Vulnerability identifier: #VU50594

Vulnerability 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]

CVE-ID: CVE-2020-27630

CWE-ID: CWE-330

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
uC/TCP-IP
Server applications / Other server solutions

Vendor: Weston Embedded

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

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

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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.