"Lists" <li...@senseofsecurity.com> wrote:

>Sense of Security - Security Advisory - SOS-11-007
>Release Date.               20-May-2011
>Last Update.                -
>Vendor Notification Date.   04-Apr-2011
>Product.                    Securimage / PHPCaptcha
>Platform.                   PHP
>Affected versions.          1.0.4 - 2.0.2
>Severity Rating.            Medium
>Impact.                     Authentication bypass
>Attack Vector.             Remote without authentication
>Solution Status.            Vendor workaround
>                            (remove securimage_play.php)
>CVE reference.             Not yet assigned
>PHPCaptcha, also known as Securimage, is a popular Open Source PHP
>CAPTCHA library. It is also used in popular WordPress plugins such as
>the 'Fast Secure Contact Form'. Insufficient distortion in the audio
>version of the CAPTCHA allows an attacker to quickly decode the CAPTCHA
>by performing basic binary analysis of the generated audio file. The
>issue is compounded by the fact that even if the audio feature of the
>CAPTCHA has been disabled, it can still be accessed by forceful
>browsing to the /secure_play.php URI.
>Proof of Concept.
>Proof of concept code that works against the example_form.php page and
>the MP3 file format provided with the standard PHPCaptcha package
>available from www.phpcaptcha.org is available at:
>Proof of concept code is only available for the MP3 version of the
>audio, however the WAV audio format is also affected by the same
>Remove the script securimage_play.php and disable the use of the Audio
>Discovered by.
>Phil Taylor from Sense of Security Labs.
>About us.
>Sense of Security is a leading provider of information security and
>risk management solutions. Our team has expert skills in assessment
>and assurance, strategy and architecture, and deployment through to
>ongoing management. We are Australia's premier application penetration
>testing firm and trusted IT security advisor to many of the country's
>largest organisations.
>Sense of Security Pty Ltd
>Level 8, 66 King St
>Sydney NSW 2000
>T: +61 (0)2 9290 4444
>F: +61 (0)2 9290 4455
>W: http://www.senseofsecurity.com.au
>E: i...@senseofsecurity.com.au
>Twitter: @ITsecurityAU
>The latest version of this advisory can be found at:
>Other Sense of Security advisories can be found at:
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If you have to remove the audio part, you might as well remove the whole thing. 
It would prevent any blind or hard of seeing user from accessing said sites.

Sent from my Android phone with K-9 Mail. Please excuse my brevity.

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