PT-2020-15952 · Nut/Os · Ethernut

Published 2020-12-11 · Updated 2020-12-15 · CVE-2020-25110

Positive Technologies (AI Summary)

CVSS v3.1

9.8

Critical

Base vector

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

Name of the Vulnerable Software and Affected Versions Ethernut in Nut/OS version 5.1

Description An issue in the DNS implementation may lead to successful Denial-of-Service, and possibly Remote Code Execution, due to the length byte of a domain name in a DNS query/response not being checked and being used for internal memory operations.

Recommendations For Ethernut in Nut/OS version 5.1, consider implementing checks on the length byte of domain names in DNS queries/responses to prevent potential Denial-of-Service and Remote Code Execution attacks. As a temporary workaround, restrict DNS query/response handling to minimize the risk of exploitation. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Out of bounds Read

Weakness Enumeration

CWE-125

Related Identifiers

CVE-2020-25110

Affected Products

Ethernut

References · 5

• https://nvd.nist.gov/vuln/detail/CVE-2020-25110 · Security Note
• https://osv.dev/vulnerability/CVE-2020-25110 · Vendor Advisory
• https://t.me/cvenotify/7077 · Telegram Post
• https://us-cert.cisa.gov/ics/advisories/icsa-20-343-01 · Note
• https://kb.cert.org/vuls/id/815128 · Note