#VU41112 Out-of-bounds write in zephyr - CVE-2020-10021

Vulnerability identifier: #VU41112

Vulnerability risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-10021

CWE-ID: CWE-787

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
zephyr
Other software / Other software solutions

Vendor: rutantan

Description

The vulnerability allows a local authenticated user to execute arbitrary code.

Out-of-bounds Write in the USB Mass Storage memoryWrite handler with unaligned Sizes See NCC-ZEP-024, NCC-ZEP-025, NCC-ZEP-026 This issue affects: zephyrproject-rtos zephyr version 1.14.1 and later versions. version 2.1.0 and later versions.

Mitigation
Install update from vendor's website.

Vulnerable software versions

zephyr: 2.1.0

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External links
https://docs.zephyrproject.org/latest/security/vulnerabilities.html#cve-2020-10021
https://github.com/zephyrproject-rtos/zephyr/pull/23240
https://github.com/zephyrproject-rtos/zephyr/pull/23455
https://github.com/zephyrproject-rtos/zephyr/pull/23456
https://zephyrprojectsec.atlassian.net/browse/ZEPSEC-26

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.