Citrix XenServer Multiple Vulnerabilities (CTX224740)

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


Synopsis :

A server virtualization platform installed on the remote host is
affected by multiple vulnerabilities.

Description :

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

- A flaw exists that causes grant table operations to fail
due to improper handling of reference counts. An
unauthenticated, remote attacker can exploit this to
have an unspecified impact. (VulnDB 159976)

- An information disclosure vulnerability exists due to
blkif responses leaking stack data. An unauthenticated,
remote attacker can exploit this to disclose potentially
sensitive information. (VulnDB 159977)

- A NULL pointer dereference flaw exists in the event
channel poll that allows an unauthenticated, remote
attacker to cause a denial of service condition.
(VulnDB 159978)

- A flaw exists in shadow emulation due to insufficient
reference counts. An unauthenticated, remote attacker
can exploit this to have an unspecified impact.
(VulnDB 159979)

- A race condition exists in the grant table unmap code
that allows an unauthenticated, remote attacker to have
an unspecified impact. (VulnDB 159980)

- An unspecified flaw exists in page transfers that allows
a local attacker on the PV guest to gain elevated
privileges. (VulnDB 159981)

- A flaw exists that is triggered by stale P2M mappings
due to insufficient error checking. An unauthenticated,
remote attacker can exploit this to have an unspecified
impact. (VulnDB 159982)

See also :

https://support.citrix.com/article/CTX224740

Solution :

Apply the appropriate hotfix according to the vendor advisory.

Risk factor :

Critical / CVSS Base Score : 10.0
(CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C)
CVSS Temporal Score : 7.4
(CVSS2#E:U/RL:OF/RC:C)
Public Exploit Available : false

Family: Misc.

Nessus Plugin ID: 101205 ()

Bugtraq ID:

CVE ID:

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