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-2020-27630

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 LCG, which is reversible from observed output streams. 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

uC/TCP-IP: 3.6.0

CPE

• cpe:2.3:a:weston_embedded:uc\/tcp-ip:3.6.0:*:*:*:*::*:*

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.