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VMware Security Advisory
Advisory ID: VMSA-2006-0009 Synopsis: VMware ESX Server 3.0.0 AMD fxsave/restore issue Knowledge base URL:http://kb.vmware.com/kb/2533126 Issue date: 2006-10-31 Updated on: 2006-11-13 CVE-2006-1056
Updated package addresses an AMD fxsave/restore security vulnerability.
This patch is for ESX Server 3.0.0 only (with or without other patches for ESX 3.0.0)
An AMD fxsave/restore security vulnerability. The instructions fxsave and fxrstor on AMD CPUs are used to save or restore the FPU registers (FOP, FIP and FDP). On AMD Opteron processors, these instructions do not save/restore some exception related registers unless an exception is currently being serviced. This could allow a local attacker to partially monitor the execution path of FPU processes, possibly allowing them to obtain sensitive information being passed through those processes.
The Common Vulnerabilities and Exposures project (cve.mitre.org) assigned the name CVE-2006-1056 to this issue.
Log into the ESX Server service console as root.
Create a local depot directory.
# mkdir /var/updates Note: VMware recommends that you use the updates directory.
Change your working directory to /var/updates.
# cd /var/updates
Download patch ESX-2533126 from http://www.vmware.com/download/vi/ into the /var/updates directory.
Verify the integrity of the downloaded tar file:
# md5sum ESX-2533126.tgz
The md5 checksum output should match the following:
Extract the compressed tar archive:
# tar -xvzf ESX-2533126.tgz
Change to the newly created directory, /var/updates/ESX-2533126:
# cd ESX-2533126
Once you have downloaded and extracted the archive, and if you are in the directory you created above, install the update using the following command:
For more information on using esxupdate, please refer to the Patch Management for ESX Server 3 tech note at http://www.vmware.com/pdf/esx3_esxupdate.pdf.
Note: This security patch is part of the October 2006 patch release for VI3. A second (non-security) patch is also available. Installation of these two patches is independent and you do not need to install both to be in a supported state. The other patch is available at http://kb.vmware.com/kb/2666943
http://kb.vmware.com/kb/2533126 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-1056 http://www.vmware.com/products/esx/ http://www.vmware.com/download/esx/
VMware Security Response Policy http://www.vmware.com/vmtn/technology/security/security_response.html
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