Detections
Analytics

Citrix XenServer Multiple memory_exchange() Hypercall Error Handling DoS (CTX203451)

medium Nessus Plugin ID 87373

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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 due to multiple flaws in the memory_exchange() function in memory.c that are triggered when handling hypercall XENMEM_exchange errors. A local attacker within a guest can exploit these flaws to cause a deadlock, resulting in a denial of service condition.

Solution

Apply the relevant hotfix referenced in the vendor advisory.

See Also

https://support.citrix.com/article/CTX203451

Plugin Details

Severity: Medium

ID: 87373

File Name: citrix_xenserver_CTX203451.nasl

Version: 1.7

Type: local

Family: Misc.

Published: 12/15/2015

Updated: 11/20/2019

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Medium

Base Score: 4.7

Temporal Score: 3.5

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

CVSS Score Source: CVE-2015-8340

CVSS v3

Risk Factor: Medium

Base Score: 6.2

Temporal Score: 5.4

Vector: CVSS:3.0/AV:A/AC:L/PR:H/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/local_checks_enabled, Host/XenServer/version

Exploit Ease: No known exploits are available

Patch Publication Date: 12/8/2015

Vulnerability Publication Date: 12/8/2015

Reference Information

CVE: CVE-2015-8339, CVE-2015-8340

BID: 79038