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FreeBSD : xen-tools -- oob access in cirrus bitblt copy (a73aba9a-effe-11e6-ae1b-002590263bf5)

critical Nessus Plugin ID 97109

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Synopsis

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

Description

The Xen Project reports :

When doing bitblt copy backwards, qemu should negate the blit width.
This avoids an oob access before the start of video memory.

A malicious guest administrator can cause an out of bounds memory access, possibly leading to information disclosure or privilege escalation.

Solution

Update the affected package.

See Also

http://xenbits.xen.org/xsa/advisory-208.html

http://www.nessus.org/u?3ec9e5f8

Plugin Details

Severity: Critical

ID: 97109

File Name: freebsd_pkg_a73aba9aeffe11e6ae1b002590263bf5.nasl

Version: 3.6

Type: local

Published: 2/13/2017

Updated: 6/3/2021

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: High

Score: 7.3

CVSS v2

Risk Factor: High

Base Score: 9

Vector: CVSS2#AV:N/AC:L/Au:S/C:C/I:C/A:C

CVSS v3

Risk Factor: Critical

Base Score: 9.1

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

Vulnerability Information

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

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

Patch Publication Date: 2/11/2017

Vulnerability Publication Date: 2/10/2017

Reference Information

CVE: CVE-2017-2615

IAVB: 2017-B-0024-S