#VU9435 Privilege escalation in Xen - CVE-2017-17045

Vulnerability identifier: #VU9435

Vulnerability risk: Low

CVSSv4.0: 6.3 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2017-17045

CWE-ID: CWE-264

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 gain elevated privileges on the target system.

The weakness exists due to improper privileges control. An adjacent attacker can trigger a p2m error checking flaw in the Populate on Demand (PoD) code and gain write access to freed memory and gain elevated privileges on the host system.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Xen: 4.5.0 - 4.9.0

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External links
https://xenbits.xen.org/xsa/advisory-247.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.