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Re: [Qemu-devel] [PATCH for-3.1 v2 2/2] usb-mtp: outlaw slashes in filen
From: |
Philippe Mathieu-Daudé |
Subject: |
Re: [Qemu-devel] [PATCH for-3.1 v2 2/2] usb-mtp: outlaw slashes in filenames |
Date: |
Mon, 3 Dec 2018 10:45:18 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.3.1 |
On 3/12/18 9:59, Gerd Hoffmann wrote:
> 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 <address@hidden>
> Signed-off-by: Gerd Hoffmann <address@hidden>
Reviewed-by: Philippe Mathieu-Daudé <address@hidden>
> ---
> 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 0f6a9702ef..e340a2c6e3 100644
> --- a/hw/usb/dev-mtp.c
> +++ b/hw/usb/dev-mtp.c
> @@ -1719,6 +1719,12 @@ static void usb_mtp_write_metadata(MTPState *s)
>
> filename = utf16_to_str(dataset->length, dataset->filename);
>
> + if (strchr(filename, '/')) {
> + usb_mtp_queue_result(s, PARAMETER_NOT_SUPPORTED, d->trans,
> + 0, 0, 0, 0);
> + return;
> + }
> +
> o = usb_mtp_object_lookup_name(p, filename, dataset->length);
> if (o != NULL) {
> next_handle = o->handle;
>