oss-security - Re: CVE request - kvm: cat /dev/port in the guest can cause host DoS

Follow @Openwall on Twitter for new release announcements and other news

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <741878604.897651265144211229.JavaMail.root@zmail01.collab.prod.int.phx2.redhat.com>
Date: Tue, 2 Feb 2010 15:56:51 -0500 (EST)
From: Josh Bressers <bressers@...hat.com>
To: oss-security@...ts.openwall.com
Cc: "Steven M. Christey" <coley@...us.mitre.org>
Subject: Re: CVE request - kvm: cat /dev/port in the guest
 can cause host DoS

----- "Eugene Teo" <eugeneteo@...nel.sg> wrote:

> The problem is pit_state->channels[] has 3 elements, and
> pit_ioport_read 
> uses "addr" as index to pit_get_count, so inb(0x43) reads (and 
> potentially writes) into other data of kvm_kpit_state.
> 
> PIT control word (address 0x43) is write-only, reads are undefined.
> 
> Triggering this can cause a general protection fault on the host.
> 
> https://bugzilla.redhat.com/show_bug.cgi?id=560887
> http://www.mail-archive.com/kvm@vger.kernel.org/msg28002.html
> 

Please use CVE-2010-0309 for this.

Thanks.

-- 
    JB

Please check out the Open Source Software Security Wiki, which is counterpart to this mailing list.

Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.