QEMU VNC password security bypass

qemu-vnc-security-bypass (65215) The risk level is classified as MediumMedium Risk

Description:

QEMU could allow a remote attacker to bypass security restrictions, caused by a failure to reject access when a blank VNC password is configured. An attacker to exploit this vulnerability to gain unauthorized access to the system.

*CVSS:

Base Score: 9.3
  Access Vector: Network
  Access Complexity: Medium
  Authentication: None
  Confidentiality Impact: Complete
  Integrity Impact: Complete
  Availability Impact: Complete
 
Temporal Score: 8.1
  Exploitability: High
  Remediation Level: Official-Fix
  Report Confidence: Confirmed

Consequences:

Bypass Security

Remedy:

Apply the appropriate patch for your system. See References.

References:

  • QEMU Web site: QEMU.
  • Ubuntu Bug #697197 : Empty password allows access to VNC in libvirt.
  • BID-45743: QEMU KVM VNC Password Security Bypass Vulnerability
  • CVE-2011-0011: qemu-kvm before 0.11.0 disables VNC authentication when the password is cleared, which allows remote attackers to bypass authentication and establish VNC sessions.
  • DSA-2230: qemu-kvm -- several vulnerabilities
  • OSVDB ID: 70992: QEMU Empty VNC Password Authentication Bypass
  • RHSA-2011-0345: Moderate: qemu-kvm security update
  • SA42830: QEMU Empty VNC Password Authentication Bypass Security Issue

Platforms Affected:

  • Fabrice Bellard QEMU
  • RedHat Enterprise Linux 6 Server
  • RedHat Enterprise Linux 6 Workstation
  • RedHat Enterprise Linux Desktop 6
  • RedHat Enterprise Linux HPC Node 6
  • RedHat Enterprise Linux Server EUS 6.0.z

Reported:

Jan 04, 2011

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The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall IBM be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.

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