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CVE-2021-32846

7.7 · HIGH

HyperKit is a toolkit for embedding hypervisor capabilities in an application.

Published Feb 17, 2023CWE-908EPSS 0.32%

Overview

CVE-2021-32846 is a high-severity vulnerability. It was published on February 17, 2023 and has a CVSS 3.1 base score of 7.7 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.7, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical description

HyperKit is a toolkit for embedding hypervisor capabilities in an application. In versions 0.20210107, function `pci_vtsock_proc_tx` in `virtio-sock` can lead to to uninitialized memory use. In this situation, there is a check for the return value to be less or equal to `VTSOCK_MAXSEGS`, but that check is not sufficient because the function can return `-1` if it finds an error it cannot recover from. Moreover, the negative return value will be used by `iovec_pull` in a while condition that can further lead to more corruption because the function is not designed to handle a negative `iov_len`. 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 af5eba2360a7351c08dfd9767d9be863a50ebaba.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/moby/hyperkit/commit/af5eba2360a7351c08dfd9767d9be863a50ebabaGitHubgithub.com/moby/hyperkit/pull/313GitHubsecuritylab.github.com/advisories/GHSL-2021-054_057-moby-hyperkit/GitHubgithub.com/moby/hyperkit/commit/af5eba2360a7351c08dfd9767d9be863a50ebabaGitHubgithub.com/moby/hyperkit/pull/313GitHubsecuritylab.github.com/advisories/GHSL-2021-054_057-moby-hyperkit/

How CyberStrike helps

Frequently asked questions

What is CVE-2021-32846?

CVE-2021-32846 is a high-severity vulnerability. It was published on February 17, 2023 and has a CVSS 3.1 base score of 7.7 (HIGH).

How severe is CVE-2021-32846?

This vulnerability has a CVSS 3.1 base score of 7.7, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-32846?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-32846?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-32846 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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