I searched in phabricator, if we've a task already, but couldn't find any. 
However, as the phabricator search and me aren't really good friends, it's 
possible, that the search wasn't as honest to me, as I would wish and I missed 
something, so I ask on this list :) Do we've a task already to track the work 
on this topic? A short github search[1] showed some usages of sha1 (at least 
the string), so I suspect, that there're some places where we use it, right?

[1] https://github.com/wikimedia/mediawiki/search?utf8=%E2%9C%93&q=SHA1

Best,
Florian

-----Ursprüngliche Nachricht-----
Von: Wikitech-l [mailto:[email protected]] Im Auftrag von 
Brion Vibber
Gesendet: Freitag, 24. Februar 2017 18:57
An: Wikimedia-tech list <[email protected]>
Betreff: [Wikitech-l] SHA-1 hash officially broken

Google security have announced that they have a working collision attack 
against the SHA-1 hash:

https://security.googleblog.com/2017/02/announcing-first-sha1-collision.html

It's highly recommended to move to sha-256 where doable.

Note that MediaWiki uses sha-1 in a number of places; in some such as revision 
hashes it's advisory for tools only, but in other places like deleted files 
(filearchive table) we use it for addressing, and should consider steps to 
mitigate attacks swapping in alternate files during deletion/undeletion.

-- brion
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