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Add Size Leaks #31

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manuelvsousa opened this issue Oct 2, 2020 · 2 comments
Open

Add Size Leaks #31

manuelvsousa opened this issue Oct 2, 2020 · 2 comments
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@manuelvsousa
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manuelvsousa commented Oct 2, 2020

Size Leaks are very important XS-Leaks. They are often addressed in the browser when researchers find exact ways to leak the size. Some mechanisms that still work:

Fixed, but relevant works (we should document them):

  • Flash Size Leaks. Flash is going to be removed by the end of the year Ref1, Ref2 (currently is under strict user permissions)
  • Attackers could abuse the way browsers use cache limits (Ref1 & Ref2) to predict the size of a resource using Cache API (Ref1 & Ref2). Browsers fixed this issue by adding random noise (Ref1-Chrome & Ref2-Firefox)
  • Video and Audio Parsing. This also involves CORB and CORP.
  • HEIST. I believe the fix was the same as the one in cache limits Ref1 & Ref2)
@manuelvsousa manuelvsousa added the new article Suggestion for a new article label Oct 2, 2020
@NDevTK
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NDevTK commented May 26, 2021

@manuelvsousa did "HEIST" get fixed it seems like window navigations should bypass "SameSite cookies" from w3c/resource-timing#64 (comment)
Considering the SharedArrayBuffer can be used to create a high precision clock whatwg/storage#31 may not be enough to prevent this. https://xsleaks.dev/docs/attacks/timing-attacks/network-timing/#unload-events

@NDevTK
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NDevTK commented Jun 20, 2021

Created #114 for compression attacks.

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