oss-security - CVE request Qemu: usb: infinite loop in ehci_advance

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Message-ID: <alpine.LFD.2.20.1512142033580.2864@wniryva>
Date: Mon, 14 Dec 2015 20:40:29 +0530 (IST)
From: P J P <ppandit@...hat.com>
To: oss security list <oss-security@...ts.openwall.com>
cc: Qinghao Tang <luodalongde@...il.com>, Gerd Hoffmann <kraxel@...hat.com>
Subject: CVE request Qemu: usb: infinite loop in ehci_advance_state results
 in DoS

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

   Hello,

Qemu emulator built with the USB EHCI emulation support is vulnerable to an 
infinite loop issue. It occurs during communication between host controller 
interface(EHCI) and a respective device driver. These two communicate via a 
isochronous transfer descriptor list(iTD) and an infinite loop unfolds if 
there is a closed loop in this list.

A privileges user inside guest could use this flaw to consume excessive CPU 
cycles & resources on the host.

Upstream fix:
- -------------
   -> https://lists.gnu.org/archive/html/qemu-devel/2015-12/msg02124.html

This issue was discovered by Qinghao Tang of QIHU 360 Marvel Team.

Thank you.
- --
Prasad J Pandit / Red Hat Product Security Team
47AF CE69 3A90 54AA 9045 1053 DD13 3D32 FE5B 041F

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