SYMSA-2006-005

[research@xxxxxxxxxxxx]

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Symantec Vulnerability Research

http://www.symantec.com/research
Security Advisory

Advisory ID   : SYMSA-2006-005
Advisory Title: Lanap CAPTCHA bypass exposure
Author        : Michael White, michael_white@xxxxxxxxxxxx and
                Graham Murphy, graham_murphy@xxxxxxxxxxxx
Release Date  : 23-06-2006
Application   : BotDetect Lanap CAPTCHA component
Platform      : ASP.NET
Severity      : Low/Limited exposure
Vendor status : Vendor verified, patch available
CVE Number    : CVE-2006-2918
Reference     : http://www.securityfocus.com/bid/18315


Overview:

        The CAPTCHA component for ASP.NET provided by Lanap may be
        completely bypassed, thus undermining the security benefit
        of the CAPTCHA technology.


Details:

        During a consulting engagement, Symantec identified that the
        Lanap CAPTCHA component stores the UUID and hash for a given
        CAPTCHA within the page ViewState. By replaying the ViewState
        for a known number, a remote attacker may avoid the CAPTCHA
        entirely.

        This behaviour is dependent on the way in which the Lanap
        component is integrated, however numerous examples including
        Lanap's demo code are identified as exhibiting this behaviour.


Vendor Response:

        The above vulnerability has been fixed in the latest release
        of the product, BotDetect ASP.NET CAPTCHA 1.5.4.0.

        Licensed and evaluation versions of Lanap BotDetect ASP.NET
        CAPTCHA are available for customer download from the Lanap
        website at http://www.lanapsoft.com

        If there are any further questions about this statement, please
        contact Lanap support.

Recommendation:

        Upgrade to the latest release of the product,
        BotDetect ASP.NET CAPTCHA 1.5.4.0.


Common Vulnerabilities and Exposures (CVE) Information:

The Common Vulnerabilities and Exposures (CVE) project has assigned
the following names to these issues.  These are candidates for
inclusion in the CVE list (http://cve.mitre.org), which standardizes
names for security problems.


  CVE-2006-2918

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Copyright (c) 2006 by Symantec Corp.
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