Norton Security for Mac does not verify certificates
Norton Security installer Bug
Improper Certificate Validation:
The Install Norton Security for Mac installer, versions prior to 7.6, fails to properly validate SSL certificates provided by HTTPS connections, which can allow an attacker to obtain a Man-in-Middle position.
An attacker with a Man-in-the-Middle position can spoof content retrieved using HTTPS.
Symantec has released an updated installer, version 7.6 to address the vulnerability.