Denial of service in xen (Alpine package)



Published: 2018-09-06
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2018-15468
CWE-ID CWE-264
Exploitation vector Local network
Public exploit N/A
Vulnerable software
Subscribe 		xen (Alpine package)
Operating systems & Components / Operating system package or component

Vendor Alpine Linux Development Team

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Denial of service

EUVDB-ID: #VU14476

Risk: Low

CVSSv3.1: 3.9 [CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-15468

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

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.

Mitigation

Install update from vendor's website.

Vulnerable software versions

xen (Alpine package): 4.8.4-r0

CPE2.3 External links

http://git.alpinelinux.org/aports/commit/?id=fa4aef12fe69b28f195024708e67ea7e48e9fca6
http://git.alpinelinux.org/aports/commit/?id=8a2e635d73f2f09c768259b4730dcf3f55d0ed93
http://git.alpinelinux.org/aports/commit/?id=ca1b59327d93bdc40e475877934ab83be23847f1
http://git.alpinelinux.org/aports/commit/?id=74dce6e0451466b8eb5078660886cc226f9704f4


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated privileged user via the local network (LAN).

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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