CVE-2017-7718 Denial of service in n/a

Medium 5.5 Published 20 Apr 2017 Updated 5 Aug 2024

A local privileged guest user can crash the QEMU process via an out-of-bounds read in the Cirrus VGA emulation code.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Local or same network only
Victim action needed: Not needed
Fix: Available

What is CVE-2017-7718?

CVE-2017-7718 is a medium-severity denial of service vulnerability in Debian Debian Linux, published on 20 Apr 2017. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

hw/display/cirrus_vga_rop.h in QEMU (aka Quick Emulator) allows local guest OS privileged users to cause a denial of service (out-of-bounds read and QEMU process crash) via vectors related to copying VGA data via the cirrus_bitblt_rop_fwd_transp_ and cirrus_bitblt_rop_fwd_ functions.

Weakness: CWE-125

Which versions are affected by CVE-2017-7718?

It affects 2 products.

Linux distribution packages (5)

`qemu-img-rhev` Red Hat:enterprise_linux:7::hypervisor	All versions	`10:2.6.0-28.el7_3.10`
`qemu-kvm-common-rhev` Red Hat:enterprise_linux:7::hypervisor	All versions	`10:2.6.0-28.el7_3.10`
`qemu-kvm-rhev` Red Hat:enterprise_linux:7::hypervisor	All versions	`10:2.6.0-28.el7_3.10`
`qemu-kvm-rhev-debuginfo` Red Hat:enterprise_linux:7::hypervisor	All versions	`10:2.6.0-28.el7_3.10`
`qemu-kvm-tools-rhev` Red Hat:enterprise_linux:7::hypervisor	All versions	`10:2.6.0-28.el7_3.10`

Products include Debian Debian Linux, Qemu Qemu.

How do I fix CVE-2017-7718?

Apply the vendor's patch.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2017-7718 being exploited?

There is no known exploitation of CVE-2017-7718 in the wild and no public exploit code.

All Debian Debian Linux vulnerabilities

Sources

Also known as DEBIAN-CVE-2017-7718, GHSA-grqv-x6q8-x92g, RHSA-2017:1431, UBUNTU-CVE-2017-7718.