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U-253: Citrix XenServer Denial of Service and Privilege Escalation Vulnerabilities

September 7, 2012 - 6:00am

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PROBLEM:

Citrix XenServer Denial of Service and Privilege Escalation Vulnerabilities

PLATFORM:

Citrix XenServer 5.0
Citrix XenServer 5.5
Citrix XenServer 5.6
Citrix XenServer 6.0

ABSTRACT:

Citrix XenServer is prone to a local privilege-escalation vulnerability.

reference LINKS:

Citrix Document ID: CTX134708
Secunia Advisory SA50530
Bugtraq ID:  55432 
CVE-2012-3432
CVE-2012-3433
CVE-2012-3494
CVE-2012-3495
CVE-2012-3496
CVE-2012-3498
CVE-2012-3515
CVE-2012-3516
CVE-2012-4606

IMPACT ASSESSMENT:

High

Discussion:

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)

Impact:

Citrix has acknowledged some vulnerabilities in XenServer, which can be exploited by malicious, local users in a guest virtual machine to cause a DoS (Denial of Service) and gain escalated privileges.

Solution:

The vendor has issued a fix.

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