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Date: Wed, 12 Jun 2013 09:34:16 -0400
From: Andrew Nacin <>
Cc: security <>,
Subject: Re: CVE request: WordPress 3.5.1 denial of service vulnerability

On Jun 12, 2013 9:11 AM, "Solar Designer" <> wrote:
> Web apps (like WordPress) were indeed not supposed to expose the ability
> for untrusted users to specify arbitrary "setting" strings (which
> include the configurable cost).  I am unfamiliar with WordPress, so I
> don't know why they do it here - is this instance of their use of phpass
> perhaps meant to achieve similar goals that tripcodes do?  If so, yes,
> they should be sanitizing the cost setting (perhaps with a site admin
> configurable upper bound).

We agree.

> However, for password hashes coming from
> WordPress user/password database (primary intended use of phpass), this
> should not be necessary.  (Indeed, a similar DoS attack could be
> performed by someone having gained write access to the database, but
> that would likely be the least of a site admin's worries.)

Correct (and yes).

Andrew Nacin

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