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Security Advisories Relating to Symantec Products - Install Norton Security Certificate Spoof


November 21, 2017

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




Symantec has released an update to address one issue in the Install Norton Security (INS) product which occurs when downloading Norton for Mac.


Highest severity issue: Low
Number of issues: 1


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This update applies to the following issues:




Install Norton Security Cert Spoof



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



The following Symantec consumer product is affected.



Install Norton Security prior to v 7.6

Upgrade to Install Norton Security v 7.6


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Install Norton Security Certificate Spoofing


BID: 101796

Severity: Low (CVSSv3: 3.7) AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

Impact: Certificate Spoof

Exploitation: None

Date patched: November 20, 2017

The Install Norton Security (INS) product can be susceptible to a certificate spoofing vulnerability, which is a type of attack whereby a maliciously procured certificate binds the public key of an attacker to the domain name of the target. This may allow the attacker to spoof the target site or mount a man-in-the- middle attack. Note that this particular issue manifests when downloading the Norton for Mac product.



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This issue was validated by the product team engineers. An Install Norton Security (INS) update, version 7.6, has been released which addresses the aforementioned issue. To apply the fix, please uninstall the previous version of Install Norton Security and then download and install the updated version. Note that you can access the updated Install Norton Security at the following URL:


At this time, Symantec is not aware of any exploitations or adverse customer impact from these issues.


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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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  • CERT Coordination Center <cert@cert.org> (CVE-2017-15528)



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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: November 21, 2017
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