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Security Advisories Relating to Symantec Products - Symantec VIP Access Desktop Arbitrary DLL Execution


December 8, 2016

Overview | Issues | Affected Products | Mitigation | Best Practices | Acknowledgements | Revisions




Symantec has released an update to address a finding in VIP Access Desktop that could allow a local user to force VIP Access Desktop UI Manager to execute an arbitrary formatted DLL with logged-on user privileges.


Highest severity issue: Low
Number of issues: 1


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This update applies to the following issues:




Symantec VIP Access Desktop Arbitrary DLL execution




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Symantec has verified the issue and addressed it in a product update as indicated below.


Symantec Product(s)

The following Symantec products are affected.



Symantec VIP Access Desktop versions prior to 2.2.2

Upgrade to VIP Access Desktop 2.2.3 or later


The following Symantec products are NOT Affected.



Symantec VIP Access for Mobile

Not Affected


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Symantec VIP Access Desktop Arbitrary DLL execution


BID: 94731

Severity: Low (CVSSv3: 3.9) AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N

Impact: Code execution

Exploitation: None

Date patched: Click to pick a date

VIP Access Desktop UI Manager invokes DLLs from the current working folder during startup. A malicious local user can create specifically modified DLLs to replace the normal product DLLs required during startup. Then, by redirecting the startup path of the VIP Access Desktop UI Manager the user can cause the VIP Access Desktop UI Manager to invoke the substituted DLL instead of the required product DLL. Any specifically modified code execution could be performed with logged-on user privileges, which is normally user-level access in currently supported operating systems. Ultimately, this problem is caused by a failure to properly validate required product DLLs during start-up. This could result in a local user being able to manipulate VIP Access Desktop to load and execute an arbitrary DLL of the user’s choice with user-level privileges.



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Symantec VIP Access Desktop has been updated to address this issue by implementing stricter access controls on authorized product-specific DLLs. Symantec VIP Access Desktop users should update to version 2.2.3, which is currently available for download from the VIP ID Center portal, https://idprotect.vip.symantec.com/desktop/download.v.


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Symantec recommends the following measures to reduce risk of attack:

  • Restrict access to administrative or management systems to authorized privileged users.
  • Restrict remote access to trusted/authorized systems only.
  • Run under the principle of least privilege, where possible, to limit the impact of potential exploit.
  • Keep all operating systems and applications current with vendor patches.
  • Follow a multi-layered approach to security. At a minimum, run both firewall and anti-malware applications to provide multiple points of detection and protection to both inbound and outbound threats.
  • Deploy network and host-based intrusion detection systems to monitor network traffic for signs of anomalous or suspicious activity. This may aid in the detection of attacks or malicious activity related to the exploitation of latent vulnerabilities.


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  • John Page aka hyp3rlinx (CVE-2016-6593)



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  • None



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Symantec takes the security and proper functionality of our products very seriously. As founding members of the Organization for Internet Safety (OISafety), Symantec supports and follows responsible disclosure guidelines.
Symantec has developed a Software Security Vulnerability Management Process document outlining the process we follow in addressing suspected vulnerabilities in our products.
Symantec Corporation firmly believes in a proactive approach to secure software development and implements security review into various stages of the software development process. Additionally, Symantec is committed to the security of its products and services as well as to its customers’ data. Symantec is committed to continually improving its software security process.
This document provides an overview of the current Secure Development Lifecycle (SDLC) practice applicable to Symantec’s product and service teams as well as other software security related activities and policies used by such teams. This document is intended as a summary and does not represent a comprehensive list of security testing and practices conducted by Symantec in the software development process.
Please contact secure@symantec.com if you believe you have discovered a security issue in a Symantec product. A member of the Symantec Software Security team will contact you regarding your submission to coordinate any required response. Symantec strongly recommends using encrypted email for reporting vulnerability information to secure@symantec.com.
The Symantec Software Security PGP key can be found at the following location:
Permission to redistribute this alert electronically is granted as long as it is not edited in any way unless authorized by Symantec Software Security. Reprinting the whole or part of this alert in any medium other than electronically requires permission from secure@symantec.com.
Last modified on: December 8, 2016
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