Re: Vulnerability in CB Captcha for Joomla and Mambo
Dear Susan:
Respectfully, why did you subscribe to Bugtraq? I subscribed to be
notified when a vulnerability was found with software that I am using.
Just saying.
Regards
On Apr 15, 2010, at 2:11 PM, Susan Bradley <sbradcpa@pacbell.net> wrote:
> Dear Bugtraq.
>
> I am an admin of a site that has Captcha that spam gets through and
> the CPU sucks.
>
> Honest question -- are you going to post about every site that has
> lousy captcha? Would it be faster if us admins that have lousy
> captcha just outted ourselves first?
>
> MustLive wrote:
>> Hello Bugtraq!
>>
>> I want to warn you about security vulnerability in plugin CB Captcha
>> (plug_cbcaptcha) for component Community Builder (com_comprofiler)
>> for
>> Joomla and Mambo. The posting of this advisory to mailing lists was
>> delayed,
>> because I found that there are two different vulnerable versions of
>> plugin
>> developed by different authors, so I needed to inform all authors.
>>
>> -----------------------------
>> Advisory: Vulnerability in CB Captcha for Joomla and Mambo
>> -----------------------------
>> URL: http://websecurity.com.ua/4087/
>> -----------------------------
>> Affected products: CB Captcha 1.0.2 and previous versions
>> (developed by
>> Kotofeich), CB Captcha 2.2 and previous versions (developed by Beat).
>> -----------------------------
>> Timeline:
>> 17.03.2010 - found vulnerability.
>> 31.03.2010 - disclosed at my site.
>> 01.04.2010 - informed developer of CB Captcha 1.x. And because I
>> found other
>> version of the plugin by another author, and after checking it
>> later I
>> informed author of CB Captcha 2.x.
>> 13.04.2010 - additionally informed developers of Community Builder
>> (both
>> joomlapolis.com and communitybuilder.ru).
>> -----------------------------
>> Details:
>>
>> This is Insufficient Anti-automation vulnerability.
>>
>> This plugin is based on captcha script CaptchaSecurityImages.php
>> and I
>> already reported about vulnerabilities in CaptchaSecurityImages
>> (http://websecurity.com.ua/4043/). And in plugin plug_cbcaptcha
>> were fixed
>> all Insufficient Anti-automation and Denial of Service
>> vulnerabilities from
>> original script, except one.
>>
>> Insufficient Anti-automation:
>>
>> In the plugin it's possible to bypass captcha with using of session
>> reusing
>> with constant captcha bypass method (http://websecurity.com.ua/
>> 1551/), which
>> was described in project Month of Bugs in Captchas. With using of
>> this
>> method it's possible to bypass protection by sending the same code of
>> captcha.
>>
>> It can be done at all pages where this plugin is used. In CB
>> Captcha 1.x
>> it's using at registration page, lost password form and lost email
>> form. In
>> CB Captcha 2.x, in addition to before-mentioned forms, it's using
>> at contact
>> form (in the presence of component CB Contact 1.1) and login form
>> (in the
>> presence of login module of CB 1.2).
>>
>> PoC:
>>
>> The PoC for this Insufficient Anti-automation vulnerability was
>> provided to
>> developers. Everyone who want can create such PoC from exploit
>> provided in
>> above-mentioned article from MoBiC project.
>>
>> Best wishes & regards,
>> MustLive
>> Administrator of Websecurity web site
>> http://websecurity.com.ua
>>
>>
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