FreeBSD : xen-kernel -- information leak in legacy x86 FPU/XMM initialization (e839ca04-b40d-11e5-9728-002590263bf5)

high Nessus Plugin ID 87752
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Synopsis

The remote FreeBSD host is missing a security-related update.

Description

The Xen Project reports :

When XSAVE/XRSTOR are not in use by Xen to manage guest extended register state, the initial values in the FPU stack and XMM registers seen by the guest upon first use are those left there by the previous user of those registers.

A malicious domain may be able to leverage this to obtain sensitive information such as cryptographic keys from another domain.

Solution

Update the affected package.

See Also

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=205841

http://xenbits.xen.org/xsa/advisory-165.html

http://www.nessus.org/u?93a51629

Plugin Details

Severity: High

ID: 87752

File Name: freebsd_pkg_e839ca04b40d11e59728002590263bf5.nasl

Version: 2.5

Type: local

Published: 1/6/2016

Updated: 1/4/2021

Dependencies: ssh_get_info.nasl

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Medium

Base Score: 5

Vector: AV:N/AC:L/Au:N/C:P/I:N/A:N

CVSS v3

Risk Factor: High

Base Score: 8.6

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

Vulnerability Information

CPE: p-cpe:/a:freebsd:freebsd:xen-kernel, cpe:/o:freebsd:freebsd

Required KB Items: Host/local_checks_enabled, Host/FreeBSD/release, Host/FreeBSD/pkg_info

Patch Publication Date: 1/6/2016

Vulnerability Publication Date: 12/17/2015

Reference Information

CVE: CVE-2015-8555