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FreeBSD : xen-kernel -- leak of per-domain profiling-related vcpu pointer array (e3792855-881f-11e5-ab94-002590263bf5)

medium Nessus Plugin ID 86840

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Synopsis

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

Description

The Xen Project reports :

A domain's xenoprofile state contains an array of per-vcpu information... This array is leaked on domain teardown. This memory leak could -- over time -- exhaust the host's memory.

The following parties can mount a denial of service attack affecting the whole system :

- A malicious guest administrator via XENOPROF_get_buffer.

- A domain given suitable privilege over another domain via XENOPROF_set_passive (this would usually be a domain being used to profile another domain, eg with the xenoprof tool).

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.

Solution

Update the affected package.

See Also

http://xenbits.xen.org/xsa/advisory-151.html

http://www.nessus.org/u?2220cb94

Plugin Details

Severity: Medium

ID: 86840

File Name: freebsd_pkg_e3792855881f11e5ab94002590263bf5.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