bhyve Virtio_SCSI Heap Leak Enables Host RCE (CVE-2024-43110)
CVE-2024-43110 Published on September 5, 2024
Multiple issues in ctl(4) CAM Target Layer
The ctl_request_sense function could expose up to three bytes of the kernel heap to userspace.
Malicious software running in a guest VM that exposes virtio_scsi can exploit the vulnerabilities to achieve code execution on the host in the bhyve userspace process, which typically runs as root. Note that bhyve runs in a Capsicum sandbox, so malicious code is constrained by the capabilities available to the bhyve process. A malicious iSCSI initiator could achieve remote code execution on the iSCSI target host.
Vulnerability Analysis
CVE-2024-43110 is exploitable with local system 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 very high.
Weakness Type
Out-of-bounds Read
The software reads data past the end, or before the beginning, of the intended buffer. Typically, this can allow attackers to read sensitive information from other memory locations or cause a crash. A crash can occur when the code reads a variable amount of data and assumes that a sentinel exists to stop the read operation, such as a NUL in a string. The expected sentinel might not be located in the out-of-bounds memory, causing excessive data to be read, leading to a segmentation fault or a buffer overflow. The software may modify an index or perform pointer arithmetic that references a memory location that is outside of the boundaries of the buffer. A subsequent read operation then produces undefined or unexpected results.
Products Associated with CVE-2024-43110
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Affected Versions
FreeBSD:- Version 14.1-RELEASE and below p4 is affected.
- Version 14.0-RELEASE and below p10 is affected.
- Version 13.3-RELEASE and below p6 is affected.
- Version 14.1 and below 14.1_p4 is affected.
- Version 14.0 and below 14.0_p10 is affected.
- Version 13.3 and below 13.3_p6 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.