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CVE
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CVE-2018-15468Date: (C)2018-08-20   (M)2024-02-22


An issue was discovered in Xen through 4.11.x. The DEBUGCTL MSR contains several debugging features, some of which virtualise cleanly, but some do not. In particular, Branch Trace Store is not virtualised by the processor, and software has to be careful to configure it suitably not to lock up the core. As a result, it must only be available to fully trusted guests. Unfortunately, in the case that vPMU is disabled, all value checking was skipped, allowing the guest to choose any MSR_DEBUGCTL setting it likes. A malicious or buggy guest administrator (on Intel x86 HVM or PVH) can lock up the entire host, causing a Denial of Service.

CVSS Score and Metrics +CVSS Score and Metrics -

CVSS V3 Severity:CVSS V2 Severity:
CVSS Score : 6.0CVSS Score : 4.9
Exploit Score: 1.5Exploit Score: 3.9
Impact Score: 4.0Impact Score: 6.9
 
CVSS V3 Metrics:CVSS V2 Metrics:
Attack Vector: LOCALAccess Vector: LOCAL
Attack Complexity: LOWAccess Complexity: LOW
Privileges Required: HIGHAuthentication: NONE
User Interaction: NONEConfidentiality: NONE
Scope: CHANGEDIntegrity: NONE
Confidentiality: NONEAvailability: COMPLETE
Integrity: NONE 
Availability: HIGH 
  
Reference:
GLSA-201810-06
http://xenbits.xen.org/xsa/advisory-269.html

CWE    1
CWE-863
OVAL    8
oval:org.secpod.oval:def:89002176
oval:org.secpod.oval:def:603490
oval:org.secpod.oval:def:89049689
oval:org.secpod.oval:def:89002043
...

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