oss-security - Re: CVE-2019-14835: QEMU-KVM Guest to Host Kernel Escape Vulnerability: vhost/vhost

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Date: Wed, 9 Oct 2019 10:56:15 +0800
From: bo Zhang <zhangbo5891001@...il.com>
To: oss-security@...ts.openwall.com, Tina Li <tli@...italocean.com>, 
	tiangangpi@...il.com
Cc: Vineeth Remanan Pillai <vpillai@...italocean.com>
Subject: Re: CVE-2019-14835: QEMU-KVM Guest to Host Kernel Escape
 Vulnerability: vhost/vhost_net kernel buffer overflow

Hi, Tina
This vulnerability is a kernel vul and different verison of Qemu should not
affect the reproduce. Try the following steps:

1. The guest kernel patch is for this version:
Ubuntu-hwe-4.15.0-50.54_16.04.1(
https://kernel.ubuntu.com/git/ubuntu/ubuntu-xenial.git/tree/drivers/virtio/virtio_ring.c?h=Ubuntu-hwe-4.15.0-50.54_16.04.1),
if you use different kernel version, the patch may need to be modified
slightly.
The patch makes the guest kernel create a invalid descriptor table and the
echo command is just to trigger the bug through a kernel variable.

2. Ubuntu had released the patched kernel, the host kernel you used should
not be patched(< 5.2.x) for reproducing the vulnerability.

Thanks!
cradmin of Tencent Blade Team

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