Citrix XenServer multiple vulnerabilities (CTX222565)

High Nessus Plugin ID 99377

Synopsis

A server virtualization platform installed on the remote host is affected by multiple vulnerabilities.

Description

The version of Citrix XenServer installed on the remote host is missing a security hotfix. It is, therefore, affected by multiple vulnerabilities :

- A flaw exists when invoking the instruction emulator that is triggered during the handling of SYSCALL by single-stepping applications. A local attacker can exploit this to execute code with elevated privileges on the guest. (CVE-2016-10013)

- An out-of-array memory access error exists in the memory_exchange() function within file common/memory.c due to improper checking of XENMEM_exchange input. An attacker on a 64-bit PV guest VM who has administrative privileges can exploit this issue to access arbitrary system memory locations, which can then be potentially used for further compromising the host. (CVE-2017-7228)

- A memory leak issue exits due to improper cleanup being performed during guest destruction. An attacker on the guest can exploit this, by repeatedly rebooting, to exhaust memory on the host system, resulting in a denial of service condition.

Solution

Apply the appropriate hotfix according to the vendor advisory.

See Also

https://support.citrix.com/article/CTX222565

Plugin Details

Severity: High

ID: 99377

File Name: citrix_xenserver_CTX222565.nasl

Version: 1.9

Type: local

Family: Misc.

Published: 2017/04/14

Updated: 2019/01/02

Dependencies: 76770

Configuration: Enable paranoid mode

Risk Information

Risk Factor: High

CVSS v2.0

Base Score: 7.2

Temporal Score: 5.6

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

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

CVSS v3.0

Base Score: 8.2

Temporal Score: 7.4

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

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

Vulnerability Information

CPE: cpe:/a:citrix:xenserver

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 2017/04/05

Vulnerability Publication Date: 2016/12/19

Reference Information

CVE: CVE-2016-10013, CVE-2017-7228

BID: 94963, 97375