oss-security - CVE-2020-10717 QEMU: virtiofsd: guest may open maximum file descriptor to cause DoS

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Message-ID: <nycvar.YSQ.7.76.2005041135590.1083026@xnncv>
Date: Mon, 4 May 2020 11:40:42 +0530 (IST)
From: P J P <ppandit@...hat.com>
To: oss security list <oss-security@...ts.openwall.com>
cc: yavrahami@...oaltonetworks.com
Subject: CVE-2020-10717 QEMU: virtiofsd: guest may open maximum file descriptor
 to cause DoS

   Hello,

A potential DoS issue was found in the virtio-fs shared file system daemon 
(virtiofsd) implementation of the QEMU. Virtiofsd is meant to share a host 
file system directory with a guest via virtio-fs device. The said DoS may 
occur on the host, if the guest was to open the maximum number of file 
descriptors under the shared directory. A guest user/process may use this flaw 
to cause DoS issue on the host.

Upstream patch(es):
-------------------
   -> https://lists.gnu.org/archive/html/qemu-devel/2020-05/msg00143.html
   -> https://lists.gnu.org/archive/html/qemu-devel/2020-05/msg00141.html

This issue was reported by Yuval Avrahami of Palo Alto Networks.

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

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