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TITLE:
Microsoft BitLocker Password Disclosure Security Issue

SECUNIA ADVISORY ID:
SA31619

VERIFY ADVISORY:
http://secunia.com/advisories/31619/

CRITICAL:
Less critical

IMPACT:
Exposure of sensitive information

WHERE:
Local system

OPERATING SYSTEM:
Microsoft Windows Vista
http://secunia.com/product/13223/

DESCRIPTION:
A security issue has been reported in Microsoft BitLocker, which can
be exploited by malicious, local users to disclose sensitive
information.

The security issue is caused due to the BIOS keyboard buffer not
being properly flushed when pre-boot authentication is used and can
be exploited to disclose the used password.

Successful exploitation requires that BitLocker is configured to use
a TPM chip.

The security issue is reported in Microsoft BitLocker included
Windows Vista without Service Pack 1.

SOLUTION:
The security issue is reportedly fixed in Windows Vista Service Pack
1.

PROVIDED AND/OR DISCOVERED BY:
Jonathan Brossard, iViZ Techno Solutions

ORIGINAL ADVISORY:
http://www.ivizsecurity.com/security-advisory-iviz-sr-0801.html

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About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

Subscribe:
http://secunia.com/secunia_security_advisories/

Definitions: (Criticality, Where etc.)
http://secunia.com/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

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