An issue was discovered in Ethernut Nut/OS 5.1. The code that generates Initial Sequence Numbers (ISNs) for TCP connections derives the ISN from an insufficiently random source. As a result, an attacker may be able to determine the ISN of current and future TCP connections and either hijack existing ones or spoof future ones. While the ISN generator seems to adhere to RFC 793 (where a global 32-bit counter is incremented roughly every 4 microseconds), proper ISN generation should aim to follow at least the specifications outlined in RFC 6528.
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History
Thu, 19 Sep 2024 16:30:00 +0000
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MITRE
Status: PUBLISHED
Assigner: mitre
Published: 2023-10-10T00:00:00
Updated: 2024-09-19T15:40:41.539Z
Reserved: 2020-10-19T00:00:00
Link: CVE-2020-27213
Vulnrichment
Updated: 2024-08-04T16:11:35.970Z
NVD
Status : Analyzed
Published: 2023-10-10T17:15:10.337
Modified: 2023-10-27T19:34:58.647
Link: CVE-2020-27213
Redhat
No data.