Date: Thu, 18 Aug 2016 16:39:57 +0200 From: Marcus Meissner <meissner@...e.de> To: Greg KH <greg@...ah.com> Cc: OSS Security List <oss-security@...ts.openwall.com>, cve-assign@...re.org, security@...nel.org Subject: Re: CVE Request: Linux kernel crash of OHCI when plugging in malicious USB devices On Thu, Aug 18, 2016 at 04:30:14PM +0200, Greg KH wrote: > On Thu, Aug 18, 2016 at 04:22:16PM +0200, Marcus Meissner wrote: > > Hi, > > > > I think this does not have a CVE yet, please assign. > > > > https://www.spinics.net/lists/linux-usb/msg144177.html > > > > Headline: Linux Kernel Panic Over USB with HID Keyboard wMaxPacketSize > > Platforms: Ubuntu > > Versions: Linux Kernel 4.4.0-22-generic > > Huh? It's much more pervasive than just that single platform or single > version. That was the quote from the original e-mail. I read further on it affects more kernel versions. > > CVSS Score: 4.7 > > CVSS Vector: AV:L/AC:M/Au:N/C:N/I:N/A:C > > Filed Defects: > > Related Defects: > > CWE Tags: > > Cycle: > > Found by: Jake Lamberson > > > > > > Linux Kernel panics when using an OHCI controller if a USB device reports being > > a generic HID keyboard and reports a wMaxPacketSize of over 4095. The OHCI > > controller driver fails to reserve bandwidth for the device, causing the > > keyboard handler to fail when attaching to the HID. Later, when the device is > > removed, the system crashes due to a null pointer dereference in a linked list > > of endpoint descriptors. The crash can be re-created using a Facedancer and UMAP > > software. Given an appropriately configured Facedancer and UMAP setup, the crash > > can be re-created with: > > sudo board=facedancer21 python3 umap.py -P /dev/serial_device_here -f 03:00:00:E:0046 -l LOG > > > > Note: OHCI is a USB 1.1 controller standard that can be included with devices > > that support either USB 1.1 or 2.0 as their highest USB spec. USB 3.0 devices > > all use xHCI, which implements USB 1.1, 2.0, and 3.0, making them immune to > > this particular bug. > > > > ----------------- > > > > The proposed fixing patch is here: > > https://www.spinics.net/lists/linux-usb/msg144269.html > > > > > > It has not yet been committed to the USB tree or to Linus Tree as far as I see. > > Not true, it is commit id aed9d65ac3278d4febd8665bd7db59ef53e825fe in > the usb tree and in linux-next and will be sent to Linus tomorrow. Ah sorry, only looked briefly. > And are we really assigning CVE numbers for when you use an active > "hardware test probe"? If so, how many are people going to be assigning > for these same problems on other operating systems? :) I think attaching malicious USB devices and crashing the kernel should probably get CVE ids, or do you think it should not? Ciao, Marcus
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