Multiple vulnerabilities in FreeBSD

Published: 2023-08-02

Risk	Medium
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2023-3494 CVE-2023-3107
CWE-ID	CWE-371 CWE-190
Exploitation vector	Network
Public exploit	N/A
Vulnerable software	FreeBSD Operating systems & Components / Operating system
Vendor	FreeBSD Foundation

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) State Issues

EUVDB-ID: #VU78875

Risk: Medium

CVSSv4.0: 6.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2023-3494

CWE-ID: CWE-371 - State Issues

Exploit availability: No

Description

The vulnerability allows an attacker to escalate privileges on the system.

The vulnerability exists due to an error in the state machine implementation within the bhyve fwctl driver, which is executed when a bhyve guest accesses certain x86 I/O ports. A malicious, privileged software running in a guest VM can exploit the state issue to trigger buffer overflow and achieve code execution on the host in the bhyve userspace process.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

FreeBSD: 13.1 - 13.2

CPE2.3

External links

https://security.FreeBSD.org/advisories/FreeBSD-SA-23:07.bhyve.asc

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated privileged user via the Internet.

Is there known malware, which exploits this vulnerability?

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

2) Integer overflow

EUVDB-ID: #VU78873

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2023-3107

CWE-ID: CWE-190 - Integer overflow

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to integer overflow in the calculation of a fragment reassembled packet's payload length field when processing IPv6 traffic. A remote attacker can send specially crafted IPv6 packets to the affected system, trigger an integer overflow and perform a denial of service (DoS) attack.