[NT] Netegrity SiteMinder smpwservicescgi.exe Target Redirection

From: SecuriTeam (support_at_securiteam.com)
Date: 01/18/05

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Date: 18 Jan 2005 12:29:27 +0200

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      Netegrity SiteMinder smpwservicescgi.exe Target Redirection
    ------------------------------------------------------------------------

    SUMMARY

     <http://www.netegrity.com/products/products_SM_overview.cfm> Netegrity
    SiteMinder enables "companies to administer and consistently enforce user
    access to Web applications and by providing single sign-on (SSO) services
    to users".

    Due to improper filtering of user provided data, a remote attacker can
    cause the Netegrity SiteMinder's smpwservicescgi.exe CGI to redirect a
    user to a third party site, which in turn can be used in phishing attacks.

    DETAILS

    Netegrity's SiteMinder has a CGI called smpservicecgi.exe, which is used
    to authenticate a user prior to allowing him to access a restricted web
    page. One of this CGI's parameters allow the redirection of the user to a
    web site once the authentication process has been successful. This
    parameter however, does not check to which web site the user is
    redirected. This allows an attacker to redirect the user to whatever site
    he desires, while the user thinks this is the natural course of the logon
    process.

    Exploit:
    The following URL will illustrate the attack, once the user has
    successfully/unsuccessfully logged on he will be redirected to the
    http://www.google.com web site:
    http://vulnerable/siteminderagent/pwcgi/smpwservicescgi.exe?TARGET=http%3a%2f%2fwww%2google%2eccom

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:maru@scip.ch> Marc Ruef.
    The original article can be found at:
    <http://www.scip.ch/cgi-bin/smss/showadvf.pl?id=1022>
    http://www.scip.ch/cgi-bin/smss/showadvf.pl?id=1022

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