Vulnerability identifier: #VU50599

Vulnerability risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-27635

CWE-ID: CWE-330

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
PicoTCP
Server applications / Other server solutions
PicoTCP-NG
Server applications / Other server solutions

Vendor: Altran EESY

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
Install updates from vendor's website.

Vulnerable software versions

PicoTCP: 1.7.0

PicoTCP-NG: All versions

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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.