#VU15586 Memory corruption in Xen - CVE-2018-5244

Vulnerability identifier: #VU15586

Vulnerability risk: Low

CVSSv4.0: 2 [CVSS:4.0/AV:A/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:H/E:U/U:Clear]

CVE-ID: CVE-2018-5244

CWE-ID: CWE-119

Exploitation vector: Local network

Exploit availability: No

Vulnerable software:
Xen
Server applications / Virtualization software

Vendor: Xen Project

Description

The vulnerability allows an adjacent administrative attacker to cause DoS condition on the guest system.

The vulnerability exists due to one tracking structure isn't freed when a vcpu is destroyed as new infrastructure was introduced as part of an overhaul to how MSR emulation happens for guests. A remote attacker can trigger host OS memory consumption and cause the system to crash by rebooting many times.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Xen: 4.10.0

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External links
https://xenbits.xenproject.org/xsa/advisory-253.html

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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.