24746 : FreeBSD FPU x87 Register Information Disclosure
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Info

Last Modified
about 1 year ago

Percent Complete
100%

Disclosure
Apr 19, 2006

Discovery
Unknown

Dates

Exploit
Unknown

Solution
Unknown

Keywords

 VMSA-2006-0005

Description

 FreeBSD contains a flaw that may lead to an unauthorized information disclosure. The issue is triggered because the Floating Point Units (FPUs) of the affected processor types do not save and restore the FOP, FID and FPD registers when certain instructions are executed. As a result, FreeBSD does not clear these registers either. When a context switch occurs, a user can potentially read these uncleared registers which could disclose floating point information, resulting in a loss of confidentiality.

Classification

 Location: Local Access Required
Attack Type: Information Disclosure
Impact: Loss of Confidentiality
Exploit: Exploit Unknown
Disclosure: OSVDB Verified

Technical

 The issue is only present on 7th (K7) and 8th (K8) generation AMD64 processors. All other platforms are not affected.

Solution

 Upgrade to the security branch of your FreeBSD version dated after the correction date, as it has been reported to fix this vulnerability. An upgrade is required as there are no known workarounds.

Products
FreeBSD Project
Watch-list
FreeBSD
Watch-list
 4.10
5.3
5.4
4.11
6.0
5.5
6.1

References

Tools & Filters

Nessus

 21252 21253 22054 22086 22639 27877

Credit
  • Jan Beulich -

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