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Assigned : VUPEN/ADV-2006-2518
From : research at symantec.com
Subject : SYMSA-2006-005
Date : 2006-06-24
Original Message
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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@symantec.com and
Graham Murphy, graham_murphy@symantec.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
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
- - - - -------Symantec Vulnerability Research Advisory Information-------
For questions about this advisory, or to report an error:
research@symantec.com
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
- - - - -------------Symantec Product Advisory Information-------------
To Report a Security Vulnerability in a Symantec Product:
secure@symantec.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 cs_advisories@symantec.com.
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.
Symantec, Symantec products, and Symantec Consulting Services
are registered trademarks of Symantec Corp. and/or affiliated
companies in the United States and other countries. All other
registered and unregistered trademarks represented in this
document are the sole property of their respective
companies/owners.
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