Citrix XenServer Multiple Vulnerabilities (CTX200892)

medium Nessus Plugin ID 83163
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Synopsis

The remote host is missing a vendor-supplied security patch.

Description

The version of Citrix XenServer installed on the remote host is affected by multiple vulnerabilities :

- A flaw exists in the VGA emulator in QEMU that allows a local guest user to read host memory by setting the display to a high resolution. (CVE-2014-3615)

- A flaw exists in the set_pixel_format() function within ui/vnc.c in QEMU that allows a remote attacker, using a small bytes_per_pixel value, to cause a denial of service condition. (CVE-2014-7815)

- A heap-based buffer overflow flaw exists in the Cirrus VGA emulator that allows local guest users to execute arbitrary code via vectors related to blit regions.
(CVE-2014-8106)

Note that environments that contain only PV guests are not vulnerable to these issues.

Solution

Apply the relevant hotfix referenced in the vendor advisory.

See Also

https://support.citrix.com/article/CTX200892

Plugin Details

Severity: Medium

ID: 83163

File Name: citrix_xenserver_CTX200892.nasl

Version: 1.11

Type: local

Family: Misc.

Published: 4/30/2015

Updated: 11/22/2019

Dependencies: citrix_xenserver_version.nbin

Risk Information

CVSS Score Source: CVE-2014-8106

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: Medium

Base Score: 4.6

Temporal Score: 3.4

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

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

CVSS v3

Risk Factor: Medium

Base Score: 5.3

Temporal Score: 4.6

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

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: 4/14/2015

Vulnerability Publication Date: 9/4/2014

Reference Information

CVE: CVE-2014-3615, CVE-2014-7815, CVE-2014-8106

BID: 69654, 70998, 71477