FreeBSD Netmap Kernel overflow triggers memory corruption
CVE-2022-23085 Published on February 15, 2024
A user-provided integer option was passed to nmreq_copyin() without checking if it would overflow. This insufficient bounds checking could lead to kernel memory corruption. On systems configured to include netmap in their devfs_ruleset, a privileged process running in a jail can affect the host environment.
Vulnerability Analysis
CVE-2022-23085 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to be critical as this vulnerability has a high impact to the confidentiality, integrity and availability of this component.
Weakness Type
What is a Classic Buffer Overflow Vulnerability?
The program copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. A buffer overflow condition exists when a program attempts to put more data in a buffer than it can hold, or when a program attempts to put data in a memory area outside of the boundaries of a buffer. The simplest type of error, and the most common cause of buffer overflows, is the "classic" case in which the program copies the buffer without restricting how much is copied. Other variants exist, but the existence of a classic overflow strongly suggests that the programmer is not considering even the most basic of security protections.
CVE-2022-23085 has been classified to as a Classic Buffer Overflow vulnerability or weakness.
Products Associated with CVE-2022-23085
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Affected Versions
FreeBSD:- Version 13.1-RC1 and below p1 is affected.
- Version 13.0-RELEASE and below p11 is affected.
- Version 12.3-RELEASE and below p5 is affected.
- Version 13.0 and below 13.0_p11 is affected.
- Version 12.3 and below 12.3_p5 is affected.
- Version 13.1 and below 13.1-rc-p is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.