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FreeBSD : xen-tools -- cirrus_bitblt_cputovideo does not check if memory region is safe (8cbd9c08-f8b9-11e6-ae1b-002590263bf5)

critical Nessus Plugin ID 97312

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Synopsis

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

Description

The Xen Project reports :

In CIRRUS_BLTMODE_MEMSYSSRC mode the bitblit copy routine cirrus_bitblt_cputovideo fails to check whether the specified memory region is safe. A malicious guest administrator can cause an out of bounds memory write, very likely exploitable as a privilege escalation.

Solution

Update the affected package.

See Also

http://xenbits.xen.org/xsa/advisory-209.html

http://www.nessus.org/u?5ffe223d

Plugin Details

Severity: Critical

ID: 97312

File Name: freebsd_pkg_8cbd9c08f8b911e6ae1b002590263bf5.nasl

Version: 3.10

Type: local

Published: 2/22/2017

Updated: 12/31/2025

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: High

Score: 7.3

CVSS v2

Risk Factor: High

Base Score: 9

Temporal Score: 6.7

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

CVSS Score Source: CVE-2017-2620

CVSS v3

Risk Factor: Critical

Base Score: 9.9

Temporal Score: 8.6

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

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

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

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

Exploit Ease: No known exploits are available

Patch Publication Date: 2/22/2017

Vulnerability Publication Date: 2/21/2017

Reference Information

CVE: CVE-2017-2620

IAVB: 2017-B-0024-S