Lanap CAPTCHA bypass exposure

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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 (at) symantec (dot) com [email concealed] and

Graham Murphy, graham_murphy (at) symantec (dot) com [email concealed]

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

CAPTCHAare 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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at the time of publishing based on currently available information.

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