Hi,

On 10.01.2018 11:12, Christian Reiter wrote:
> Does anybody know if this is a local problem which I can solve or if there is 
> anything else which I can do?

unfortunately some Firefox versions tend to leave registry entries
behind causing such false detection. We did a few tests on this and
could confirm your observations:

A base install of Firefox 56.0 in 32-bit will be upgraded first to 57.0
including a migration to a 64-bit version of Firefox. After a restart a
new update to 57.0.4 will be offered and a second restart is required.
As a result the following registry key wasn't deleted by the upgrade /
migration routine:

HKLM\SOFTWARE\Wow6432Node\mozilla.org\Mozilla -> CurrentVersion -> 56.0

causing a detection of Firefox 57.0.4 AND 56.0.

On the other hand a base install of Firefox 56.0.2 in 32-bit will be
upgraded directly to 57.0.4 including a migration to a 64-bit version of
Firefox. In this case the upgrade / migration routine is removing the
old registry entry correctly and only Firefox 57.0.4 is detected.

Unfortunately there is not that much we can do from NVT side if a
software is behaving inconsistently like this and you would need to
clean up the left-over registry keys from the registry.

Regards,

-- 

Christian Fischer | PGP Key: 0x54F3CE5B76C597AD
Greenbone Networks GmbH | http://greenbone.net
Neumarkt 12, 49074 Osnabrück, Germany | AG Osnabrück, HR B 202460
Geschäftsführer: Lukas Grunwald, Dr. Jan-Oliver Wagner
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