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Message-ID: <so4o1n2-r92q-8sn6-829r-qns5o0qo873@erqung.pbz>
Date: Fri, 22 Jan 2021 13:42:27 +0530 (IST)
From: P J P <ppandit@...hat.com>
To: oss security list <oss-security@...ts.openwall.com>
cc: Alex Xu <alex@...u.ca>, Stefan Hajnoczi <shajnocz@...hat.com>
Subject: CVE-2020-35517 QEMU: virtiofsd: potential privileged host device
access from guest
Hello,
A potential host privilege escalation issue was found in the virtio-fs shared
file system daemon (virtiofsd) of the QEMU. Virtio-fs daemon shares host
directory tree with a guest VM. The said privilege escalation scenario may
occur if a privileged guest user was to create device special file in the
shared directory and use it to r/w access host devices. A privileged guest
user may use this flaw to arbitrarily access (r/w) host files resulting in DoS
scenario or may potentially escalate privileges on the host.
Upstream patch:
---------------
-> https://lists.gnu.org/archive/html/qemu-devel/2021-01/msg05461.html
* This issue was reported by Alex Xu (CC'd).
* 'CVE-2020-35517' assigned by Red Hat Inc.
Thank you.
--
Prasad J Pandit / Red Hat Product Security Team
8685 545E B54C 486B C6EB 271E E285 8B5A F050 DE8D
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