Quick Emulator VNC Display Driver Out-of-Bounds Memory Access Denial of Service Vulnerability [CVE-2017-2633]

A vulnerability in the Virtual Network Computing (VNC) display driver of Quick Emulator (QEMU) could allow an authenticated, remote attacker to cause a denial of service (DoS) condition on a targeted system.

The vulnerability is due to improper memory operations performed by the vnc_refresh_server_surface() function of the affected software. An attacker could exploit this vulnerability by refreshing the VNC display surface area within a guest system. A successful exploit could cause an out-of-bounds memory access condition, which would allow the attacker to crash the QEMU process, resulting in a DoS condition on the affected device.

Proof-of-concept (PoC) code that demonstrates an exploit of this vulnerability is publicly available.

QEMU has confirmed the vulnerability and released software updates.

CVE Number = CVE-2017-2633

Analysis
  • To exploit this vulnerability, the attacker must authenticate to a targeted system, making exploitation difficult in environments that restrict network access from untrusted sources.
Safeguards
  • Administrators are advised to apply the appropriate updates.

    Administrators are advised to allow only trusted users to have network access.

    Administrators are advised to monitor affected systems.

Vendor Announcements
Fixed Software
  • QEMU has released a software update at the following link: QEMU 1.7.2 and later



Duncan Newell

Duncan is a technology professional with over 20 years experience of working in various IT roles. He has a interest in cyber security, and has a wide range of other skills in radio, electronics and telecommunications.

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