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CVE-2020-26558

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Date: May 24, 2021

Bluetooth LE and BR/EDR secure pairing in Bluetooth Core Specification 2.1 through 5.2 may permit a nearby man-in-the-middle attacker to identify the Passkey used during pairing (in the Passkey authentication procedure) by reflection of the public key and the authentication evidence of the initiating device, potentially permitting this attacker to complete authenticated pairing with the responding device using the correct Passkey for the pairing session. The attack methodology determines the Passkey value one bit at a time.

Language: C

Severity Score

Related Resources (17)

https://www.debian.org/security/2021/dsa-4951
https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00517.html
https://security.gentoo.org/glsa/202209-16
https://nvd.nist.gov/vuln/detail/CVE-2020-26558
https://access.redhat.com/security/cve/CVE-2020-26558
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NSS6CTGE4UGTJLCOZOASDR3T3SLL6QJZ/
https://lists.debian.org/debian-lts-announce/2021/06/msg00022.html
https://lists.debian.org/debian-lts-announce/2021/06/msg00019.html
https://people.canonical.com/~ubuntu-security/cve/CVE-2020-26558
https://www.bluetooth.com/learn-about-bluetooth/key-attributes/bluetooth-security/reporting-security/
https://lists.debian.org/debian-lts-announce/2021/06/msg00020.html
https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00520.html
https://security-tracker.debian.org/tracker/CVE-2020-26558
https://kb.cert.org/vuls/id/799380
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/NSS6CTGE4UGTJLCOZOASDR3T3SLL6QJZ/
https://github.com/espressif/esp-idf/commit/d73ebb570bcc2d529b0ff64d97804b70723fbb99
https://www.mend.io/vulnerability-database/CVE-2020-26558

Severity Score

Weakness Type (CWE)

Authentication Issues

CWE-287

Top Fix

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CVSS v3.1

Base Score:
Attack Vector (AV): ADJACENT_NETWORK
Attack Complexity (AC): HIGH
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): LOW
Integrity (I): LOW
Availability (A): NONE

CVSS v2

Base Score:
Access Vector (AV): ADJACENT
Access Complexity (AC): MEDIUM
Authentication (AU): NONE
Confidentiality (C): PARTIAL
Integrity (I): PARTIAL
Availability (A): NONE
Additional information:

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