Xen TMEM privilege escalation

xen-tmem-priv-esc (78268) 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 improper validation of input or the privilege of the calling guest by the Transcendent Memory (TMEM) hypercall. A local attacker could exploit this vulnerability to gain elevated privileges on the system or cause the hypervisor to crash.

*CVSS:

Base Score: 4.4
  Access Vector: Local
  Access Complexity: Medium
  Authentication: None
  Confidentiality Impact: Partial
  Integrity Impact: Partial
  Availability Impact: Partial
 
Temporal Score: 3.3
  Exploitability: Unproven
  Remediation Level: Official-Fix
  Report Confidence: Confirmed

Consequences:

Gain Privileges

Remedy:

Refer to Xen Security Advisory 15 (CVE-2012-3497) for patch, upgrade or suggested workaround information. See References.

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

References:

  • CTX134708: Citrix XenServer Multiple Security Updates.
  • Xen Security Advisory 15 (CVE-2012-3497) : multiple TMEM hypercall vulnerabilities.
  • BID-55410: Xen 'TMEM hypercall' Multiple Security Vulnerabilities
  • CVE-2012-3497: (1) TMEMC_SAVE_GET_CLIENT_WEIGHT, (2) TMEMC_SAVE_GET_CLIENT_CAP, (3) TMEMC_SAVE_GET_CLIENT_FLAGS and (4) TMEMC_SAVE_END in the Transcendent Memory (TMEM) in Xen 4.0, 4.1, and 4.2 allow local guest OS users to cause a denial of service (NULL pointer dereference or memory corruption and host crash) or possibly have other unspecified impacts via a NULL client id.
  • CVE-2012-6030: The do_tmem_op function in the Transcendent Memory (TMEM) in Xen 4.0, 4.1, and 4.2 allow local guest OS users to cause a denial of service (host crash) and possibly have other unspecified impacts via unspecified vectors related to broken locking checks in an error path. NOTE: this issue was originally published as part of CVE-2012-3497, which was too general; CVE-2012-3497 has been SPLIT into this ID and others.
  • CVE-2012-6031: The do_tmem_get function in the Transcendent Memory (TMEM) in Xen 4.0, 4.1, and 4.2 allow local guest OS users to cause a denial of service (CPU hang and host crash) via unspecified vectors related to a spinlock being held in the bad_copy error path. NOTE: this issue was originally published as part of CVE-2012-3497, which was too general; CVE-2012-3497 has been SPLIT into this ID and others.
  • CVE-2012-6036: The (1) memc_save_get_next_page, (2) tmemc_restore_put_page and (3) tmemc_restore_flush_page functions in the Transcendent Memory (TMEM) in Xen 4.0, 4.1, and 4.2 do not check for negative id pools, which allows local guest OS users to cause a denial of service (memory corruption and host crash) or possibly execute arbitrary code via unspecified vectors. NOTE: this issue was originally published as part of CVE-2012-3497, which was too general; CVE-2012-3497 has been SPLIT into this ID and others.
  • OSVDB ID: 85199: Xen Transcendent Memory (TMEM) Hypercall Multiple Sub-operation Validation Weakness Local Privilege Escalation
  • SA50472: Xen Multiple Denial of Service and Privilege Escalation Vulnerabilities
  • SA50530: Citrix XenServer Denial of Service and Privilege Escalation Vulnerabilities

Platforms Affected:

  • Citrix XenServer 5.0
  • Citrix XenServer 5.5
  • Citrix XenServer 5.6
  • Citrix XenServer 6.0
  • XenSource Xen 4.1
  • XenSource Xen 4.1.1
  • XenSource Xen 4.1.2

Reported:

Sep 05, 2012

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