#VU10778 NULL pointer dereference in Xen - CVE-2018-7542

Vulnerability identifier: #VU10778

Vulnerability risk: Low

CVSSv4.0: 4.9 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2018-7542

CWE-ID: CWE-476

Exploitation vector: Local network

Exploit availability: No

Vulnerable software:
Xen
Server applications / Virtualization software

Vendor: Xen Project

Description

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

The vulnerability exists due to a NULL pointer dereference in multiple paths without the presence of a Local APIC. An adjacent attacker can crash the hypervisor and cause a denial of service.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Xen: 4.8.0 - 4.8.3

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External links
https://xenbits.xen.org/xsa/advisory-256.html

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

Is there known malware, which exploits this vulnerability?

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