Citrix XenServer Multiple Vulnerabilities (CTX220771)

critical Nessus Plugin ID 97525

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Synopsis

The remote host is affected by multiple vulnerabilities.

Description

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

- A flaw exists in the blit_region_is_unsafe() function within file hw/display/cirrus_vga.c when handling a backward mode bitblt copy. A guest attacker with administrative privileges can exploit this to crash the QEMU process or potentially execute arbitrary code with elevated privileges. (CVE-2017-2615)

- A flaw exists in the cirrus_bitblt_cputovideo() function within file hw/display/cirrus_vga.c when running in CIRRUS_BLTMODE_MEMSYSSRC mode due to improper memory region checks. A guest attacker with administrative privileges can exploit this to crash the QEMU process or potentially execute arbitrary code with elevated privileges. (CVE-2017-2620)

Solution

Apply the appropriate hotfix according to the vendor advisory.

Plugin Details

Severity: Critical

ID: 97525

File Name: citrix_xenserver_CTX220771.nasl

Version: 1.7

Type: local

Family: Misc.

Published: 3/3/2017

Updated: 6/3/2021

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: High

Score: 7.3

CVSS v2

Risk Factor: High

Base Score: 9

Temporal Score: 6.7

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

CVSS Score Source: CVE-2017-2620

CVSS v3

Risk Factor: Critical

Base Score: 9.9

Temporal Score: 8.6

Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/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 Ease: No known exploits are available

Patch Publication Date: 2/21/2017

Vulnerability Publication Date: 1/24/2017

Reference Information

CVE: CVE-2017-2615, CVE-2017-2620

BID: 95990, 96378

IAVB: 2017-B-0024-S

Detections

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