lvarela-r7 (13)

Last Login: February 05, 2021
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Firefox version 83 fixes this zero-day vulnerability. The bug could only be exploited if a rarely used, hidden preference is toggled. It only affects the Linux and Android operating systems. More details here: https://bugs.chromium.org/p/chromium/issues/detail?id=1139963

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Technical Analysis

Some of the gotchas on patching this vuln:

  • Not restarting the vulnerable asset, even after you apply the patch, keeps the asset vulnerable. Must restart.
  • There have been cases where even with the patch reported as being installed, files on disk were vulnerable, manually checking termdd.sys, the file is normally located at C:\Windows\System32\drivers and the version retrieved with this powershell command:

get-item -Path ‘C:\Windows\System32\drivers\termdd.sys’ | Format-List -Force