#VU8830 Information disclosure in Xen - CVE-2017-15589

Vulnerability identifier: #VU8830

Vulnerability risk: Low

CVSSv4.0: 1.3 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2017-15589

CWE-ID: CWE-200

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 obtain potentially sensitive information.

The weakness exists in the I/O intercept code on x86 HVM systems due to improper security restrictions during I/O operations. During I/O operations, a write path where data is stored in an internal structure could contain bits from an uninitialized Hypervisor stack slot that allows adjacent attacker to access arbitrary data.

Successful exploitation of the vulnerability may result in further attack.

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-239.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.