Spoofing attack in NetBSD

1) Use of insufficiently random values

EUVDB-ID: #VU51432

Risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: N/A

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

Exploit availability: No

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

CPE2.3

• cpe:2.3:o:netbsd_foundation:netbsd:8.0:*:*:*:*:*:*:*
• cpe:2.3:o:netbsd_foundation:netbsd:8.1:*:*:*:*:*:*:*
• cpe:2.3:o:netbsd_foundation:netbsd:8.2:*:*:*:*:*:*:*

External links

https://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2021-001.txt.asc

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.