Vulnerabilities > CVE-2016-5302 - Improper Access Control vulnerability in Citrix Xenserver
Attack vector
NETWORK Attack complexity
LOW Privileges required
NONE Confidentiality impact
HIGH Integrity impact
HIGH Availability impact
HIGH Summary
Citrix XenServer 7.0 before Hotfix XS70E003, when a deployment has been upgraded from an earlier release, might allow remote attackers on the management network to "compromise" a host by leveraging credentials for an Active Directory account.
Vulnerable Configurations
| Part | Description | Count |
|---|---|---|
| Application | 18 |
Common Weakness Enumeration (CWE)
Common Attack Pattern Enumeration and Classification (CAPEC)
- Embedding Scripts within Scripts An attack of this type exploits a programs' vulnerabilities that are brought on by allowing remote hosts to execute scripts. The attacker leverages this capability to execute scripts to execute his/her own script by embedding it within other scripts that the target software is likely to execute. The attacker must have the ability to inject script into script that is likely to be executed. If this is done, then the attacker can potentially launch a variety of probes and attacks against the web server's local environment, in many cases the so-called DMZ, back end resources the web server can communicate with, and other hosts. With the proliferation of intermediaries, such as Web App Firewalls, network devices, and even printers having JVMs and Web servers, there are many locales where an attacker can inject malicious scripts. Since this attack pattern defines scripts within scripts, there are likely privileges to execute said attack on the host. Of course, these attacks are not solely limited to the server side, client side scripts like Ajax and client side JavaScript can contain malicious scripts as well. In general all that is required is for there to be sufficient privileges to execute a script, but not protected against writing.
- Signature Spoofing by Key Theft An attacker obtains an authoritative or reputable signer's private signature key by theft and then uses this key to forge signatures from the original signer to mislead a victim into performing actions that benefit the attacker.
Nessus
| NASL family | Misc. |
| NASL id | CITRIX_XENSERVER_CTX213549.NASL |
| description | The version of Citrix XenServer running on the remote host is 7.x prior to 7.0 hotfix XS70E003. It is, therefore, affected by a security bypass vulnerability due to incorrect handling of Active Directory (AD) credentials. An unauthenticated, remote attacker on the management network with AD credentials for an AD account can exploit this to compromise the XenServer host even if the credentials do not have authorization. |
| last seen | 2020-06-01 |
| modified | 2020-06-02 |
| plugin id | 91885 |
| published | 2016-06-28 |
| reporter | This script is Copyright (C) 2016-2019 and is owned by Tenable, Inc. or an Affiliate thereof. |
| source | https://www.tenable.com/plugins/nessus/91885 |
| title | Citrix XenServer Active Directory Authentication Incorrect Host Management Security Bypass (CTX213549, CTX213769) |
| code | |