Vulnerability in Moby Hyperkit
CVE-2021-32845
HyperKit is a toolkit for embedding hypervisor capabilities in an application. In versions 0.20210107 and prior of HyperKit, the implementation of `qnotify` at `pci_vtrnd_notify` fails to check the return value of `vq_getchain`. This leads to `struct iovec iov;` being uninitialized and used to read memory in `len = (int) read(sc->vrsc_fd, iov.iov_base, iov.iov_len);` when an attacker is able to make `vq_getchain` fail. This issue may lead to a guest crashing the host causing a denial of service and, under certain circumstance, memory corruption. This issue is fixed in commit 41272a980197917df8e58ff90642d14dec8fe948.
EPSS: 0.003 (16.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.7 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H.
Affected products
- Moby Hyperkit — versions 0.20210107
- Mobyproject Hyperkit
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security-advisories@github.com (Third Party Advisory)
- security-advisories@github.com (Patch)
- security-advisories@github.com (Patch)
Frequently asked questions
- What is CVE-2021-32845?
- CVE-2021-32845 is a high-severity vulnerability in Moby Hyperkit, classified under Use of Uninitialized Resource. CVSS score: 7.7/10. Published 2023-02-17.
- How severe is CVE-2021-32845?
- High severity. CVSS v3 base score is 7.7 out of 10.
- Is CVE-2021-32845 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.