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Re: Ask for suggestions for CVE-2019-12928

From: Dr. David Alan Gilbert
Subject: Re: Ask for suggestions for CVE-2019-12928
Date: Tue, 19 Jan 2021 20:17:47 +0000
User-agent: Mutt/1.14.6 (2020-07-11)

* 江芳杰 (18401698361@126.com) wrote:
> Hi:
>     Sorry to bother you~
>     I have read the discussions about CVE--2019-12928 ( 
> https://lists.gnu.org/archive/html/qemu-devel/2019-07/msg01153.html).
> But, for the scenario of PC users, which is no requirement of network access 
> to QMP, there are some mitigating proposes.
> 1. Modify the compilation options to disable QMP.
> 2. Modify command line parsing function to discard the QMP parameters with 
> network configurations.
> 3. PC manager or other manage software make sure only the trusted user can 
> use QMP.
> 4. Other ideas?

QMP is a useful part of QEMU - so we don't want to do 1 - we need it to
let things control QEMU; including configuring complex setups.

The important part is (3) - anything that runs a qemu must make sure it
wires the QMP up securely; e.g. using unix sockets with appropriate
permissions or something like that.

As long as they do that, then we're fine.


Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK

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