Improper Certificate Validation in zephyr - CVE-2020-10059
Published: May 12, 2020 / Updated: August 8, 2020
Vulnerability identifier: #VU34396
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2020-10059
CWE-ID: CWE-295
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: rutantan
Affected software:
zephyr
zephyr
Detailed vulnerability description
The vulnerability allows a remote non-authenticated attacker to #BASIC_IMPACT#.
The UpdateHub module disables DTLS peer checking, which allows for a man in the middle attack. This is mitigated by firmware images requiring valid signatures. However, there is no benefit to using DTLS without the peer checking. See NCC-ZEP-018 This issue affects: zephyrproject-rtos zephyr version 2.1.0 and later versions.
How to mitigate CVE-2020-10059
Install update from vendor's website.
Sources
- https://docs.zephyrproject.org/latest/security/vulnerabilities.html#cve-2020-10059
- https://github.com/zephyrproject-rtos/zephyr/pull/24954
- https://github.com/zephyrproject-rtos/zephyr/pull/24997
- https://github.com/zephyrproject-rtos/zephyr/pull/24999
- https://zephyrprojectsec.atlassian.net/browse/ZEPSEC-36