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CVE-2023-3494— bhyve privileged guest escape via fwctl

Quick assessment

Affected
FreeBSD FreeBSD
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

FreeBSD是FreeBSD基金会的一套类Unix操作系统。 FreeBSD 13.1版本和13.2版本存在安全漏洞，该漏洞源于fwctl driver状态机存在缓冲区溢出漏洞。攻击者可利用该漏洞在主机的bhyve用户空间进程中以root身份执行任意代码。

AI Predicted 7.8 Difficulty: Moderate EPSS 0.23% · P13
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I. Basic Information for CVE-2023-3494

Vulnerability Information
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Vulnerability Title
bhyve privileged guest escape via fwctl
Source: CVE Program / CVE List V5
Vulnerability Description
The fwctl driver implements a state machine which is executed when a bhyve guest accesses certain x86 I/O ports. The interface lets the guest copy a string into a buffer resident in the bhyve process' memory. A bug in the state machine implementation can result in a buffer overflowing when copying this string. Malicious, privileged software running in a guest VM can exploit the buffer overflow to achieve code execution on the host in the bhyve userspace process, which typically runs as root, mitigated by the capabilities assigned through the Capsicum sandbox available to the bhyve process.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
未进行输入大小检查的缓冲区拷贝(传统缓冲区溢出)
Source: CVE Program / CVE List V5
Vulnerability Title
FreeBSD 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FreeBSD是FreeBSD基金会的一套类Unix操作系统。 FreeBSD 13.1版本和13.2版本存在安全漏洞，该漏洞源于fwctl driver状态机存在缓冲区溢出漏洞。攻击者可利用该漏洞在主机的bhyve用户空间进程中以root身份执行任意代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
FreeBSD FreeBSD 13.2-RELEASE ~ 13.2-RELEASE-p2 -

II. Public POCs for CVE-2023-3494

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III. Intelligence Information for CVE-2023-3494

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Vendor Advisories for CVE-2023-3494 (1)

Other References for CVE-2023-3494 (1)

IV. Related Vulnerabilities

Same product: FreeBSD
Same vendor: FreeBSD
Same weakness: CWE-120

V. Comments for CVE-2023-3494

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