Citrix XenServer Multiple Vulnerabilities (CTX220771)

critical Nessus Plugin ID 97525

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.

See Also

https://support.citrix.com/article/CTX220771

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

Risk Information

VPR

Risk Factor: High

Score: 7.3

CVSS v2

Risk Factor: High

Base Score: 9

Temporal Score: 6.7

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

Temporal Vector: E:U/RL:OF/RC: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: 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