oss-security - Re: CVE Request/Guidance: Linux kernel cdc-wdm buffer overflow triggered by device

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

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

Message-ID: <CAGyNYUNFXcwM5UC_RyK9dkBTXQr6Nu3qj0QkbQ7fP6EJxX+M4Q@mail.gmail.com>
Date: Thu, 14 Mar 2013 21:51:29 +0800
From: Eugene Teo <eugeneteo@...nel.sg>
To: "oss-security@...ts.openwall.com" <oss-security@...ts.openwall.com>
Subject: Re: CVE Request/Guidance: Linux kernel cdc-wdm buffer
 overflow triggered by device

Hi Marcus,

On Thursday, 14 March 2013, Marcus Meissner wrote:

> Hi,
>
> I am wondering ... do we consider attacks with special attack taylored USB
> devices as CVE worthy?
>
> There is only some precedence in the CVE DB, but not much.
>
> I stumbled over this fix from one of my colleagues where a specifically
> made USB device reporting the "cdc-wdm" USB class could cause a kernel
> heap overflow.
>
> "Malicious attached devices" might fall into several categories:
>
> 1. Attaching the device causes the issue directly within the kernel /
> autoloaded
>    module, without user interaction. (here the case)
>
>
> 2. Attaching the device causes the issue when userspace, dependend on
>    e.g. desktop system, does initiate a seperate action (like an automount
>    and then exploitation of something) (so not direct a kernel, but a
>    kernel + GNOME/KDE interaction).
>
>
> 3. User needs to do something with the attached device (like click on
>    a file on a USB disk)
>
>
> I would consider (1) and (2) CVE worthy at least, not so sure with (3).


I agree with (1) and (2). I have seen (3) with CVE names too. If a local,
unprivileged user can cause an issue by accessing a file or listing a set
of files in a directory due to a flaw in the underlying file system, I
think it should have a CVE name assigned.

Thanks, Eugene


>
> Ciao, Marcus
>
> commit c0f5ecee4e741667b2493c742b60b6218d40b3aa
> Author: Oliver Neukum <oneukum@...e.de <javascript:;>>
> Date:   Tue Mar 12 14:52:42 2013 +0100
>
>     USB: cdc-wdm: fix buffer overflow
>
>     The buffer for responses must not overflow.
>     If this would happen, set a flag, drop the data and return
>     an error after user space has read all remaining data.
>
>     Signed-off-by: Oliver Neukum <oliver@...kum.org <javascript:;>>
>     CC: stable@...nel.org <javascript:;>
>     Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org<javascript:;>
> >
>
>
>
>

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.