Advisory Details

September 20th, 2022

FreeBSD Kernel Netmap Time-Of-Check Time-Of-Use Privilege Escalation Vulnerability

CVE ID	CVE-2022-23084
CVSS SCORE	8.2, AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
AFFECTED VENDORS	FreeBSD
AFFECTED PRODUCTS	Kernel
VULNERABILITY DETAILS	This vulnerability allows local attackers to escalate privileges on affected installations of FreeBSD Kernel. An attacker must first obtain the ability to execute high-privileged code on the target system in order to exploit this vulnerability. The specific flaw exists within the handling of arguments to the Netmap device. The issue results from the lack of proper locking when performing operations on an object. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of the kernel.
ADDITIONAL DETAILS	FreeBSD has issued an update to correct this vulnerability. More details can be found at: https://www.freebsd.org/security/advisories/FreeBSD-SA-22:04.netmap.asc
DISCLOSURE TIMELINE	2022-02-18 - Vulnerability reported to vendor 2022-09-20 - Coordinated public release of advisory
CREDIT	Lucas Leong (@_wmliang_) of Trend Micro Zero Day Initiative

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