(C782E10R1P9T8)

Columbia-AL10B

Versions earlier than 9.1.0.333(C00E333R1P1T8)

9.1.0.333(C00E333R1P1T8)

Columbia-L29D

Versions earlier than 9.1.0.350(C10E5R1P14T8)

9.1.0.350(C10E5R1P14T8)

Versions earlier than 9.1.0.350(C185E3R1P12T8)

9.1.0.350(C185E3R1P12T8)

Versions earlier than 9.1.0.350(C461E3R1P11T8)

9.1.0.350(C461E3R1P11T8)

Versions earlier than 9.1.0.350(C636E3R1P13T8)

9.1.0.350(C636E3R1P13T8)

Versions earlier than 9.1.0.351(C432E5R1P13T8)

9.1.0.351(C432E5R1P13T8)

Cornell-AL00A

Versions earlier than 9.1.0.333(C00E333R1P1T8)

9.1.0.333(C00E333R1P1T8)

Cornell-L29A

Versions earlier than 9.1.0.336(C636E2R1P12T8)

9.1.0.336(C636E2R1P12T8)

Versions earlier than 9.1.0.341(C185E1R1P9T8)

9.1.0.341(C185E1R1P9T8)

Versions earlier than 9.1.0.342(C461E1R1P9T8)

9.1.0.342(C461E1R1P9T8)

Versions earlier than 9.1.0.347(C432E1R1P9T8)

9.1.0.347(C432E1R1P9T8)

Dura-AL00A

Versions earlier than 1.0.0.182(C00)

1.0.0.182(C00)

Emily-L29C

Versions earlier than 9.1.0.311(C461E2R1P11T8)

9.1.0.311(C461E2R1P11T8)

Versions earlier than 9.1.0.325(C185E2R1P12T8)

9.1.0.325(C185E2R1P12T8)

Versions earlier than 9.1.0.325(C605E2R1P11T8)

Emily-L09C 9.1.0.325(C605E2R1P11T8)

Versions earlier than 9.1.0.325(C636E7R1P13T8)

9.1.0.325(C636E7R1P13T8)

Versions earlier than 9.1.0.326(C635E2R1P11T8)

9.1.0.326(C635E2R1P11T8)

Versions earlier than 9.1.0.328(C432E7R1P11T8)

9.1.0.328(C432E7R1P11T8)

Ever-L29B

Versions earlier than 9.1.0.338(C185E3R3P1)

9.1.0.338(C185E3R3P1)

Figo-L23

Versions earlier than 9.1.0.160(C605E6R1P5T8)

9.1.0.160(C605E6R1P5T8)

Figo-L31

Versions earlier than 9.1.0.158(C432E8R1P5T8)

9.1.0.158(C432E8R1P5T8)

Florida-AL20B

Versions earlier than 9.1.0.128(C00E112R1P6T8)

9.1.0.128(C00E112R1P6T8)

Florida-L21

Versions earlier than 9.1.0.150(C185E6R1P5T8)

9.1.0.150(C185E6R1P5T8)

Versions earlier than 9.1.0.150(C432E6R1P5T8)

9.1.0.150(C432E6R1P5T8)

Florida-L22

Versions earlier than 9.1.0.150(C636E6R1P5T8)

9.1.0.150(C636E6R1P5T8)

Florida-L23

Versions earlier than 9.1.0.154(C605E7R1P2T8)

9.1.0.154(C605E7R1P2T8)

HONOR 20 PRO

Versions earlier than 9.1.0.154(C185E2R5P1)

9.1.0.154(C185E2R5P1)

Versions earlier than 9.1.0.154(C432E2R5P1)

9.1.0.154(C432E2R5P1)

Versions earlier than 9.1.0.154(C636E2R3P1)

9.1.0.154(C636E2R3P1)

Versions earlier than 9.1.0.170(C185E2R5P1)

9.1.0.170(C185E2R5P1)

Versions earlier than 9.1.0.170(C636E2R3P1)

9.1.0.170(C636E2R3P1)

Versions earlier than 9.1.0.172(C432E2R5P1)

9.1.0.172(C432E2R5P1)

HUAWEI Mate 20

Versions earlier than 9.1.0.135(C00E133R3P1)

9.1.0.135(C00E133R3P1)

Versions earlier than 9.1.0.139(C00E133R3P1)

9.1.0.139(C00E133R3P1)

HUAWEI Mate 20 Pro

Versions earlier than 9.1.0.333(C605E10R1P16)

9.1.0.333(C605E10R1P16)

Versions earlier than 9.1.0.338(C185E10R2P1)

9.1.0.338(C185E10R2P1)

Versions earlier than 9.1.0.338(C432E10R1P16)

9.1.0.338(C432E10R1P16)

Versions earlier than 9.1.0.338(C461E10R1P16)

9.1.0.338(C461E10R1P16)

Versions earlier than 9.1.0.338(C605E10R1P16)

9.1.0.338(C605E10R1P16)

Versions earlier than 9.1.0.338(C635E12R1P16)

9.1.0.338(C635E12R1P16)

Versions earlier than 9.1.0.342(C10E10R2P1)

9.1.0.342(C10E10R2P1)

HUAWEI Mate 20 X

Versions earlier than 9.1.0.135(C00E133R2P1)

9.1.0.135(C00E133R2P1)

Versions earlier than 9.1.0.139(C00E133R2P1)

9.1.0.139(C00E133R2P1)

HUAWEI P smart

Versions earlier than 9.1.0.160(ZAFC185E6R1P5T8)

9.1.0.160(ZAFC185E6R1P5T8)

HUAWEI P smart 2019

Versions earlier than 9.1.0.289(C605E8R2P2)

9.1.0.289(C605E8R2P2)

Versions earlier than 9.1.0.291(C185E8R4P1)

9.1.0.291(C185E8R4P1)

Versions earlier than 9.1.0.293(C432E8R4P1)

9.1.0.293(C432E8R4P1)

HUAWEI P20

Versions earlier than 9.1.0.333(C00E333R1P1T8)

9.1.0.333(C00E333R1P1T8)

HUAWEI P30

Versions earlier than 9.1.0.226(C00E220R2P1)

9.1.0.226(C00E220R2P1)

Versions earlier than 9.1.0.240(C431E4R3P2)

9.1.0.240(C431E4R3P2)

Versions earlier than 9.1.0.240(C432E4R2P2)

9.1.0.240(C432E4R2P2)

Versions earlier than 9.1.0.240(C636E4R3P2)

9.1.0.240(C636E4R3P2)

Versions earlier than 9.1.0.241(C316E10R1P11)

9.1.0.241(C316E10R1P11)

Versions earlier than 9.1.0.241(C461E4R3P1)

9.1.0.241(C461E4R3P1)

Versions earlier than 9.1.0.241(C605E5R1P11)

9.1.0.241(C605E5R1P11)

Versions earlier than 9.1.0.241(C636E4R3P2)

9.1.0.241(C636E4R3P2)

Versions earlier than 9.1.0.242(C185E4R7P1)

9.1.0.242(C185E4R7P1)

HUAWEI P30 Pro

Versions earlier than 9.1.0.226(C00E210R2P1)

9.1.0.226(C00E210R2P1)

HUAWEI Y5 2018

Versions earlier than 1.0.0.154(C432)

1.0.0.154(C432)

HUAWEI Y5 lite

Versions earlier than 1.0.0.134(C636)

1.0.0.134(C636)

HUAWEI Y6 2019

Versions earlier than 9.1.0.234(C782E11R1P7)

9.1.0.234(C782E11R1P7)

Versions earlier than 9.1.0.248(C185E5R4P1)

9.1.0.248(C185E5R4P1)

Versions earlier than 9.1.0.248(C605E6R1P6)

9.1.0.248(C605E6R1P6)

Versions earlier than 9.1.0.248(C605E6R1P7)

9.1.0.248(C605E6R1P7)

Versions earlier than 9.1.0.252(C432E5R2P1)

9.1.0.252(C432E5R2P1)

HUAWEI Y6 Prime 2018

Versions earlier than 8.0.0.151(C318CUSTC318D1)

8.0.0.151(C318CUSTC318D1)

Versions earlier than 8.0.0.153(C569CUSTC569D1)

8.0.0.153(C569CUSTC569D1)

Versions earlier than 8.0.0.157(C185CUSTC185D1)

8.0.0.157(C185CUSTC185D1)

HUAWEI Y6 Pro 2019

Versions earlier than 9.1.0.248(C636E5R3P1)

9.1.0.248(C636E5R3P1)

HUAWEI Y7 2019

Versions earlier than 8.2.0.147(C605CUSTC605D1)

8.2.0.147(C605CUSTC605D1)

Versions earlier than 8.2.0.148(C605CUSTC605D1)

8.2.0.148(C605CUSTC605D1)

HUAWEI Y9 2019

Versions earlier than 9.1.0.233(C185E2R5P1T8)

9.1.0.233(C185E2R5P1T8)

Versions earlier than 9.1.0.233(C605E4R1P1T8)

9.1.0.233(C605E4R1P1T8)

HUAWEI nova 3

Versions earlier than 9.1.0.333(C00E333R1P1T8)

9.1.0.333(C00E333R1P1T8)

Versions earlier than 9.1.0.346(C318E1R1P3T8)

9.1.0.346(C318E1R1P3T8)

HUAWEI nova 4

Versions earlier than 9.1.0.223(C185E1R1P1)

9.1.0.223(C185E1R1P1)

Versions earlier than 9.1.0.223(C636E1R4P1)

9.1.0.223(C636E1R4P1)

HUAWEI nova lite 3

Versions earlier than 9.1.0.283(C635E8R2P2)

9.1.0.283(C635E8R2P2)

Harry-AL00C

Versions earlier than 9.1.0.228(C00E225R3P1)

9.1.0.228(C00E225R3P1)

Harry-AL10B

Versions earlier than 9.1.0.228(C00E225R3P1)

9.1.0.228(C00E225R3P1)

Hima-L29C

Versions earlier than 9.1.0.338(C185E10R2P1)

9.1.0.338(C185E10R2P1)

Versions earlier than 9.1.0.342(C636E10R2P1)

9.1.0.342(C636E10R2P1)

Honor 10 Lite

Versions earlier than 9.1.0.266(C636E8R4P1)

9.1.0.266(C636E8R4P1)

Versions earlier than 9.1.0.273(C185E8R4P1)

9.1.0.273(C185E8R4P1)

Versions earlier than 9.1.0.273(C605E8R2P2)

9.1.0.273(C605E8R2P2)

Versions earlier than 9.1.0.280(C461E8R1P11)

9.1.0.280(C461E8R1P11)

Honor 8A

Versions earlier than 9.1.0.256(C636E4R4P1)

9.1.0.256(C636E4R4P1)

Versions earlier than 9.1.0.258(C605E4R4P2)

9.1.0.258(C605E4R4P2)

Versions earlier than 9.1.0.266(C432E5R2P1)

9.1.0.266(C432E5R2P1)

Versions earlier than 9.1.0.273(C185E3R4P1)

9.1.0.273(C185E3R4P1)

Honor 8X

Versions earlier than 9.1.0.261(C185E3R6P2T8)

9.1.0.261(C185E3R6P2T8)

Versions earlier than 9.1.0.266(C432E1R3P2T8)

9.1.0.266(C432E1R3P2T8)

Versions earlier than 9.1.0.272(C605E1R1P1T8)

9.1.0.272(C605E1R1P1T8)

Honor View 10

Versions earlier than 9.0.0.240(C567E6R1P12T8)

9.0.0.240(C567E6R1P12T8)

Jakarta-AL00A

Versions earlier than 9.1.0.248(C00E106R2P2)

9.1.0.248(C00E106R2P2)

Versions earlier than 9.1.0.257(C636E2R1P11)

9.1.0.257(C636E2R1P11)

Johnson-TL00F

Versions earlier than 9.1.0.239(C541E1R1P1T8)

9.1.0.239(C541E1R1P1T8)

Katyusha-AL00A

Versions earlier than 9.1.0.141(C00E131R2P2)

9.1.0.141(C00E131R2P2)

Laya-AL00EP

Versions earlier than 9.1.0.135(C786E133R3P1)

9.1.0.135(C786E133R3P1)

Versions earlier than 9.1.0.139(C786E133R3P1)

9.1.0.139(C786E133R3P1)

Leland-L21A

Versions earlier than 9.1.0.156(C185E5R1P5T8)

9.1.0.156(C185E5R1P5T8)

Leland-L31A

Versions earlier than 9.1.0.155(C432E6R1P4T8)

9.1.0.155(C432E6R1P4T8)

LelandP-AL00C

Versions earlier than 9.1.0.115(C00E113R1P6T8)

9.1.0.115(C00E113R1P6T8)

LelandP-AL10B

Versions earlier than 9.1.0.115(C00E113R1P6T8)

9.1.0.115(C00E113R1P6T8)

LelandP-AL10D

Versions earlier than 9.1.0.115(C00E113R1P6T8)

9.1.0.115(C00E113R1P6T8)

Madrid-AL00A

Versions earlier than 9.1.0.261(C00E120R4P1)

9.1.0.261(C00E120R4P1)

Paris-L21B

Versions earlier than 9.1.0.346(C432E1R1P2T8)

9.1.0.346(C432E1R1P2T8)

Paris-L21MEB

Versions earlier than 9.1.0.346(C185E4R1P3T8)

9.1.0.346(C185E4R1P3T8)

Paris-L29B

Versions earlier than 9.1.0.346(C636E1R1P3T8)

9.1.0.346(C636E1R1P3T8)

Potter-AL00C

Versions earlier than 9.1.0.239(C00E229R4P1)

9.1.0.239(C00E229R4P1)

Potter-AL10A

Versions earlier than 9.1.0.239(C00E229R3P1)

9.1.0.239(C00E229R3P1)

Princeton-AL10B

Versions earlier than 9.1.0.247(C00E233R4P3)

9.1.0.247(C00E233R4P3)

Princeton-AL10D

Versions earlier than 10.0.0.188(C00E62R2P11)

10.0.0.188(C00E62R2P11)

Versions earlier than 9.1.0.248(C00E234R4P3)

9.1.0.248(C00E234R4P3)

Sydney-AL00

Versions earlier than 9.1.0.235(C00E78R1P7T8)

9.1.0.235(C00E78R1P7T8)

Sydney-L21

Versions earlier than 9.1.0.264(C432E1R1P1T8)

Sydney-L21D 9.1.0.264(C432E1R1P1T8)

Versions earlier than 9.1.0.265(C185E1R1P1T8)

9.1.0.265(C185E1R1P1T8)

Sydney-L21BR

Versions earlier than 9.1.0.246(C185E1R1P2T8)

9.1.0.246(C185E1R1P2T8)

Sydney-L22

Versions earlier than 9.1.0.267(C636E1R1P1T8)

9.1.0.267(C636E1R1P1T8)

Sydney-L22BR

Versions earlier than 9.1.0.258(C636E1R1P1T8)

9.1.0.258(C636E1R1P1T8)

SydneyM-AL00

Versions earlier than 9.1.0.233(C00E78R1P7T8)

9.1.0.233(C00E78R1P7T8)

SydneyM-L01

Versions earlier than 9.1.0.285(C185E1R1P1T8)

9.1.0.285(C185E1R1P1T8)

Versions earlier than 9.1.0.291(C432E3R1P1T8)

9.1.0.291(C432E3R1P1T8)

Versions earlier than 9.1.0.291(C782E2R1P1T8)

9.1.0.291(C782E2R1P1T8)

SydneyM-L03

Versions earlier than 9.1.0.257(C605E1R1P1T8)

9.1.0.257(C605E1R1P1T8)

SydneyM-L21

Versions earlier than 9.1.0.265(C461E1R1P1T8)

9.1.0.265(C461E1R1P1T8)

Versions earlier than 9.1.0.266(C432E4R1P1T8)

9.1.0.266(C432E4R1P1T8)

SydneyM-L22

Versions earlier than 9.1.0.246(C569E1R1P1T8)

9.1.0.246(C569E1R1P1T8)

Versions earlier than 9.1.0.250(C185E1R1P2T8)

9.1.0.250(C185E1R1P2T8)

Versions earlier than 9.1.0.264(C635E1R1P2T8)

9.1.0.264(C635E1R1P2T8)

SydneyM-L23

Versions earlier than 9.1.0.295(C605E2R1P1T8)

9.1.0.295(C605E2R1P1T8)

Tony-AL00B

Versions earlier than 10.0.0.175(C00E59R2P11)

10.0.0.175(C00E59R2P11)

Versions earlier than 9.1.0.254(C00E222R2P1)

9.1.0.254(C00E222R2P1)

Yale-AL00A

Versions earlier than 9.1.0.152(C00E150R5P1)

9.1.0.152(C00E150R5P1)

Versions earlier than 9.1.0.179(C00E179R8P2)

9.1.0.179(C00E179R8P2)

Yale-AL50A

Versions earlier than 9.1.1.151(C00E150R6P3)

9.1.1.151(C00E150R6P3)

Versions earlier than 9.1.1.158(C00E156R8P2)

9.1.1.158(C00E156R8P2)

Yale-L21A

Versions earlier than 9.1.0.154(C10E2R3P1)

9.1.0.154(C10E2R3P1)

Versions earlier than 9.1.0.154(C431E2R5P1)

9.1.0.154(C431E2R5P1)

Versions earlier than 9.1.0.154(C432E2R5P1)

9.1.0.154(C432E2R5P1)

Versions earlier than 9.1.0.154(C461E2R3P1)

9.1.0.154(C461E2R3P1)

Versions earlier than 9.1.0.154(C605E2R4P1)

9.1.0.154(C605E2R4P1)

Versions earlier than 9.1.0.154(C636E2R3P1)

9.1.0.154(C636E2R3P1)

Versions earlier than 9.1.0.170(C461E2R3P1)

9.1.0.170(C461E2R3P1)

Versions earlier than 9.1.0.170(C636E2R3P1)

9.1.0.170(C636E2R3P1)

Versions earlier than 9.1.0.171(C10E2R3P1)

9.1.0.171(C10E2R3P1)

Versions earlier than 9.1.0.172(C432E2R5P1)

9.1.0.172(C432E2R5P1)

Yale-L61C

Versions earlier than 9.1.0.185(C185E2R2P1)

9.1.0.185(C185E2R2P1)

YaleP-AL10B

Versions earlier than 9.1.0.152(C00E150R5P1)

9.1.0.152(C00E150R5P1)

Versions earlier than 9.1.0.179(C00E179R8P2)

9.1.0.179(C00E179R8P2)



Successful exploit could cause the encryption key being vulnerable to brute force.

The vulnerability classification has been performed by using the CVSSv3 scoring system (http://www.first.org/cvss/specification-document).

Base Score: 8.0 (AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N)

Temporal Score: 7.4 (E:F/RL:O/RC:C)

This vulnerability can be exploited only when the following conditions are present: 

The attacker gains access to the device network. 

Vulnerability details: 

The KNOB (Key Negotiation of Bluetooth) vulnerability exists in the encryption key negotiation process between two Bluetooth BR/EDR devices. The negotiation process is not encrypted and no authentication is performed. An unauthenticated, adjacent attacker can initiate a man-in-the-middle attack to reduce the negotiated entropy length used for secure connections to a single octet. Successful exploit could cause the encryption key being vulnerable to brute force.

1.For Matebook, Magicbook series laptops, follow the Microsoft security advisories to implement patch.

2.The product that supports automatic update will receive a system update prompt. You can install the update to fix the vulnerability.

This vulnerability was reported by CERT/CC.

2020-05-27 V1.5 UPDATED Updated the affected version and fix version information
2020-04-22 V1.4 UPDATED Updated the affected version and fix version information

2020-04-01 V1.3 UPDATED Updated the affected version and fix version information

2020-02-19 V1.2 UPDATED Updated the affected version and fix version information

2019-11-13 V1.1 UPDATED Updated the affected version and fix version information

2019-08-28 V1.0 INITIAL

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