A number of security vulnerabilities have been identified in Citrix XenServer. These vulnerabilities affect all currently supported versions of Citrix XenServer up to and including version 6.0.2.
The following denial of service and guest-to-host privilege escalation vulnerabilities have been addressed:
• hypercall physdev_get_free_pirq vulnerability (CVE-2012-3495)
• PHYSDEVOP_map_pirq index vulnerability (CVE-2012-3498)
• Qemu VT100 emulation vulnerability (CVE-2012-3515)
• Grant table entry swaps have inadequate bounds checking (CVE-2012-3516)
• HVM guest user mode MMIO emulation DoS vulnerability (CVE-2012-3432)
• HVM guest destroy p2m teardown host DoS vulnerability (CVE-2012-3433)
• hypercall set_debugreg vulnerability (CVE-2012-3494)
• XENMEM_populate_physmap DoS vulnerability (CVE-2012-3496)
• PV guest console vulnerability (CVE-2012-4606)
What Customers Should Do
Hotfixes have been released to address these issues in all supported versions and update levels of Citrix XenServer. Citrix strongly recommends that customers using Citrix XenServer identify and apply the hotfixes that relate to their deployed versions:
Citrix XenServer 6.0.2: http://support.citrix.com/article/ctx134753
Citrix XenServer 6.0.0: http://support.citrix.com/article/ctx134752
Citrix XenServer 5.6 Service Pack 2: http://support.citrix.com/article/ctx134751
Citrix XenServer 5.6 Feature Pack 1: http://support.citrix.com/article/ctx134750
Citrix XenServer 5.6: http://support.citrix.com/article/ctx134748
Citrix XenServer 5.5 Update 2: http://support.citrix.com/article/ctx134747
Citrix XenServer 5.0 Update 3: http://support.citrix.com/article/ctx134746
Customers using Citrix XenServer 5.6 in the Common Criteria evaluated configuration should apply the following hotfix: http://support.citrix.com/article/ctx134749
Citrix thanks James Forshaw of Context IS (www.contextis.com) for working with us to protect Citrix customers.
Read the entire article here.