SYMSA-2006-005

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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, [email protected] and
Graham Murphy, [email protected]
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.
Permission to redistribute this alert electronically is granted
as long as it is not edited in any way unless authorized by
Symantec Consulting Services. Reprinting the whole or part of
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Disclaimer
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at the time of publishing based on currently available information.
Use of the information constitutes acceptance for use in an
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