Privilege escalation in FreeBSD

1) Resource management error

EUVDB-ID: #VU28929

Risk: Low

CVSSv4.0: 4 [CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-7456

CWE-ID: CWE-399 - Resource Management Errors

Exploit availability: No

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to improper management of internal resources. The the push/pop level is not restored within the processing of the same HID item, an invalid memory location may be used for subsequent HID item processing. An attacker with physical access to a USB port may be able to use a specially crafted USB device to gain kernel or user-space code execution.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

FreeBSD: 11.0 - 12.1

CPE2.3

• cpe:2.3:o:freebsd_foundation:freebsd:11.0:*:*:*:*:*:*:*
• cpe:2.3:o:freebsd_foundation:freebsd:11.1:*:*:*:*:*:*:*
• cpe:2.3:o:freebsd_foundation:freebsd:11.2:*:*:*:*:*:*:*

External links

https://security.FreeBSD.org/advisories/FreeBSD-SA-20:17.usb.asc

Q & A

Can this vulnerability be exploited remotely?

No. The attacker should have physical access to the system in order to successfully exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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