Vulnerability Details : CVE-2021-32843
HyperKit is a toolkit for embedding hypervisor capabilities in an application. In versions 0.20210107 and prior of HyperKit, `virtio.c` has is a call to `vc_cfgread` that does not check for null which when called makes the host crash. This issue may lead to a guest crashing the host causing a denial of service. This issue is fixed in commit df0e46c7dbfd81a957d85e449ba41b52f6f7beb4.
Vulnerability category: Denial of service
Products affected by CVE-2021-32843
- cpe:2.3:a:mobyproject:hyperkit:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-32843
0.04%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 13 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-32843
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
5.5
|
MEDIUM | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
1.8
|
3.6
|
NIST | |
|
6.2
|
MEDIUM | CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
2.5
|
3.6
|
GitHub, Inc. |
CWE ids for CVE-2021-32843
-
The product dereferences a pointer that it expects to be valid but is NULL.Assigned by:
- nvd@nist.gov (Primary)
- security-advisories@github.com (Secondary)
References for CVE-2021-32843
-
https://github.com/moby/hyperkit/pull/313
Various fixes by fredericdalleau · Pull Request #313 · moby/hyperkit · GitHubPatch
-
https://github.com/moby/hyperkit/commit/df0e46c7dbfd81a957d85e449ba41b52f6f7beb4
Fix vi_pci_read null vc_cfgread function pointer dereference (GHSL-20… · moby/hyperkit@df0e46c · GitHubPatch
-
https://securitylab.github.com/advisories/GHSL-2021-054_057-moby-hyperkit/
GHSL-2021-054_057: Code execution outside the virtualized guest in hyperkit - CVE-2021-32843, CVE-2021-32844, CVE-2021-32845, CVE-2021-32846 | GitHub Security LabThird Party Advisory
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