Vulnerability identifier: #VU46741

Vulnerability risk: Medium

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

CVE-ID: CVE-2020-7464

CWE-ID: CWE-20

Exploitation vector: Local network

Exploit availability: No

Vulnerable software:
FreeBSD
Operating systems & Components / Operating system

Vendor: FreeBSD Foundation

Description

The vulnerability allows a remote attacker to bypass implemented security restrictions.

The vulnerability exists due to insufficient validation of user-supplied input in ure(3) device driver for certain Realtek USB Ethernet interfaces when processing network packets larger than 2048 bytes. A remote attacker can send large frames (these can be VLAN or non-VLAN tagged packet) to the affected host and inject arbitrary packets to be received and processed by the host. As a result, an attacker can spoof packets from other hosts or inject packets into other VLANs than the host is on.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

FreeBSD: 11.0 - 12.2

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External links
http://www.freebsd.org/security/advisories/FreeBSD-SA-20:27.ure.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 local network (LAN).

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.