Quick Emulator (Qemu) built with the VirtFS, host directory sharing via Plan 9 File System (9pfs) support, is vulnerable to an improper access control issue. It could occur while accessing files on a shared host directory. A privileged user inside guest could use this flaw to access host file system beyond the shared folder and potentially escalating their privileges on a host.
http://www.openwall.com/lists/oss-security/2017/04/19/2
http://www.securityfocus.com/bid/97970
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-7471
https://git.qemu.org/?p=qemu.git;a=commitdiff;h=9c6b899f7a46893ab3b671e341a2234e9c0c060e
Source: MITRE
Published: 2018-07-09
Updated: 2020-09-10
Type: CWE-732
Base Score: 7.7
Vector: AV:A/AC:L/Au:S/C:C/I:C/A:C
Impact Score: 10
Exploitability Score: 5.1
Severity: HIGH
Base Score: 9
Vector: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Impact Score: 6
Exploitability Score: 2.3
Severity: CRITICAL