Gerd Hoffmann <kra...@redhat.com> writes:
> Slash is unix directory separator, so they are not allowed in filenames.
> Note this also stops the classic escape via "../".
>
> Fixes: CVE-2018-16867
> Reported-by: Michael Hanselmann (hansmi.ch)
> Signed-off-by: Gerd Hoffmann <kra...@redhat.com>
> ---
> hw/usb/dev-mtp.c | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> diff --git a/hw/usb/dev-mtp.c b/hw/usb/dev-mtp.c
> index fbe1ace035..87eeac1084 100644
> --- a/hw/usb/dev-mtp.c
> +++ b/hw/usb/dev-mtp.c
> @@ -1718,6 +1718,12 @@ static void usb_mtp_write_metadata(MTPState *s)
>
> filename = utf16_to_str(dataset->length, dataset->filename);
>
> + if (strchr(filename, '/')) {
> + usb_mtp_queue_result(s, RES_INVALID_PARAMETER, d->trans,
> + 0, 0, 0, 0);
> + return;
> + }
> +
> o = usb_mtp_object_lookup_name(p, filename, dataset->length);
> if (o != NULL) {
> next_handle = o->handle;
Should we return PARAMETER_NOT_SUPPORTED instead of INVALID_PARAMETER ?
That's a valid response code for SendObjectInfo acc to the spec.
Bandan
