Use of insufficiently random values in Nut/Net



Published: 2021-02-10
Risk Medium
Patch available NO
Number of vulnerabilities 1
CVE ID CVE-2020-27213
CWE ID CWE-330
Exploitation vector Network
Public exploit N/A
Vulnerable software
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Nut/Net
Server applications / Other server solutions

Vendor ethernut

Security Advisory

This security advisory describes one medium risk vulnerability.

1) Use of insufficiently random values

Risk: Medium

CVSSv3.1: 6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N/E:U/RL:U/RC:C] [PCI]

CVE-ID: CVE-2020-27213

CWE-ID: CWE-330 - Use of Insufficiently Random Values

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise the target system.

The vulnerability exists due to the ISN generator relies on a highly predictable source (system timer) and has constant increments. A remote attacker can interfere with traffic, spoof the connection and gain access to sensitive information.  

Mitigation

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

Nut/Net: 5.1

CPE External links

https://www.forescout.com/company/blog/numberjack-forescout-research-labs-finds-nine-isn-generation-vulnerabilities-affecting-tcpip-stacks/

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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



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