Xen XENMEM_exchange privilege escalation

xen-xenmemexchange-priv-esc (80482) The risk level is classified as HighHigh Risk

Description:

Xen could allow a local attacker to gain elevated privileges on the system, caused by the failure to range check the guest provided addresses by the XENMEM_exchange handler. An attacker could exploit this vulnerability to include the hypervisor reserved range and gain elevated privileges on the system.

*CVSS:

Base Score: 4.6
  Access Vector: Local
  Access Complexity: Low
  Authentication: None
  Confidentiality Impact: Partial
  Integrity Impact: Partial
  Availability Impact: Partial
 
Temporal Score: 3.4
  Exploitability: Unproven
  Remediation Level: Official-Fix
  Report Confidence: Confirmed

Consequences:

Gain Privileges

Remedy:

Refer to Xen Security Advisory 29 for patch, upgrade or suggested workaround information. See References.

For other distributions:
Apply the appropriate update for your system. See References.

References:

  • CTX135777: Citrix XenServer Multiple Security Updates.
  • Xen Security Advisory 29: XENMEM_exchange may overwrite hypervisor memory.
  • BID-56797: Xen 'XENMEM_exchange' Local Privilege Escalation Vulnerability
  • CVE-2012-5513: The XENMEM_exchange handler in Xen 4.2 and earlier does not properly check the memory address, which allows local PV guest OS administrators to cause a denial of service (crash) or possibly gain privileges via unspecified vectors that overwrite memory in the hypervisor reserved range.
  • DSA-2582: xen -- several vulnerabilities
  • OSVDB ID: 88131: Xen XENMEM_exchange Handler Guest Memory Overwrite Local Privilege Escalation
  • RHSA-2012-1540: Important: kernel security, bug fix, and enhancement update
  • SA51397: Xen Multiple Vulnerabilities
  • SA51486: Citrix XenServer Multiple Vulnerabilities

Platforms Affected:

  • Citrix XenServer 5.0
  • Citrix XenServer 5.5
  • Citrix XenServer 5.6
  • Citrix XenServer 6.0
  • Citrix XenServer 6.1
  • RedHat Enterprise Linux 5 Client
  • RedHat Enterprise Linux 5
  • XenSource Xen 3.0
  • XenSource Xen 4.1
  • XenSource Xen 4.1.1
  • XenSource Xen 4.1.2

Reported:

Dec 03, 2012

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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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