FreeBSD : xen-kernel -- use after free in FIFO event channel code (4bf57137-ba4d-11e6-ae1b-002590263bf5)

medium Nessus Plugin ID 95503

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Synopsis

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

Description

The Xen Project reports :

When the EVTCHNOP_init_control operation is called with a bad guest frame number, it takes an error path which frees a control structure without also clearing the corresponding pointer. Certain subsequent operations (EVTCHNOP_expand_array or another EVTCHNOP_init_control), upon finding the non-NULL pointer, continue operation assuming it points to allocated memory.

A malicious guest administrator can crash the host, leading to a DoS.
Arbitrary code execution (and therefore privilege escalation), and information leaks, cannot be excluded.

Solution

Update the affected package.

Plugin Details

Severity: Medium

ID: 95503

File Name: freebsd_pkg_4bf57137ba4d11e6ae1b002590263bf5.nasl

Version: 3.3

Type: local

Family: FreeBSD Local Security Checks

Published: 12/5/2016

Updated: 1/4/2021

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: High

Base Score: 7.2

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

CVSS v3

Risk Factor: Medium

Base Score: 6.7

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

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: 12/4/2016

Vulnerability Publication Date: 9/8/2016

Reference Information

CVE: CVE-2016-7154

Detections

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