#VU7150 Denial of service in Xen - CVE-2017-10923

Vulnerability identifier: #VU7150

Vulnerability risk: Low

CVSSv4.0: 1.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2017-10923

CWE-ID: CWE-284

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Xen
Server applications / Virtualization software

Vendor: Xen Project

Description
The vulnerability allows a local attacker to cause DoS condition on the host system.

The weakness exists due to array access error. A local user on the guest system can send specially crafted software generated interrupts to vCPUS that use the MMIO register GICD_SGIR (GICv2) or System Register ICC_SGI1R (GICv3) and cause the hypervisor to crash.

Successful exploitation of the vulnerability results in denial of service.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Xen: 4.6.0 - 4.8.1

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External links
https://xenbits.xen.org/xsa/advisory-225.html

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

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