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marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

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Hector Martin

@marcan42

If it ain't broke, I'll fix it! I'm porting Linux to Apple Silicon Macs at @AsahiLinux. http://patreon.com/marcan  | http://github.com/sponsors/marcan 

Tokyo, Japan
marcan.st
Joined May 2009

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    1. Hector Martin‏ @marcan42 19 Jan 2019
      • Report Tweet
      • Report NetzDG Violation

      Well, regardless of exploitability, this attitude just destroyed any confidence I had in VLC's updater being secure. Seriously, WTF. https://trac.videolan.org/vlc/ticket/21737 …

      14 replies 24 retweets 87 likes
    2. Zer0xFF‏ @Zer0xFF 19 Jan 2019
      • Report Tweet
      • Report NetzDG Violation
      Replying to @marcan42

      There is a reddit post about this, Someone mentioned that the update is signed and checked against a harcoded value in VLC... They also mentioned something about http being cache able? Sounds to me they use the same method as apt for verification.

      1 reply 0 retweets 6 likes
    3. Hector Martin‏ @marcan42 19 Jan 2019
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      • Report NetzDG Violation
      Replying to @Zer0xFF

      Which isn't a particularly good one, because it's subject to downgrade attacks. HTTPS fixes that. Also apparently the key is 1024-bit dsa, which, like, what.

      1 reply 0 retweets 10 likes
    4. Anisse‏ @Aissn 19 Jan 2019
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      Replying to @marcan42 @Zer0xFF

      VLC updater forbids downgrades.

      2 replies 0 retweets 0 likes
    5. Hector Martin‏ @marcan42 19 Jan 2019
      • Report Tweet
      • Report NetzDG Violation
      Replying to @Aissn @Zer0xFF

      Does it do it securely? Even if it does (big if), nothing can forbid upgrades to a vulnerable-not-latest version. That is fixed by HTTPS.

      2 replies 0 retweets 3 likes
    6. VideoLAN‏Verified account @videolan 19 Jan 2019
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      Replying to @marcan42 @Aissn @Zer0xFF

      It is not fixed by HTTPS. It ALSO requires changes to the update mechanism to achieve this. Which requires the transition to a new update model, which is not simple.

      2 replies 0 retweets 2 likes
    7. Hector Martin‏ @marcan42 19 Jan 2019
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      Replying to @videolan @Aissn @Zer0xFF

      Of course it's fixed by HTTPS. If you use HTTPS, I can't serve any updates at all without compromising your server. I can only block the process altogether, which is not upgrade-to-vulnerable.

      2 replies 1 retweet 4 likes
    8. VideoLAN‏Verified account @videolan 19 Jan 2019
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      Replying to @marcan42 @Aissn @Zer0xFF

      No, it is not. It solves the update information being accurate, but not the full update issue.

      2 replies 0 retweets 0 likes
      Hector Martin‏ @marcan42 19 Jan 2019
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      Replying to @videolan @Aissn @Zer0xFF

      It fixes the exact two scenarios I mentioned, and generally speaking fixes all attack scenarios involving a basic network MITM on updates other than plain denial-of-updates (which is not fixable).

      10:46 AM - 19 Jan 2019
      • 1 Like
      • Just Zis Guy, You Know?
      0 replies 0 retweets 1 like

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