Vulnerability identifier: #VU51432

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: N/A

CWE-ID: CWE-330

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
NetBSD
Operating systems & Components / Operating system

Vendor: NetBSD Foundation, Inc

Description

The vulnerability allows a remote attacker to perform a spoofing attack.

The vulnerability exists due to IP ID randomization is not enabled by default for IPv4 and IPv6 fragments and TCP ISS random generation has an information leak. A remote attacker can analyze packets received from the system and use the obtained information to spoof packets.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

NetBSD: 8.0 - 9.1

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External links
http://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2021-001.txt.asc

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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.