bugtraq - Re: [oss-security] KDE Paste Applet

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Date: Wed, 29 May 2013 11:58:49 -0600
From: Kurt Seifried <kseifried@...hat.com>
To: oss-security@...ts.openwall.com
CC: Michael Samuel <mik@...net.net>, bugtraq@...urityfocus.com
Subject: Re: [oss-security] KDE Paste Applet

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On 05/28/2013 05:16 AM, Michael Samuel wrote:
> The paste applet included with kdeplasma-addons allows you to define
> macros that will copy some generated data into the clipboard, using
> simple macros to define the source and format of the data.
> 
> The available macros include %{password(...)} which generates "random"
> passwords.
> 
> Here is the code that generates the passwords (from pastemacroexpander.cpp):
> 
>     QDateTime now = QDateTime::currentDateTime();
>     qsrand(now.toTime_t() / now.time().msec());
>     for (int i = 0; i < charCount; ++i) {
>         result += chars[qrand() % chars.count()];
>     }
> 
> Breaking passwords generated by this (for example from leaked password
> hashes) can be done extremely quickly, especially if a password expiry
> or other hint is stored with the password.
> 
> Workaround: You can change the macro you were using to a %{exec(...)}
> macro which calls a secure password generator.  Please select your
> replacement carefully.
> 
> I reported this to security@....org and created a launchpad ticket
> against the Ubuntu package on May 13, followed up with a proof of
> concept on the 17th, and have received no response at all from either.
>  Apologies if that was the wrong contact method.
> 
> Regards,
>   Michael

Nice find. Please use CVE-2013-2120 for this issue.


- -- 
Kurt Seifried Red Hat Security Response Team (SRT)
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