Vulnerabilities > CVE-2016-4810 - Improper Access Control vulnerability in Citrix Xenapp and Xendesktop
Attack vector
NETWORK Attack complexity
LOW Privileges required
NONE Confidentiality impact
NONE Integrity impact
HIGH Availability impact
NONE Summary
Citrix Studio before 7.6.1000, Citrix XenDesktop 7.x before 7.6 LTSR Cumulative Update 1 (CU1), and Citrix XenApp 7.5 and 7.6 allow attackers to set Access Policy rules on the XenDesktop Delivery Controller via unspecified vectors.
Vulnerable Configurations
| Part | Description | Count |
|---|---|---|
| Application | 10 |
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_STUDIO_CTX213045.NASL |
| description | The version of Citrix Studio, bundled with Citrix XenApp or XenDesktop, is prior to 7.6.1000. It is, therefore, affected by an unspecified security bypass vulnerability. An unauthenticated, remote attacker can exploit this to set Access Policy rules on the XenDesktop Delivery Controller, resulting in an insecure Access Policy configuration. |
| last seen | 2020-06-01 |
| modified | 2020-06-02 |
| plugin id | 92038 |
| published | 2016-07-13 |
| 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/92038 |
| title | Citrix Studio < 7.6.1000 Insecure Access Policy Configuration (CTX213045) |
| code | |