Vulnerabilities > CVE-2016-9111 - Improper Access Control vulnerability in Citrix Receiver Desktop 4.5

047910
CVSS 4.6 - MEDIUM
Attack vector
LOCAL
Attack complexity
LOW
Privileges required
NONE
Confidentiality impact
PARTIAL
Integrity impact
PARTIAL
Availability impact
PARTIAL
local
low complexity
citrix
CWE-284
exploit available

Summary

Incorrect access control mechanisms in Citrix Receiver Desktop Lock 4.5 allow an attacker to bypass the authentication requirement by leveraging physical access to a VDI for temporary disconnection of a LAN cable. NOTE: as of 20161208, the vendor could not reproduce the issue, stating "the researcher was unable to provide us with information that would allow us to confirm the behaviour and, despite extensive investigation on test deployments of supported products, we were unable to reproduce the behaviour as he described. The researcher has also, despite additional requests for information, ceased to respond to us."

Vulnerable Configurations

Part Description Count
Application
Citrix
1

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.

Exploit-Db

descriptionCitrix Receiver/Receiver Desktop Lock 4.5 - Authentication Bypass. CVE-2016-9111. Local exploit for Multiple platform
fileexploits/multiple/local/40686.txt
idEDB-ID:40686
last seen2016-11-02
modified2016-11-02
platformmultiple
port
published2016-11-02
reporterRithwik Jayasimha
sourcehttps://www.exploit-db.com/download/40686/
titleCitrix Receiver/Receiver Desktop Lock 4.5 - Authentication Bypass
typelocal

Packetstorm

data sourcehttps://packetstormsecurity.com/files/download/139493/citrixreceiver-bypass.txt
idPACKETSTORM:139493
last seen2016-12-05
published2016-11-02
reporterRithwik Jayasimha
sourcehttps://packetstormsecurity.com/files/139493/Citrix-Receiver-Receiver-Desktop-Lock-4.5-Authentication-Bypass.html
titleCitrix Receiver / Receiver Desktop Lock 4.5 Authentication Bypass