Vulnerability CVE-2009-4419
Published: 2009-12-24   Modified: 2012-02-13

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.

See advisories in our WLB2 database:
Topic
Author
Date
High
Intel *45 *35 chipset - txt attack
Joanna Rutkowska
26.12.2009

Type:

CWE-16

 (Configuration)

CVSS2 => (AV:L/AC:L/Au:N/C:C/I:C/A:C)

CVSS Base Score
Impact Subscore
Exploitability Subscore
7.2/10
10/10
3.9/10
Exploit range
Attack complexity
Authentication
Local
Low
No required
Confidentiality impact
Integrity impact
Availability impact
Complete
Complete
Complete
Affected software
Intel -> Gm45 chipset 
Intel -> Pm45 express chipset 
Intel -> Q35 chipset 
Intel -> Q43 express chipset 
Intel -> Q45 chipset 

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