Division by zero in QEMU - CVE-2016-8669
Published: November 4, 2016 / Updated: August 9, 2020
Vulnerability identifier: #VU40050
CSH Severity: Low
CVSS v4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2016-8669
CWE-ID: CWE-369
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local privileged user to a crash the entire system.
The serial_update_parameters function in hw/char/serial.c in QEMU (aka Quick Emulator) allows local guest OS administrators to cause a denial of service (divide-by-zero error and QEMU process crash) via vectors involving a value of divider greater than baud base.
Affected software
QEMU
Fedora
xen
Fedora
xen
How to mitigate CVE-2016-8669
Install update from vendor's website.
xen - addressed in versions 4.5.5-3.fc23, 4.6.3-7.fc24, 4.7.0-7.fc25
External References
- http://git.qemu.org/?p=qemu.git;a=commit;h=3592fe0c919cf27a81d8e9f9b4f269553418bb01
- http://lists.opensuse.org/opensuse-updates/2016-12/msg00140.html
- http://www.openwall.com/lists/oss-security/2016/10/14/9
- http://www.openwall.com/lists/oss-security/2016/10/15/5
- http://www.securityfocus.com/bid/93563
- https://access.redhat.com/errata/RHSA-2017:2392
- https://access.redhat.com/errata/RHSA-2017:2408
- https://lists.debian.org/debian-lts-announce/2018/09/msg00007.html
- https://security.gentoo.org/glsa/201611-11