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FreeBSD : xen-kernel -- leak of main per-domain vcpu pointer array (fc1f8795-881d-11e5-ab94-002590263bf5)

medium Nessus Plugin ID 86842

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Synopsis

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

Description

The Xen Project reports :

A domain's primary array of vcpu pointers can be allocated by a toolstack exactly once in the lifetime of a domain via the XEN_DOMCTL_max_vcpus hypercall. This array is leaked on domain teardown. This memory leak could -- over time -- exhaust the host's memory.

A domain given partial management control via XEN_DOMCTL_max_vcpus can mount a denial of service attack affecting the whole system. The ability to also restart or create suitable domains is also required to fully exploit the issue. Without this the leak is limited to a small multiple of the maximum number of vcpus for the domain. The maximum leak is 64kbytes per domain (re)boot (less on ARM).

Solution

Update the affected package.

See Also

http://xenbits.xen.org/xsa/advisory-149.html

http://www.nessus.org/u?a6767de3

Plugin Details

Severity: Medium

ID: 86842

File Name: freebsd_pkg_fc1f8795881d11e5ab94002590263bf5.nasl

Version: 2.4

Type: local

Published: 11/11/2015

Updated: 1/6/2021

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.0

CVSS v2

Risk Factor: Medium

Base Score: 4.9

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

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: 11/11/2015

Vulnerability Publication Date: 10/29/2015

Reference Information

CVE: CVE-2015-7969