Citrix XenServer Multiple Infinite Loop Guest-to-Host DoS (CTX202583)

Medium Nessus Plugin ID 87012

Synopsis

The remote host is affected by multiple denial of service vulnerabilities.

Description

The version of Citrix XenServer running on the remote host is affected by multiple denial of service vulnerabilities :

- An infinite loop condition exists in the KVM subsystem that is triggered when handling a stream of #AC (Alignment Check) exceptions. A local attacker within a virtualized guest can exploit this to cause a host OS panic or hang, resulting in a denial of service condition. (CVE-2015-5307)

- An infinite loop condition exists in the KVM subsystem that is triggered when handling a stream of #DB (Debug) exceptions. A local attacker within a virtualized guest can exploit this to cause a host OS panic or hang, resulting in a denial of service condition.
(CVE-2015-8104)

Solution

Apply the relevant hotfix referenced in the vendor advisory.

See Also

https://support.citrix.com/article/CTX202583

Plugin Details

Severity: Medium

ID: 87012

File Name: citrix_xenserver_CTX202583.nasl

Version: 1.8

Type: local

Family: Misc.

Published: 2015/11/23

Updated: 2018/07/09

Dependencies: 76770

Risk Information

Risk Factor: Medium

CVSS v2.0

Base Score: 5.5

Temporal Score: 4.1

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

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

CVSS v3.0

Base Score: 6.8

Temporal Score: 5.9

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

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

Vulnerability Information

CPE: cpe:/a:citrix:xenserver

Required KB Items: Host/XenServer/version, Host/local_checks_enabled

Exploit Available: false

Exploit Ease: No known exploits are available

Patch Publication Date: 2015/11/10

Vulnerability Publication Date: 2015/11/09

Reference Information

CVE: CVE-2015-5307, CVE-2015-8104

BID: 77524, 77528