qmp_guest_file_read in qga/commands-posix.c and qga/commands-win32.c in qemu-ga (aka QEMU Guest Agent) in QEMU 2.12.50 has an integer overflow causing a g_malloc0() call to trigger a segmentation fault when trying to allocate a large memory chunk. The vulnerability can be exploited by sending a crafted QMP command (including guest-file-read with a large count value) to the agent via the listening socket.
http://www.securityfocus.com/bid/104531
https://gist.github.com/fakhrizulkifli/c7740d28efa07dafee66d4da5d857ef6
https://lists.debian.org/debian-lts-announce/2019/02/msg00041.html
https://lists.gnu.org/archive/html/qemu-devel/2018-06/msg03385.html
https://seclists.org/bugtraq/2019/May/76
https://usn.ubuntu.com/3826-1/
Source: MITRE
Published: 2018-06-21
Updated: 2020-11-19
Type: CWE-190
Base Score: 5
Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P
Impact Score: 2.9
Exploitability Score: 10
Severity: MEDIUM
Base Score: 7.5
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Impact Score: 3.6
Exploitability Score: 3.9
Severity: HIGH