Vulnerability identifier: #VU20352

Vulnerability risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: N/A

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 bypass certain security restrictions.

The vulnerability exists due to incompatibility of firewall rules created with older versions of ipfw(8) utility that support jail keyword. The issue results in rules with the jail keyword are not applied, leading to potential unauthorized access to the services, protected by the firewall rules.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

FreeBSD: 11.3

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External links
http://www.freebsd.org/security/advisories/FreeBSD-EN-19:17.ipfw.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.