The remote Ubuntu 16.04 LTS / 18.04 LTS host has packages installed that are affected by a vulnerability as referenced in the USN-4140-1 advisory.

    It was discovered that no user notification was given when pointer lock is enabled. If a user were tricked     in to opening a specially crafted website, an attacker could potentially exploit this to hijack the mouse     pointer and confuse users.

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Detections

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Ubuntu 16.04 LTS / 18.04 LTS : Firefox vulnerability (USN-4140-1)

medium Nessus Plugin ID 129385

Version 1.8