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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, firstname.lastname@example.org and Graham Murphy, email@example.com 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
The CAPTCHA component for ASP.NET provided by Lanap may be completely bypassed, thus undermining the security benefit of the CAPTCHA technology.
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.
The above vulnerability has been fixed in the latest release of the product, BotDetect ASP.NET CAPTCHA 126.96.36.199. 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.
Upgrade to the latest release of the product, BotDetect ASP.NET CAPTCHA 188.8.131.52.
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.
For questions about this advisory, or to report an error: firstname.lastname@example.org
For details on Symantec's Vulnerability Reporting Policy: http://www.symantec.com/research/Symantec-Responsible-Disclosure.pdf
Symantec Vulnerability Research Advisory Archive: http://www.symantec.com/research/
Symantec Vulnerability Research GPG Key: http://www.symantec.com/research/Symantec_Vulnerability_Research_GPG.asc
To Report a Security Vulnerability in a Symantec Product: email@example.com
For general information on Symantec's Product Vulnerability reporting and response: http://www.symantec.com/security/
Symantec Product Advisory Archive: http://www.symantec.com/avcenter/security/SymantecAdvisories.html
Symantec Product Advisory PGP Key: http://www.symantec.com/security/Symantec-Vulnerability-Management-Key.asc
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 this alert in any medium other than electronically requires permission from firstname.lastname@example.org.
Disclaimer The information in the advisory is believed to be accurate at the time of publishing based on currently available information. Use of the information constitutes acceptance for use in an AS IS condition. There are no warranties with regard to this information. Neither the author nor the publisher accepts any liability for any direct, indirect, or consequential loss or damage arising from use of, or reliance on, this information.
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