Incorrect Authorization Affecting xen package, versions <4.11.1-r0
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Test your applications- Snyk ID SNYK-ALPINE320-XEN-7012344
- published 23 May 2024
- disclosed 17 Aug 2018
Introduced: 17 Aug 2018
CVE-2018-15468 Open this link in a new tabHow to fix?
Upgrade Alpine:3.20 xen to version 4.11.1-r0 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream xen package and not the xen package as distributed by Alpine.
See How to fix? for Alpine:3.20 relevant fixed versions and status.
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.