Citrix XenServer Multiple Vulnerabilities (CTX200288)

This script is Copyright (C) 2014-2017 Tenable Network Security, Inc.


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)

See also :

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

Solution :

Apply the relevant hotfix referenced in the vendor advisory.

Risk factor :

High / CVSS Base Score : 7.7
(CVSS2#AV:A/AC:L/Au:S/C:C/I:C/A:C)
CVSS Temporal Score : 5.7
(CVSS2#E:U/RL:OF/RC:C)
Public Exploit Available : false

Family: Misc.

Nessus Plugin ID: 79745 ()

Bugtraq ID: 65125
71151
71331
71332

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

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