Vulnerability Note VU#277400
Windows 7 and Windows Server 2008 R2 x64 fail to protect kernel memory when the Microsoft update for meltdown is installed
Original Release date: 29 Mar 2018 | Last revised: 02 Apr 2018

Overview
When the Microsoft update for meltdown is installed on a Windows 7 x64 or Windows Server 2008 R2 x64 system, an unprivileged process may be able to read and write the entire memory space available to the Windows kernel.

Description
The update that Microsoft has released for meltdown on x64 versions of Windows 7 and Windows Server 2008 R2 incorrectly sets the permission bit for memory accessible from unprivileged user space.

As a result, such platforms that have the meltdown update installed, which was released in January 2018 will not properly protect the contents of system memory.

Impact
An attacker with the ability to run code on an affected platform as an unprivileged user may be able to read from and write to the entire contents of system memory.

Solution
Apply an update
This issue is addressed in the Microsoft update for CVE-2018-1038.

Vendor Information (Learn More)

VendorStatusDate NotifiedDate UpdatedMicrosoftAffected-29 Mar 2018If you are a vendor and your product is affected, let
us know.

CVSS Metrics (Learn More)

Group
Score
Vector

Base
6.8
AV:L/AC:L/Au:S/C:C/I:C/A:C

Temporal
5.6
E:F/RL:OF/RC:C

Environmental
5.6
CDP:ND/TD:H/CR:ND/IR:ND/AR:ND

References

https://www.kb.cert.org/vuls/id/584653

http://blog.frizk.net/2018/03/total-meltdown.html
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-1038

Credit

This vulnerability was publicly reported by Ulf Frisk.
This document was written by Will Dormann.

Other Information

CVE IDs:
CVE-2018-1038

Date Public:
27 Mar 2018

Date First Published:
29 Mar 2018

Date Last Updated:
02 Apr 2018

Document Revision:
18

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