CVE-2018-7858 : Security Advisory and Response

Quick Emulator (QEMU) vulnerability related to incorrect calculation of the display region when updating the VGA display.

Understanding CVE-2018-7858

A local guest operating system privileged user can exploit this vulnerability to cause a denial of service in QEMU.

What is CVE-2018-7858?

QEMU vulnerability due to incorrect display region calculation with Cirrus CLGD 54xx VGA Emulator support
Allows a local guest OS privileged user to trigger a denial of service

The Impact of CVE-2018-7858

Results in an out-of-bounds access leading to QEMU process crash

Technical Details of CVE-2018-7858

Vulnerability details and affected systems.

Vulnerability Description

QEMU vulnerability when built with Cirrus CLGD 54xx VGA Emulator support
Exploitable by local guest OS privileged users

Affected Systems and Versions

Product: n/a
Vendor: n/a
Version: n/a

Exploitation Mechanism

Incorrect calculation of the display region when updating the VGA display
Specifically related to QEMU with Cirrus CLGD 54xx VGA Emulator support

Mitigation and Prevention

Steps to mitigate and prevent exploitation of CVE-2018-7858.

Immediate Steps to Take

Apply vendor patches and updates promptly
Monitor vendor advisories for security patches

Long-Term Security Practices

Regularly update and patch QEMU installations
Implement least privilege access controls

Patching and Updates

Update QEMU to the latest version
Apply security patches provided by the vendor