Integer overflow in QEMU - CVE-2018-12617
Published: July 30, 2018 / Updated: June 17, 2021
Vulnerability identifier: #VU14116
CSH Severity: Low
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2018-12617
CWE-ID: CWE-190
Exploitation vector: Remote access
Exploit availability:
Public exploit is available
Vulnerability details
The vulnerability allows a remote attacker to cause DoS condition on the target system.
The vulnerability exists due to integer overflow in qmp_guest_file_read in qga/commands-posix.c and qga/commands-win32.c in qemu-ga (aka QEMU Guest Agent). A remote attacker can send a specially crafted QMP command (including guest-file-read with a large count value) to the agent via the listening socket, cause a g_malloc0() call to trigger a segmentation fault when trying to allocate a large memory chunk and cause the service to crash.
Affected software
QEMU
Opensuse
Fedora
qemu
Opensuse
Fedora
qemu
How to mitigate CVE-2018-12617
Install update from vendor's website.
qemu - addressed in versions 2.10.2-1.fc27, 2.11.2-2.fc28