Denial of service in Xen

1) Null pointer dereference

EUVDB-ID: #VU15697

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-2018-18883

CWE-ID: CWE-476 - NULL Pointer Dereference

Exploit availability: No

Description

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

The vulnerability exists due to NULL pointer dereference when handling malicious input. A x86 HVM and PVH guest can send specially crafted content, execute arbitrary virtualization instructions, trigger null pointer deference and cause the service to crash on the host system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Xen: 4.9.0 - 4.11.0

CPE2.3

• cpe:2.3:a:xen_project:xen:4.9.0:*:*:*:*:*:*:*
• cpe:2.3:a:xen_project:xen:4.9.1:*:*:*:*:*:*:*
• cpe:2.3:a:xen_project:xen:4.9.2:*:*:*:*:*:*:*

External links

https://xenbits.xen.org/xsa/advisory-278.html

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.