Date: Tue, 4 Dec 2018 12:48:20 +0100 From: Marcus Meissner <meissner@...e.de> To: oss-security@...ts.openwall.com Subject: Re: UAF write in usb_audio_probe Hi Mitre assigned CVE-2018-19824. On Mon, Dec 03, 2018 at 05:45:30PM +0100, Mathias Payer wrote: > Hi there, > > We reported a security bug to security@...nel.org we discovered in the Linux > kernel when fuzzing the hardware/software interface, targeting malicious USB > peripherals. We have developed a fuzzing infrastructure that emulates malicious > USB peripherals, allowing a fuzzer to feed test input into a virtualized kernel. > We have tested 8 different recent kernel versions and have found new 37 bugs (so > far). A first glimpse at all discovered vulnerabilities shows that they contain > a set of arbitrary reads and arbitrary writes. > > The attacker needs local access to plug in a malicious USB device that replays > the trace (e.g., through FaceDancer) to get read/write primitives in the kernel. > For, e.g., Android or locked Desktops this becomes security critical. This turns > these bugs into local "pop the box" opportunities, e.g., to disable screen locks > or gain root. > > We can provide input USB seeds/traces for all discovered bugs/vulnerabilities > and will report the other bugs as we triage them. Note that we submitted the > paper that presents the technique to the Dec 01 IEEE Security and Privacy deadline. > > So far, we have submitted one bug (and patch) to alsa-devel@...a-project.org > (after discussing both with the security@...nel.org list). This bug is likely > exploitable, allowing a local user (not logged in) to gain a write primitive in > the kernel by simply plugging in a malicious USB device. > The patch is at: > https://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound.git/commit/?id=5f8cf712582617d523120df67d392059eaf2fc4b > > Thanks, > Mathias Payer > -- Marcus Meissner,SUSE LINUX GmbH; Maxfeldstrasse 5; D-90409 Nuernberg; Zi. 3.1-33,+49-911-740 53-432,,serv=loki,mail=wotan,type=real <meissner@...e.de>
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