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Buffer Access with Incorrect Length Value in zephyr

High
ceolin published GHSA-8q65-5gqf-fmw5 Oct 5, 2021

Package

zephyr (west)

Affected versions

>=2.5.0

Patched versions

2.6.0

Description

Impact

In the process of setting SCAN_RSP through the HCI command, the Zephyr Bluetooth protocol stack did not effectively check the length of the incoming HCI data. Causes memory overflow, and then the data in the memory is overwritten, and may even cause arbitrary code execution. Detailed report PDF available.

Patches

This has been fixed in:

For more information

If you have any questions or comments about this advisory:

embargo: 2021-09-04
zepsec: ZEPSEC-153

Severity

High

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Physical
Attack complexity
High
Privileges required
None
User interaction
Required
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:P/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H

CVE ID

CVE-2021-3581

Weaknesses