Vulnerability identifier: #VU83985
Vulnerability risk: Medium
CVSSv3.1: 6.4 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C]
CVE-ID:
CWE-ID:
CWE-20
Exploitation vector: Network
Exploit availability: No
Vulnerable software:
FreeBSD
Operating systems & Components /
Operating system
Vendor: FreeBSD Foundation
Description
The vulnerability allows a remote attacker to perform spoofing attack.
The vulnerability exists due to missing validation of TCP sequence numbers on inbound packets in pf(4). A remote attacker can guess the connection's port numbers and inject packets into existing TCP streams, resulting in spoofing attack.
This could be used to implement a denial-of-service attack for hosts behind the firewall, for example by sending TCP RST packets to the host.
Mitigation
Install updates from vendor's website.
Vulnerable software versions
FreeBSD: 12.0 - 14.0
External links
http://www.freebsd.org/security/advisories/FreeBSD-SA-23:17.pf.asc
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.