Xen Hypervisor xenstored Write Saturation DoS (XSA-206)

Low Nessus Plugin ID 99398


The remote Xen hypervisor installation is missing a security update.


According to its self-reported version number, the Xen hypervisor installed on the remote host is affected by a denial of service vulnerability in xenstored during processing of transactions. An attacker on the guest can exploit this vulnerability by issuing repeated writes to xenstore that conflict with transactions either of the toolstack or backends, such as the driver domain, causing the transactions made by these entities to fail indefinitely.

Note that Nessus has checked the changeset versions based on the xen.git change log. Nessus did not check guest hardware configurations or if patches were applied manually to the source code before a recompile and reinstall.


Apply the appropriate patch according to the vendor advisory.

See Also



Plugin Details

Severity: Low

ID: 99398

File Name: xen_server_XSA-206.nasl

Version: $Revision: 1.2 $

Type: local

Family: Misc.

Published: 2017/04/14

Modified: 2017/08/16

Dependencies: 78089

Risk Information

Risk Factor: Low


Base Score: 1.9

Temporal Score: 1.4

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

Temporal Vector: CVSS2#E:U/RL:OF/RC:C


Base Score: 2.5

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

Vulnerability Information

CPE: cpe:/o:xen:xen

Required KB Items: installed_sw/Xen Hypervisor, Settings/ParanoidReport

Exploit Available: false

Exploit Ease: No known exploits are available

Patch Publication Date: 2017/03/28

Vulnerability Publication Date: 2017/03/28

Reference Information

BID: 97250

OSVDB: 154806