Xen 'drivers/xen/blkback/blkback.c' Local Denial Of Service Vulnerability

Bugtraq ID:	45029
Class:	Input Validation Error
CVE:	CVE-2010-4247
Remote:	No
Local:	Yes
Published:	Nov 23 2010 12:00AM
Updated:	Mar 19 2015 09:26AM
Credit:	Keir Fraser
Vulnerable:	XenSource Xen 3.3.1 XenSource Xen 3.3 XenSource Xen 3.2 XenSource Xen 3.1.2 XenSource Xen 3.1.1 XenSource Xen 3.0.3 XenSource Xen 3.0 VMWare ESX 4.1 VMWare ESX 4.0 Ubuntu Ubuntu Linux 8.04 LTS sparc Ubuntu Ubuntu Linux 8.04 LTS powerpc Ubuntu Ubuntu Linux 8.04 LTS lpia Ubuntu Ubuntu Linux 8.04 LTS i386 Ubuntu Ubuntu Linux 8.04 LTS amd64 Red Hat Enterprise Linux Desktop 5 client Red Hat Enterprise Linux 5 Server OpenVZ Project OpenVZ 028stab081.1 Avaya Voice Portal 5.1 Avaya Voice Portal 5.1 Avaya Voice Portal 5.0 SP2 Avaya Voice Portal 5.0 SP1 Avaya Voice Portal 5.0 Avaya IQ 5.1 Avaya IQ 5 Avaya IP Office Application Server 6.1 Avaya Communication Server 1000M Signaling Server 7.5 Avaya Communication Server 1000M Signaling Server 7.0 Avaya Communication Server 1000M Signaling Server 6.0 Avaya Communication Server 1000M 7.5 Avaya Communication Server 1000M 7.0 Avaya Communication Server 1000M 6.0 Avaya Communication Server 1000E Signaling Server 7.5 Avaya Communication Server 1000E Signaling Server 7.0 Avaya Communication Server 1000E Signaling Server 6.0 Avaya Communication Server 1000E 7.5 Avaya Communication Server 1000E 7.0 Avaya Communication Server 1000E 6.0 Avaya Aura System Platform 6.0 Avaya Aura System Platform 1.1 Avaya Aura System Manager 6.1 Avaya Aura System Manager 6.0 SP1 Avaya Aura System Manager 6.0 Avaya Aura System Manager 5.2 Avaya Aura Session Manager 6.0 Avaya Aura Session Manager 5.2 Avaya Aura Session Manager 1.1 Avaya Aura Presence Services 6.0 Avaya Aura Conferencing 6.0 Standard Avaya Aura Communication Manager 6.0.1 + Avaya Communication Manager Server DEFINITY Server SI/CS + Avaya Communication Manager Server S8100 + Avaya Communication Manager Server S8300 + Avaya Communication Manager Server S8500 + Avaya Communication Manager Server S8700 Avaya Aura Communication Manager 6.0 + Avaya Communication Manager Server DEFINITY Server SI/CS + Avaya Communication Manager Server S8100 + Avaya Communication Manager Server S8300 + Avaya Communication Manager Server S8500 + Avaya Communication Manager Server S8700 Avaya Aura Communication Manager 5.2 + Avaya Communication Manager Server DEFINITY Server SI/CS + Avaya Communication Manager Server S8100 + Avaya Communication Manager Server S8300 + Avaya Communication Manager Server S8500 + Avaya Communication Manager Server S8700 Avaya Aura Application Server 2.1 Avaya Aura Application Server 2.0 Avaya Aura Application Enablement Services 5.2.1 Avaya Aura Application Enablement Services 5.2
Not Vulnerable:	OpenVZ Project OpenVZ 028stab085.2

Xen 'drivers/xen/blkback/blkback.c' Local Denial Of Service Vulnerability

Xen is prone to a denial-of-service vulnerability because the application fails to properly validate user-supplied input.

An attacker with access to a guest operating system can exploit this issue to trigger excessive CPU consumption on the host operating system via an endless loop, effectively denying service to legitimate users.

Xen 'drivers/xen/blkback/blkback.c' Local Denial Of Service Vulnerability

Attackers can use readily available tools to exploit this issue.

Xen 'drivers/xen/blkback/blkback.c' Local Denial Of Service Vulnerability

Solution:
Updates are available. Please see the references for more information.

Xen 'drivers/xen/blkback/blkback.c' Local Denial Of Service Vulnerability

References:

• changeset: blkback/blktap: Check for kthread_should_stop() in inner loop, (Keir Fraser)
  
• changeset: blkback: Request-processing loop is unbounded and hence requires a (Keir Fraser)
  
• Download/kernel/rhel5/028stab085.2 (OpenVZ)
  
• XenSource Homepage (XenSource)
  
• ASA-2011-020 kernel security, bug fix, and enhancement update (RHSA-2011-0004) (Avaya)