Detection logic issue

With a recent change on 2018-11-19 [1] to improve the privacy handling of our endpoint products we created an issue in which under certain circumstances false negatives could occur. The issue was promptly discovered by F-Secure researchers. We have published an update on 2018-11-23 [2] that resolves the issue.

 

Note: The issue would only affect customers who opted out of F-Secure’s security cloud in their privacy settings. The default is to be opted in.

 

A fix for all affected F-Secure products was made available on 2018-11-23. It was rolled out via our automated update process, so no action from end users is required to fix the issue unless they have explicitly turned off the automatic updates.

 

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Customers with affected products can check that they have received the latest updates of 2018-11-23 or later.

 

Affected products:

 

  • F-Secure Antivirus 17.x
  • F-Secure Internet Security 17.x
  • F-Secure SAFE 17.x
  • F-Secure SENSE 17.x
  • All operator products with above versions
  • F-Secure Client Security 13 and 14
  • F-Secure Computer Protection

 

Not affected:

  • F-Secure Client Security 12 or earlier
  • All F-Secure Linux products
  • All F-Secure Mac products
  • All F-Secure Android products
  • All F-Secure server products

 

Incorrect malware handling logic of executable files was possible if customer had opted-out from allow deeper analysis of non-personalized data. Even with this setting turned off, incorrect logic was not applied to all executable files. Commonly known executables did not trigger the incorrect logic – incorrect logic was only applied to smaller amount of previously unknown executables. For affected customers, the problem was mitigated by the multiple protection layers in the product.

 

[1] F-Secure Ultralight Core Update 2018-11-19_01

[2] F-Secure Lynx win64 Update 2018-11-23_01

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