PT-2021-20542 · Zephyr · Zephyr

3Zd3Z · Published 2021-10-19 · Updated 2021-10-26 · CVE-2021-3455

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions: Zephyr versions 2.4.0 and later Zephyr versions 2.5.0 and later

Description: Disconnecting L2CAP channel right after an invalid ATT request can cause a freeze. The issue is related to a Use After Free condition.

Recommendations: For Zephyr versions 2.4.0 and later, consider disabling the L2CAP channel functionality until a patch is available. For Zephyr versions 2.5.0 and later, restrict access to the ATT request module to minimize the risk of exploitation. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

CVE-2021-3455

GHSA-7G38-3X9V-V7VP

Affected Products

Zephyr

References · 4

• 🔥 http://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-7g38-3x9v-v7vp · Exploit
• https://osv.dev/vulnerability/CVE-2021-3455 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-3455 · Security Note
• https://t.me/cibsecurity/30848 · Telegram Post