Citrix XenServer Multiple Vulnerabilities (CTX200288)

High Nessus Plugin ID 79745

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VPR Score: 6

Synopsis

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

Description

The remote host is running a version of Citrix XenServer that is affected by multiple vulnerabilities :

- A local privilege escalation vulnerability exists due to improperly restricted access to 'PHYSDEVOP_{prepare,release}_msix' operations by unprivileged guests. An attacker with access to a guest operating system can exploit this issue to gain elevated privileges on affected computers. (CVE-2014-1666)

- A local privilege escalation vulnerability exists due to missing privilege level checks in x86 emulation of far branches. This flaw exists in the CALL, JMP, and RETF instructions in the Intel assembly syntax, and the LCALL, LJMP, and LRET instructions in the AT&T syntax.
An attacker with access to a guest operating system can exploit this issue to gain elevated privileges on affected computers. (CVE-2014-8595)

- A denial of service vulnerability exists due to a failure to restrict access to the hypercall argument translation feature. An attacker with access to a guest operating system can crash the host with excessive checks on the final register state for 32-bit guests running on a 64-bit hypervisor. (CVE-2014-8866)

- A denial of service vulnerability exists due to insufficient bounding of 'REP MOVS' to MMIO emulated inside of the hypervisor. This flaw affects the 'hvm_mmio_intercept()' function in 'intercept.c'. An attacker with access to a guest operating system can exploit this issue to crash the host.
(CVE-2014-8867)

Solution

Apply the relevant hotfix referenced in the vendor advisory.

See Also

https://support.citrix.com/article/CTX200288

Plugin Details

Severity: High

ID: 79745

File Name: citrix_xenserver_CTX200288.nasl

Version: 1.7

Type: local

Family: Misc.

Published: 2014/12/05

Updated: 2019/11/25

Dependencies: 76770

Risk Information

Risk Factor: High

VPR Score: 6

CVSS Score Source: CVE-2014-1666

CVSS v2.0

Base Score: 8.3

Temporal Score: 6.1

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

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

CVSS v3.0

Base Score: 9

Temporal Score: 7.8

Vector: CVSS:3.0/AV:A/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 Available: false

Exploit Ease: No known exploits are available

Patch Publication Date: 2014/11/18

Vulnerability Publication Date: 2014/11/18

Reference Information

CVE: CVE-2014-1666, CVE-2014-8595, CVE-2014-8866, CVE-2014-8867

BID: 65125, 71151, 71331, 71332