CVE-2023-3494 (GCVE-0-2023-3494)

Vulnerability from cvelistv5 – Published: 2023-08-01 22:13 – Updated: 2025-02-13 16:55
VLAI?
Title
bhyve privileged guest escape via fwctl
Summary
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.
Severity ?
No CVSS data available.
CWE
  • CWE-120 - Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
Assigner
References
Impacted products
Vendor Product Version
FreeBSD FreeBSD Affected: 13.2-RELEASE , < 13.2-RELEASE-p2 (release)
Affected: 13.1-RELEASE , < 13.1-RELEASE-p9 (release)
Create a notification for this product.
Credits
Omri Ben Bassat and Vladimir Eli Tokarev from Microsoft
Show details on NVD website
To clipboard 

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Sightings

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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