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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 22 Jan 2019
      • Report Tweet
      • Report NetzDG Violation

      Debian: "We don't need to use HTTPS, we sign our packages! Check out whydoesaptnotusehttps[.]com!" https://lists.debian.org/debian-security-announce/2019/msg00010.html … https://justi.cz/security/2019/01/22/apt-rce.html … Oops. *This* is why you use HTTPS. Defense in depth. Take note @videolan.

      10 replies 102 retweets 222 likes
    2. Sandino Araico  🇲🇽‏ @KBrown 22 Jan 2019
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      Replying to @marcan42 @daeken @videolan

      ¿Pues qué no revisan la integridad de un archivo corrupto para rechazarlo? Esto no tiene que ver con el uso de HTTP o HTTPS; los archivos que bajaste de la red siempre tienen que ser verificados antes que los uses. No sé si se trata de una nota alarmista o está todo mal explicado

      1 reply 0 retweets 0 likes
    3. Hector Martin‏ @marcan42 22 Jan 2019
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      Replying to @KBrown @daeken @videolan

      No leíste el artículo. Revisan la integridad, pero tienen un bug en su uso de HTTP que permite inyección de datos en un protocolo interno, y a su vez reemplazar los hashes. Al no usar HTTPS, este fallo permite a *cualquiera* con acceso a tu conexión tomar el control.

      1 reply 0 retweets 0 likes
    4. Sandino Araico  🇲🇽‏ @KBrown 22 Jan 2019
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      Replying to @marcan42 @daeken @videolan

      ¿Y la llave con la que van firmados no se usa? Porque aunque cambies los hashes y lo que quieras, la verificación de firma tendría que salir rechazada. Ahora que si alguien les está falsificando la firma, el problema no está en el protocolo HTTP sino en la llave con la que firman

      1 reply 0 retweets 0 likes
    5. Hector Martin‏ @marcan42 22 Jan 2019
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      Replying to @KBrown @daeken @videolan

      La llave firma los manifests y los manifests contienen los hashes de los archivos. La inyección de protocolo permite sustituir los hashes por unos propios falsos, que coinciden con los del manifest pero no son los hashes reales del archivo.

      2 replies 0 retweets 0 likes
    6. Hector Martin‏ @marcan42 22 Jan 2019
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      Replying to @marcan42 @KBrown and

      El diseño de la cadena de hashes es perfectamente razonable. El problema es un simple bug en la integración con el protocolo HTTP. Si lo prefieres imagina que fuera un buffer overflow que permite ejecución de código directamente sin tener nada que ver con los hashes.

      2 replies 0 retweets 0 likes
    7. Sandino Araico  🇲🇽‏ @KBrown 23 Jan 2019
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      Replying to @marcan42 @daeken @videolan

      Pues por lo visto no es razonable porque permite que te cambien los hashes y no te des cuenta. Por cierto, el protocolo HTTPS también es suceptible a MITM solo que no es tan trivial. En el ambiente corporativo es muy frecuente el uso de una CA propia que inyectan por todos lados.

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 23 Jan 2019
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      Replying to @KBrown @daeken @videolan

      Voy a dejar de contestar porque no es mi labor explicarte lo que claramente está explicado en el artículo. Si no quieres entenderlo, es cosa tuya. Es un bug en la implementación (no diseño) de apt y el uso de HTTP extiende está superficie de ataque a cualquiera con un MITM. Fin.

      11:56 PM - 23 Jan 2019
      1 reply 0 retweets 0 likes
        1. Sandino Araico  🇲🇽‏ @KBrown 24 Jan 2019
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          Replying to @marcan42 @daeken @videolan

          Esta última explicación sí me suena convincente. El uso de HTTP no es el problema; solo ayuda a extender la superficie de ataque. El problema está en un bug de apt, no en el uso de protocolos inseguros como HTTP o TCP/IP sobre tameme.

          0 replies 0 retweets 0 likes
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