oss-security - CVE-2020-25084 QEMU: usb: use-after-free issue while setting up packet

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Date: Wed, 16 Sep 2020 23:57:52 +0530 (IST)
From: P J P <ppandit@...hat.com>
To: oss security list <oss-security@...ts.openwall.com>
cc: bugs-syssec@....de
Subject: CVE-2020-25084 QEMU: usb: use-after-free issue while setting up
 packet

   Hello,

An use-after-free issue was found in USB(xHCI/eHCI) controller emulators of 
QEMU. It occurs while setting up USB packet, as usb_packet_map() routine may 
return an error, which was not checked. A guest user/process may use this flaw 
to crash the QEMU process resulting in DoS scenario.

Upstream patches:
-----------------
   -> https://lists.nongnu.org/archive/html/qemu-devel/2020-08/msg08050.html
   -> https://lists.nongnu.org/archive/html/qemu-devel/2020-08/msg08043.html

References:
-----------
   -> https://ruhr-uni-bochum.sciebo.de/s/NNWP2GfwzYKeKwE?path=%2Fxhci_uaf_2

* This issue was reported by Sergej Schumilo, Cornelius Aschermann, Simon
   Wrner of Ruhr-University Bochum.

* 'CVE-2020-25084' assigned via https://cveform.mitre.org

Thank you.
--
Prasad J Pandit / Red Hat Product Security Team
8685 545E B54C 486B C6EB 271E E285 8B5A F050 DE8D

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