SB2018090636 - Denial of service in xen (Alpine package)
Published: September 6, 2018
Security Bulletin ID
SB2018090636
Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Adjecent network
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Denial of service (CVE-ID: CVE-2018-15468)
The vulnerability allows an adjacent administrative attacker to cause DoS condition on the target system.
The vulnerability exists due to the DEBUGCTL MSR contains several debugging features, some of which virtualise cleanly, but some do not when Branch Trace Store is not virtualised by the processor. An adjacent attacker can lock up the entire host, choose any MSR_DEBUGCTL setting it likes and cause the service to crash.
Remediation
Install update from vendor's website.
References
- https://git.alpinelinux.org/aports/commit/?id=fa4aef12fe69b28f195024708e67ea7e48e9fca6
- https://git.alpinelinux.org/aports/commit/?id=8a2e635d73f2f09c768259b4730dcf3f55d0ed93
- https://git.alpinelinux.org/aports/commit/?id=ca1b59327d93bdc40e475877934ab83be23847f1
- https://git.alpinelinux.org/aports/commit/?id=74dce6e0451466b8eb5078660886cc226f9704f4