Lanap BotDetect CAPTCHAs Can Be Bypassed By Remote Users
SecurityTracker Alert ID: 1016371|
SecurityTracker URL: http://securitytracker.com/id/1016371
(Links to External Site)
Date: Jun 24 2006
Host/resource access via network|
Fix Available: Yes Vendor Confirmed: Yes |
Version(s): BotDetect ASP.NET CAPTCHA component prior to 126.96.36.199|
A vulnerability was reported in Lanap BotDetect. The CAPTCHAs can be bypassed.|
A remote user can replay a previous ViewState parameter value to bypass the CAPTCHA entirely.
The specific impact depends on how the CAPTCHA component is integrated with the system.
Michael White and Graham Murphy of Symantec Research discovered this vulnerability.
A remote user can bypass the CAPTCHA.|
The vendor has issued a fixed version of the BotDetect ASP.NET CAPTCHA (188.8.131.52).|
Vendor URL: www.lanapsoft.com/ (Links to External Site)
|Underlying OS: Windows (Any)|
Source Message Contents
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Symantec Vulnerability Research
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
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 184.108.40.206.
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 220.127.116.11.
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.
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