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Date: Mon, 1 Oct 2018 08:50:10 -0400
From: Alex Gaynor <>
Cc: Carlton Gibson <>
Subject: Re: Django security release issued: 2.1.2

FWIW, Django's default new-project template includes a password validator
that denies the ability to use 20,000 common passwords:

-- This will not be true for older projects with that upgraded
Django versions, but did explicitly set PASSWORD_VALIDATORS, so that's a
thing people should do :-)


On Mon, Oct 1, 2018 at 8:47 AM Solar Designer <> wrote:

> On Mon, Oct 01, 2018 at 11:33:47AM +0200, Carlton Gibson wrote:
> > Today the Django team issued 2.1.2 as part of our security
> > process. This release address a security issue, and we encourage all
> > users to upgrade as soon as possible:
> >
> >
> First of all, thank you for sharing this with oss-security.
> Per oss-security list content guidelines, actual vulnerability detail
> must be included in postings (message body or text/plain attachment).
> The Subject could have easily been more descriptive for this list, too -
> e.g., "CVE-2018-16984: Django: Password hash disclosure to "view only"
> admin users".
> Carlton, I'd appreciate it if you include such detail in your
> oss-security postings (if any) on future occasions.  Including the links
> as well is great (such as for easy access to updated revisions while
> the links work); including only links is discouraged.
> Here's the vulnerability detail from the above URL:
> ---
> CVE-2018-16984: Password hash disclosure to "view only" admin users
> If an admin user has the change permission to the user model, only part
> of the password hash is displayed in the change form. Admin users with
> the view (but not change) permission to the user model were displayed
> the entire hash. While it's typically infeasible to reverse a strong
> password hash, if your site uses weaker password hashing algorithms such
> as MD5 or SHA1, it could be a problem.
> Thanks Phithon Gong for reporting this issue.
> ---
> BTW, the feasibility of "reversing" a password hash depends not only on
> hash type, but also on how many guesses the attacker would need to make
> before likely hitting the right password.  Without target user specific
> information, that number depends on how common or not the password is.
> Maybe the word "typically" allows for this exception for weak passwords.
> However, unnecessarily revealing the password hash is a problem on its
> own, not just "could be a problem" depending on hash type, although the
> restriction to "admin users" and password hashing do mitigate the issue
> to some extent.
> Thanks,
> Alexander

All that is necessary for evil to succeed is for good people to do nothing.

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