Xen 'get_free_port()' Denial of Service Vulnerability

Bugtraq ID:	48048
Class:	Boundary Condition Error
CVE:	CVE-2011-1763
Remote:	No
Local:	Yes
Published:	May 31 2011 12:00AM
Updated:	Jan 31 2012 09:40AM
Credit:	Petr Matousek
Vulnerable:	XenSource Xen 0 VMWare ESX 4.1 VMWare ESX 4.0 RedHat Enterprise Linux 5.0 Red Hat Enterprise Linux Desktop 5 client Red Hat Enterprise Linux 5 Server OpenVZ Project OpenVZ 028stab089.1 OpenVZ Project OpenVZ 028stab085.2 OpenVZ Project OpenVZ 028stab081.1 Avaya Voice Portal 5.1 SP1 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 5.2 Avaya IQ 5.1 Avaya IQ 5 Avaya IP Office Application Server 7.0 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 6.0.2 Avaya Aura System Platform 6.0.1 Avaya Aura System Platform 6.0 SP3 Avaya Aura System Platform 6.0 SP2 Avaya Aura System Platform 6.0 Avaya Aura System Platform 1.1 Avaya Aura System Manager 6.1.1 Avaya Aura System Manager 6.1 SP2 Avaya Aura System Manager 6.1 Sp1 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 6.1 SP2 Avaya Aura Session Manager 6.1 Sp1 Avaya Aura Session Manager 6.1 Avaya Aura Session Manager 6.0 SP1 Avaya Aura Session Manager 6.0 Avaya Aura Session Manager 5.2 SP2 Avaya Aura Session Manager 5.2 SP1 Avaya Aura Session Manager 5.2 Avaya Aura Session Manager 1.1 Avaya Aura Presence Services 6.1 Avaya Aura Presence Services 6.0 Avaya Aura Conferencing 6.0 Standard Avaya Aura Communication Manager Utility Services 6.1 + 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 Utility Services 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 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 5300 SIP Core 2.0 Avaya Aura Application Enablement Services 5.2.1 Avaya Aura Application Enablement Services 6.1 Avaya Aura Application Enablement Services 5.2.3 Avaya Aura Application Enablement Services 5.2.2 Avaya Aura Application Enablement Services 5.2
Not Vulnerable:	OpenVZ Project OpenVZ 028stab091.1

Xen 'get_free_port()' Denial of Service Vulnerability

Xen is prone to a denial-of-service vulnerability.

Attackers with DomU user privileges can exploit this issue to cause the application to crash, denying service to legitimate users. Privilege escalation may also be possible; however, this has not been confirmed.

Xen 'get_free_port()' Denial of Service Vulnerability

Currently, we are not aware of any working exploits. If you feel we are in error or if you are aware of more recent information, please mail us at: [email protected].

Xen 'get_free_port()' Denial of Service Vulnerability

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

Xen 'get_free_port()' Denial of Service Vulnerability

References:

• Bug 701240: CVE-2011-1763 kernel: xen: improper upper boundary check (Red Hat)
  
• changeset 19365:2dcdd2fcb945 - Fix MAX_EVTCHNS() definition (XenSource)
  
• Download/kernel/rhel5/028stab091.1 (OpenVZ)
  
• OpenVZ Homepage (OpenVZ)
  
• VMSA-2012-0001 (VMWare)
  
• XenSource Homepage (XenSource)
  
• ASA-2011-208 kernel security and bug fix update (RHSA-2011-0833) (Avaya)