oss-security - CVE-2016-3712 Qemu: vga: out-of-bounds read and integer overflow issues

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Date: Mon, 9 May 2016 17:40:04 +0530 (IST)
From: P J P <ppandit@...hat.com>
To: oss security list <oss-security@...ts.openwall.com>
cc: Michael Roth <mdroth@...ux.vnet.ibm.com>,
        Peter Maydell <peter.maydell@...aro.org>,
        Gerd Hoffmann <ghoffman@...hat.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        zuozhi.fzz@...baba-inc.com
Subject: CVE-2016-3712 Qemu: vga: out-of-bounds read and integer overflow
 issues

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

   Hello,

An out-of-bounds read and integer overflow issue was reported in the Qemu 
emulator's VGA module.

Qemu VGA module allows guest to edit certain registers in 'vbe' and 'vga' 
modes. ie. guest could set certain 'VGA' registers while in 'VBE' mode. This 
leads to potential integer overflow or OOB read access issues in Qemu, 
resulting in DoS by crashing the Qemu process on the host. (Moderate)

A privileged guest user could use this flaw to crash the Qemu process on the 
host.

'CVE-2016-3712' has been assigned to this issue by Red Hat Inc. Patches are 
attached herein to help fix this issue.

This issue was discovered and reported by Zuozhi Fzz of Alibaba Inc.

Thank you.
- --
Prasad J Pandit / Red Hat Product Security Team
47AF CE69 3A90 54AA 9045 1053 DD13 3D32 FE5B 041F

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View attachment "0005-vga-make-sure-vga-register-setup-for-vbe-stays-intac.patch" of type "text/plain" (2873 bytes)

View attachment "0004-vga-update-vga-register-setup-on-vbe-changes.patch" of type "text/plain" (948 bytes)

View attachment "0003-vga-factor-out-vga-register-setup.patch" of type "text/plain" (5241 bytes)

View attachment "0002-vga-add-vbe_enabled-helper.patch" of type "text/plain" (2163 bytes)

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