Could downloading Tumblr videos damage/infect Mac?

Discussion in 'Mac Basics and Help' started by Rodercik, Feb 16, 2017.

  1. Rodercik, Feb 16, 2017
    Last edited: Feb 16, 2017

    Rodercik macrumors newbie

    Joined:
    Feb 16, 2017
    #1
    I have downloaded quite some Tumblr videos, both cat videos, funny clips, porn.
    I downloaded them manually, you can save them with right click and save-as with right method - no download program used.

    I have old external hard drive where I keep them, downloaded both in Mac and in Windows. After clean install (due to technical issues not malware), I was going to put my collection back to fresh Mac, but heard these videos could contain malicious code/trojans/malware?

    Haven't done it for a month now - likely never will again just in case - but it would be pity to delete them all so... do I have to for security reasons?

    My question is - how likely could videos downloaded from Tumblr be malicious?
    After all, it is one platform for many different blogs - cat videos, funny clips, porn - they are all uploaded to same server so how likely is they can be infected by
    a) uploader
    b) tumblr itself?
     
  2. keysofanxiety macrumors 604

    keysofanxiety

    Joined:
    Nov 23, 2011
  3. Rodercik thread starter macrumors newbie

    Joined:
    Feb 16, 2017
    #3
    So the ones I already have can be safely put back to fresh Mac? I was feeling sad at possibility to delete all of them. I'm not going to download any new ones anyways.
     
  4. keysofanxiety macrumors 604

    keysofanxiety

    Joined:
    Nov 23, 2011
    #4
    Yeah that's right, no need for concern.
     
  5. Rodercik thread starter macrumors newbie

    Joined:
    Feb 16, 2017
    #5
    Thank you so much for all the help! :D
     
  6. keysofanxiety macrumors 604

    keysofanxiety

    Joined:
    Nov 23, 2011
    #6
    No worries -- thanks for the laugh with your candid post! If you claimed to have only downloaded cat videos, we wouldn't have judged. ;)
     
  7. Rodercik thread starter macrumors newbie

    Joined:
    Feb 16, 2017
    #7
    I believe telling my doctor, either physical or Mac one, all of my depraved activities! :D
     
  8. KALLT macrumors 601

    Joined:
    Sep 23, 2008
    #8
    It is certainly possible that they contain malicious code. Any kind of file has to be interpreted by a program (like a media player) and if there are any vulnerabilities in such a program, then it is sometimes possible to craft a file specifically to exploit such a vulnerability.

    In practice, you will rarely encounter such files and Apple frequently addresses such vulnerabilities in OS and security updates.
     
  9. Rodercik thread starter macrumors newbie

    Joined:
    Feb 16, 2017
    #9
    Thank you!
    This reminds me, what about webm files? Is the likelihood of those having infections harmful for Mac exactly the same as with videos or images?
     
  10. KALLT macrumors 601

    Joined:
    Sep 23, 2008
    #10
    The risk is the same. macOS has no out-of-the-box support for WebM, but some third-party browsers do. The same applies to them: vulnerabilities can exist in the software that interprets, decodes and renders the WebM format. A maliciously crafted WebM file can exploit such a vulnerability.

    Here is an example of this, a vulnerability in the libvpx codec library that Chrome and Firefox use for decoding WebM: https://tools.cisco.com/security/center/viewAlert.x?alertId=40466.
     
  11. Rodercik thread starter macrumors newbie

    Joined:
    Feb 16, 2017
    #11
    And saving (and playing them in Mac with VLP Player) webm files from image boards possesses same amount of risk as saving image and gif files? Basically, no need to worry more about saved webm files than I worry about saved image files?

    (Webm files are still kind of new for me so I didn't know how to view them - more dangerous than images and videos or same)
     

Share This Page