Yes, keep an eye out for announcements about other software that might be
more seriously affected.
For instance Subversion source control has some problems which can cause
checksum errors when operating on a source tree that has had the malicious
pairs of files committed into to it:
My initial look at potential attacks on MediaWiki is that our case is less
severe; if conflicting files are uploaded they may trigger false
equivalency warnings (with each other only), and can overwrite each other
(but not other files) when deleted/undeleted. No errors would be thrown or
general data corruption would occur.
-- brion
On Fri, Feb 24, 2017 at 1:27 PM, Pine W <wiki.pine(a)gmail.com> wrote:
As someone who runs a non-WMF MediaWiki installation
and might set up at
least one more, it's something that I want to know about. :) More info at
https://phabricator.wikimedia.org/T158986, although if I understand the
conversation on the Phabricator task correctly, the consensus is that
migration off of SHA-1 for MediaWiki software is important but doesn't need
to happen overnight because the attack is difficult to execute; however,
possible attacks on other software that still runs SHA-1 should be
considered. Is that correct, Brian?
Pine
On Fri, Feb 24, 2017 at 1:01 PM, Brian Wolff <bawolff(a)gmail.com> wrote:
Before anyone panics, this is not something that
people who run mediawiki
wikis have to worry about.
--
Brian
On Friday, February 24, 2017, Pine W <wiki.pine(a)gmail.com> wrote:
> Forwarding info that may be of interest.
>
> Pine
>
>
> ---------- Forwarded message ----------
> From: Brion Vibber <bvibber(a)wikimedia.org>
> Date: Fri, Feb 24, 2017 at 9:56 AM
> Subject: [Wikitech-l] SHA-1 hash officially broken
> To: Wikimedia-tech list <wikitech-l(a)lists.wikimedia.org>
>
>
> 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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