PT-2021-2231 · Contiki · Contiki

Published 2021-03-05 · Updated 2023-10-13 · CVE-2020-27634

Positive Technologies (AI Summary)

CVSS v3.1

9.1

Critical

Base vector

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

Name of the Vulnerable Software and Affected Versions Contiki version 4.5

Description The issue is related to the improper randomness of TCP Initial Sequence Numbers (ISNs) in the Contiki OS uIP protocol stack implementation. This could allow a remote attacker to gain unauthorized access to protected information.

Recommendations For Contiki version 4.5, consider implementing additional randomness measures for TCP ISNs to mitigate the risk of exploitation. As a temporary workaround, restrict access to sensitive information until a proper fix is applied. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Use of Insufficiently Random Values

Weakness Enumeration

CWE-330

Related Identifiers

BDU:2021-01176

CVE-2020-27634

Affected Products

Contiki

References · 12

• https://nvd.nist.gov/vuln/detail/CVE-2020-27634 · Security Note
• https://bdu.fstec.ru/vul/2021-01176 · Security Note
• https://osv.dev/vulnerability/CVE-2020-27634 · Vendor Advisory
• https://securitylab.ru/vulnerability/516451.php · Note
• https://cybersecurity-help.cz/vdb/SB2021021017 · Note
• https://t.me/cvenotify/59187 · Telegram Post
• https://cisa.gov/news-events/ics-advisories/icsa-21-042-01 · Note
• https://forescout.com/company/resources/amnesia33-how-tcp-ip-stacks-breed-critical-vulnerabilities-in-iot-ot-and-it-devices · Note
• https://forescout.com/company/blog/numberjack-forescout-research-labs-finds-nine-isn-generation-vulnerabilities-affecting-tcpip-stacks · Note
• https://forescout.com/resources/numberjack-weak-isn-generation-in-embedded-tcpip-stacks · Note
• https://forescout.com · Note
• https://securitylab.ru/news/516461.php · Note